Investment Income, Interest and Dividend [Abstract] Schedule of Investment Income, Reported Amounts, by Category [Table] Schedule of Investment Income, Reported Amounts, by Category [Table] Schedule of Investment Income, Reported Amounts, by Category [Axis] Schedule of Investment Income, Reported Amounts, by Category [Axis] Investment Income, Categories [Domain] Investment Income, Categories [Domain] Sponsored money market mutual funds [Member] Money Market Funds [Member] Investment income Schedule of Investment Income, Reported Amounts, by Category [Line Items] Dividends earned Investment Income, Dividend Statement of Financial Position [Abstract] Stockholders' equity Stockholders' Equity, Number of Shares, Par Value and Other Disclosures [Abstract] Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Preferred stock, shares authorized Preferred Stock, Shares Authorized Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Common stock, shares authorized Common Stock, Shares Authorized Common stock, shares issued Common Stock, Shares, Outstanding Income Tax Disclosure [Abstract] Schedule of components of income tax provision Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Schedule of effective income tax rate reconciliation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Schedule of deferred tax assets and liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Schedule of unrecognized tax benefits Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] Quarterly Financial Information Disclosure [Abstract] Supplementary quarterly financial data (unaudited) Quarterly Financial Information [Text Block] Selected Quarterly Financial Information [Abstract] Net revenues Revenues, Net of Interest Expense Net income Net Income (Loss) Attributable to Parent Basic earnings on common stock Earnings Per Share, Basic Diluted earnings on common stock Earnings Per Share, Diluted Share-based Arrangements with Employees and Nonemployees [Abstract] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] Stock-based compensation plan [Member] Stock Compensation Plan [Member] Employee Stock-Based Compensation Programs [Member] Employee Stock Based Compensation Programs [Member] Employee Stock-Based Compensation Programs Non-employee director [Member] Non Employee Director Grants [Member] Non-employee director grants Award Type [Axis] Award Type [Domain] Restricted shares and restricted stock units [Member] Restricted Stock And Restricted Stock Units [Member] Shares and stock units that an entity has not yet issued because the agreed-upon consideration, such as employee services, has not yet been received. Stock options [Member] Stock Options [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum [Member] Minimum [Member] Maximum [Member] Maximum [Member] Weighted Average [Member] Weighted Average [Member] Stock awards and options Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Graded vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Stockholder approved plans (plans) Stockholder approved plans for stock options The number of stockholder approved plans under which qualified incentive and nonqualified fixed stock options are granted. Shares available for future grant (shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Term Share Based Compensation Arrangement by Share Based Payment Award, Award Contractual Term Reflects the contractual term of the award from grant date to expiration date as specified in the award agreement. Weighted-average grant-date fair value per option awarded, including reload grants (in dollars per option) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Expected life assumption Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Expected volatility assumption Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Dividend yield assumption Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Risk-free interest rate assumption Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Fair Value Disclosures [Abstract] Fair value measurements table Fair Value, Assets Measured on Recurring Basis [Table Text Block] Interest Income (Expense), Net [Abstract] Investment income from debt securities Interest and Dividend Income, Securities, Available-for-sale Interest expense on customer deposits Interest Expense, Time Deposits Net revenue Interest Income (Expense), Net Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Rollforward of stock options Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] Rollforward of nonvested restricted shares and restricted stock units Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] Future stock-based compensation expense Schedule of Unrecognized Compensation Cost, Nonvested Awards [Table Text Block] Information about Receivables, Revenues, and Services [Abstract] Information about Receivables, Revenues, and Services Components of revenues from advisory services Components of Investment Advisory Fees [Text Block] Tabular disclosure of the components of revenue recognized in the period for schedule-based fees earned for management of mutual funds based on average daily net assets and other investment management and advisory fees earned on other client portfolios based on asset valuations. Components of assets under management Components of Assets Under Management [Text Block] Tabular disclosure of the components of average assets under management and period end assets under management. Assets under management represents the market value of assets an investment adviser manages on behalf of investors and is the basis for determining investment advisory fee revenue. Other Disclosures [Abstract] Other Disclosures [Abstract] Other disclosures Other Disclosures [Text Block] This text block contains the other disclosures not otherwise separately made but instead accumulated and presented in a single note to the financial statements. Cash and Cash Equivalents [Abstract] Cash equivalents Cash and Cash Equivalents Disclosure [Text Block] Information about receivables, revenues, and services Information About Receivables Revenues And Services Text Block This element is used to indicate facts reported for the continuing operations of a business entity including disclosure of receivables from sponsored mutual funds for both advisory fees and administrative services provided. This element also includes disclosure of the components of investment advisory fees and administrative fees earned as well as the components of average assets and period end assets under management. Fair value measurements Fair Value Disclosures [Text Block] Employee global long-term incentive plan [Member] Non-employee director [Member] Non Employee Director [Member] Non-employee director programs Employee Stock Purchase Plan [Member] Employee Stock Purchase Plan [Member] Employee stock purchase plan Schedule of Share-based Compensation Arrangements by Share-based Payment Award, Program [Axis] Schedule of Share-based Compensation Arrangements by Share-based Payment Award, Program [Axis] Pertinent data describing and reflecting disclosures pertaining to grants during the period in an equity-based compensation arrangement, by equity-based compensation program. Schedule of Share-based Compensation Arrangements by Share-based Payment Award, Program [Domain] Schedule Of Share Based Compensation Arrangements By Share Based Payment Award Program [Domain] Pertinent data describing and reflecting disclosures pertaining to grants during the period in an equity-based compensation arrangement, by equity-based compensation program. Semiannual [Member] Semiannual [Member] Semiannual Programs Reload [Member] Reload [Member] Reload Programs New hire [Member] New Hire [Member] New Hire Programs Stock option [Member] Restricted shares [Member] Restricted Stock [Member] Restricted stock units [Member] Restricted Stock Units (RSUs) [Member] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Compensation and related costs [Member] Compensation and related costs [Member] Compensation and related costs [Member] Award Subcategory [Axis] Award Subcategory [Axis] Information by award subcategory pertaining to equity-based compensation. Award Subcategory [Domain] Award Subcategory [Domain] [Domain] for Information by award subcategory pertaining to equity-based compensation. Performance-based [Member] Performance Shares [Member] Stock-based compensation Effect of special dividend Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Description and Terms Adjustment to options outstanding on the special dividend's ex-dividend date Share Based Compensation Arrangement By Share Based Payment Award Plan Modification Incremental Options Outstanding The increase in options outstanding due to a modification of all oustandiing options. The modification occured on the ex-dividend date as a result of a special dividend. Incremental compensation expense (dollars) Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Incremental Compensation Cost Shares of unissued common stock authorized for issuance Share Based Compensation Arrangement By Share Based Payment Award, Remaining Number of Shares Authorized The difference between the maximum number of shares (or other type of equity) originally authorized for issuance under the plan (including the effects of amendments and adjustments), and the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan. Shares authorized for issuance Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Stock options Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Outstanding at beginning of year Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Grants Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Forfeited Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Expired Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period Outstanding at end of year Exercisable at end of year Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Stock options weighted-average exercise price Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward] Weighted-average exercise price of options outstanding at beginning of year (in dollars per option) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Weighted-average exercise price of option grants (in dollars per option) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Weighted-average exercise price of options exercised (in dollars per option) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Weighted-average exercise price of options forfeited (in dollars per option) Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Weighted-average exercise price of options expired (in dollars per option) Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price Weighted-average exercise price of options outstanding at end of year (in dollars per option) Weighted-average exercise price of options exercisable at end of year (in dollars per option) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Weighted-average remaining contractual term of options outstanding at end of year Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Weighted-average remaining contractual term of options exercisable at end of year Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Stock-based compensation expense (dollars) Allocated Share-based Compensation Expense Total intrinsic value of options exercised (dollars) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value Aggregate intrinsic value of in-the-money options outstanding (dollars) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Aggregate intrinsic value of options exercisable (dollars) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Stock awards Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Nonvested at beginning of year Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Granted to employees and directors Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Vested (value at vest date was $24.5 million) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Forfeited Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Nonvested at end of year Restricted shares and stock units weighted-average fair value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward] Weighted-average fair value of nonvested restricted shares and restricted stock units at beginning of year (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Weighted-average fair value of restricted shares and restricted stock units granted to employees and directors (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Weighted-average fair value of restricted shares and restricted stock units vested (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Weighted-average fair value of restricted shares and restricted stock units forfeited (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Weighted-average fair value of nonvested restricted shares and restricted stock units at end of year (in dollars per share) Value at vest date (dollars) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value Vested restricted stock units Vested restricted stock units The number of vested but unsettled awards (other than option plans) for which the company is obligated to issue equity instruments or transfer assets to a non-employee director. For these awards the non-employee director has satisfied the service or performance criteria necessary to gain title to the underlying shares but will not receive the shares until separation from the board. Future stock-based compensation expense. Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized [Abstract] First quarter 2013 (dollars) Share based compensation nonvested awards compensation cost to be recognized, next quarter A positive value represents the unrecognized cost of awards outstanding at the balance sheet date under share-based compensation plans that will be recognized during the first quarter following the balance sheet date. Second quarter 2013 (dollars) Share based compensation nonvested awards compensation cost to be recognized, second quarter A positive value represents the unrecognized cost of awards outstanding at the balance sheet date under share-based compensation plans that will be recognized during the second quarter following the balance sheet date. Third quarter 2013 (dollars) Share based compensation nonvested awards compensation cost to be recognized, third quarter A positive value represents the unrecognized cost of awards outstanding at the balance sheet date under share-based compensation plans that will be recognized during the third quarter following the balance sheet date. Fourth quarter 2013 (dollars) Share based compensation nonvested awards compensation cost to be recognized, fourth quarter A positive value represents the unrecognized cost of awards outstanding at the balance sheet date under share-based compensation plans that will be recognized during the fourth quarter following the balance sheet date. Total 2013 (dollars) Share based compensation nonvested awards compensation cost to be recognized, next calendar year A positive value represents the unrecognized cost of awards outstanding at the balance sheet date under share-based compensation plans that will be recognized during the next January through December period subsequent to the balance sheet date. 2014 through 2017 (dollars) Share based compensation nonvested awards compensation cost to be recognized, between second calendar year and vest date A positive value represents the unrecognized cost of awards outstanding at the balance sheet date under share-based compensation plans that will be recognized in the second January subsequent to the balance sheet date through each awards vesting date. Total (dollars) Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized Stock-based compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Earnings Per Share [Abstract] Earnings per share calculations Earnings Per Share [Text Block] Accounts Receivable, Net [Abstract] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Customer [Axis] Customer [Axis] Name or description of individual or groups of customers determined to be disclosed. Customer [Domain] Customer [Domain] Name or description of individual or groups of customers determined to be disclosed. Sponsored mutual funds in the U.S. [Member] Sponsored Mutual Funds In U S [Member] Sponsored mutual funds in the U.S. Receivables from sponsored mutual funds Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts receivable for advisory fees and advisory-related administrative services Accounts Receivable, Net Statement of Cash Flows [Abstract] Cash flows from operating activities Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Adjustments to reconcile net income to net cash provided by operating activities Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation and amortization of property and equipment Depreciation, Nonproduction Stock-based compensation expense Intangible asset amortization Amortization of Intangible Assets Realized gains on the dispositions of sponsored funds Available-for-sale Securities, Gross Realized Gains Changes in securities held by consolidated sponsored investment portfolios Increase (Decrease) in Trading Securities Changes in accounts receivable and accrued revenue Increase (Decrease) in Accounts Receivable Changes in payables and accrued liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities Other changes in assets and liabilities Increase (Decrease) in Other Operating Assets and Liabilities, Net Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities, Continuing Operations Cash flows from investing activities Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract] Investment in UTI Asset Management Company Limited Payments to Acquire Equity Method Investments Investments in sponsored funds Payments to Acquire Available-for-sale Securities, Equity Dispositions of sponsored funds Proceeds from Sale of Available-for-sale Securities, Equity Investments in debt securities held by savings bank subsidiary Payments to Acquire Available-for-sale Securities, Debt Proceeds from debt securities held by savings bank subsidiary Proceeds from sale and maturity of available for sale securities, debt A positive value represents the cash inflow associated with the maturity (principal being due) or sale of available-for-sale debt securities. Other investments made Payments to Acquire Other Investments Proceeds from other investments Proceeds from Sale of Other Investments Additions to property and equipment Payments to Acquire Property, Plant, and Equipment Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities, Continuing Operations Cash flows from financing activities Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] Repurchases of common stock Payments for Repurchase of Common Stock Common share issuances under stock-based compensation plans Proceeds from stock options exercised, net of payments for repurchase of common stock for employee tax withholding obligations and strike price The cash inflow associated with the amount received from holders exercising their stock options net of 1) shares swapped by the employee to pay the cost of related employee stock option awards and 2) cash outflows paid by the company to cover an employee's income tax withholding obligation as part of a net-share settlement of a share-based award. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. A positive value represents cash inflows in excess of cash outflows listed. A negative value represents cash outflows in excess of the cash inflow described. Excess tax benefits from stock-based compensation plans Excess Tax Benefit (Tax Deficiency) from Share-based Compensation, Financing Activities Dividends Payments of Dividends Change in savings bank subsidiary deposits Increase (Decrease) in Time Deposits Net cash used in financing activities Net Cash Provided by (Used in) Financing Activities, Continuing Operations Cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) [Abstract] Net change during year Cash and Cash Equivalents, Period Increase (Decrease) At beginning of year Cash and Cash Equivalents, at Carrying Value At end of year Goodwill and Intangible Assets Disclosure [Abstract] Number of distinct operating segments through which we internally conduct, manage, and report our operations Number of Reportable Segments Number of reportable business segments and units to which goodwill is attributed Number of Operating Segments ASSETS Assets [Abstract] Cash and cash equivalents Accounts receivable and accrued revenue Investments in sponsored funds Available-for-sale Securities, Equity Securities Debt securities held by savings bank subsidiary Available-for-sale Securities, Debt Securities Other investments Other Investments Property and equipment Property, Plant and Equipment, Net Goodwill Goodwill Other assets Prepaid Expense and Other Assets Total assets Assets LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities and Equity [Abstract] Liabilities Liabilities [Abstract] Accounts payable and accrued expenses Accounts Payable and Other Accrued Liabilities Accrued compensation and related costs Employee-related Liabilities Income taxes payable Accrued Income Taxes Customer deposits at savings bank subsidiary Time Deposits Total liabilities Liabilities Commitments and contingent liabilities Commitments and Contingencies Stockholders' equity Stockholders' Equity Attributable to Parent [Abstract] Preferred stock, undesignated, $.20 par value - authorized and unissued 20,000,000 shares Preferred Stock, Value, Issued Common stock, $.20 par value - authorized 750,000,000; issued 253,272,000 shares in 2011 and 257,018,000 in 2012 Common Stock, Value, Issued Additional capital in excess of par value Additional Paid in Capital, Common Stock Retained earnings Retained Earnings, Unappropriated Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax Total stockholders' equity Stockholders' Equity Attributable to Parent Total liabilities and stockholders' equity Liabilities and Equity Stockholders' Equity Note [Abstract] Stockholders' equity Stockholders' Equity Note Disclosure [Text Block] Investments, All Other Investments [Abstract] Other investments Other Investments [Text Block] The entire disclosure that details the components of Other Investments included on the balance sheet. Revenues and Services [Abstract] Revenues and Services [Abstract] Revenue and Services [Table] Revenue and Services [Table] Summarization of information required and determined to be disclosed concerning advisory service revenues and the assets from which those revenues are derived, by customer and investment mandate. Administrative and distribution services provided to sponsored mutual funds Revenues and Services [Line Items] Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Fees for advisory-related administrative services Fees and Commissions, Other Distribution and other servicing fees Distribution fees A positive value represents fee revenues earned from 12b-1 plans of the Advisor, R, and VIP II classes of sponsored mutual funds that are generally based on a contractual percentage of assets. Risks and Uncertainties [Abstract] Concentration Risk [Table] Concentration Risk [Table] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Geographic Concentration [Member] Geographic Concentration [Member] Reflects the percentage of a disclosed value in notes to the financial statements in the period from one or more specified geographic areas is to a corresponding consolidated amount. Revenues and services concentration Concentration Risk [Line Items] Concentration Risk, Additional Characteristic Concentration Risk, Additional Characteristic Concentration Risk, Percentage Concentration Risk, Percentage Concentration Risk, Benchmark Description Concentration Risk, Benchmark Description Property, Plant and Equipment [Abstract] Schedule of Property, Plant and Equipment [Table] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Computer and communications software and equipment [Member] Computer And Communications Software And Equipment [Member] Long lived, depreciable assets used in the creation, maintenance, and utilization of information systems which include computers and peripherals, as well as capitalized costs of purchased software applications and capitalized costs to develop software for long-term internal use. Buildings and improvements [Member] Building and Building Improvements [Member] Leasehold improvements [Member] Leasehold Improvements [Member] Furniture and other equipment [Member] Furniture and Fixtures [Member] Leased land [Member] Other Capitalized Property Plant and Equipment [Member] Property and equipment Property, Plant and Equipment [Line Items] Estimated useful life Property, Plant and Equipment, Useful Life Other disclosures [Table] Other disclosures [Table] Other disclosures not otherwise separately made but instead accumulated and presented in a single note to the financial statements. Other disclosures Other disclosures [Line Items] [Line Items] for Other disclosures [Table] Compensation expense recognized for defined contribution retirement plans Defined Contribution Plan, Cost Recognized Supplementary quarterly financial data Schedule of Quarterly Financial Information [Table Text Block] Available-for-sale Securities [Abstract] Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities, Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Domain] Major Types of Debt and Equity Securities [Domain] Investments in sponsored funds [Member] Equity Securities [Member] Investment Mandate [Axis] Investment Mandate [Axis] Segregates the information included within the table to which this axis relates by the underlying investment mandate. Investment Mandate [Domain] Investment Mandate [Domain] Segregates the information included within the table to which this axis relates by the underlying investment mandate. Stock and blended asset funds [Member] Equity Funds [Member] Bond funds [Member] Fixed Income Funds [Member] Investments in sponsored funds Schedule of Available-for-sale Securities [Line Items] Aggregate cost Available-for-sale Equity Securities, Amortized Cost Basis Unrealized holding gains Available-for-sale Securities, Gross Unrealized Gains Unrealized holding losses Available-for-sale Securities, Gross Unrealized Losses Aggregate fair value Fund holdings with temporary unrealized holding losses (number of securities) Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions Unrealized holding losses at December 31, 2012, are attributable to ten fund holdings with an aggregate fair value of Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value Other Investments [Table] Other Investments [Table] Summarization of information required and determined to be disclosed concerning all Other Investments. The information is summarized by accounting treatment and separately identifies significant investees. Schedule of Cost Method Investment Cost Method Investee Name [Axis] Schedule of Cost Method Investment Cost Method Investee Name [Axis] This element represents the name of each investee, or group of investees for which combined disclosure is appropriate, in which the Entity has an investment in common stock accounted for under the cost method of accounting. Cost Method Investee, Name [Domain] Cost Method Investee Name [Domain] This element provides the name of each investee, or group of investees for which combined disclosure is appropriate, in which the Entity has an investment in common stock accounted for under the cost method of accounting and for which certain information is required or determined to be disclosed. 10% Interest in Daiwa SB Investments Ltd. (Japan) [Member] Daiwa SB Investments Ltd Japan [Member] Daiwa Sb Investments Ltd Japan [Member] Other cost method investments [Member] Other Cost Method Investments [Member] Other cost method investments Schedule of Equity Method Investment, Equity Method Investee, Name [Axis] Equity Method Investee, Name [Axis] Equity Method Investee, Name [Domain] Equity Method Investee, Name [Domain] 26% Interest in UTI Asset Management Company Limited (India) [Member] UTI Asset Management Company India [Member] UTI Asset Management Company India [Member] Other equity method investments [Member] Other Equity Method Investments [Member] Other equity method investments Schedule of Securities Held as Trading [Axis] Schedule of Securities Held as Trading [Axis] This axis disagregates securities held as trading into general categories of investments required or determined to be disclosed. Schedule Of Securities Held As Trading [Domain] Schedule Of Securities Held As Trading [Domain] This domain disagregates securities held as trading into general categories of investments required or determined to be disclosed. Sponsored mutual fund investments [Member] Sponsored Mutual Fund Investments [Member] Investments in our sponsored mutual fund products. Securities held by consolidated sponsored investment portfolios [Member] Securities Held By Consolidated Sponsored Mutual Funds [Member] Securities held by consolidated sponsored mutual funds [Member] Other investments Other Investments [Line Items] Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Cost method investments Cost Method Investments Equity method investments Equity Method Investments Investments held as trading Trading Securities U.S. Treasury note Held-to-maturity Securities Total Cost method investment (ownership percentage) Cost Method Investment, Ownership Percentage The percentage of ownership or equity participation in an investee accounted for under the cost method of accounting. Equity method investment (ownership percentage) Equity Method Investment, Ownership Percentage Commitment to fund other investments Commitment To Fund Other Investments A positive value represents the dollar value of an unrecorded commitment to fund additional investments as of the balance sheet date. Income taxes Income Tax Disclosure [Text Block] Banking and Thrift [Abstract] Investments in debt securities held by savings bank subsidiary reconciliation Schedule of Available-for-sale Securities Debt Securities Reconciliation [Table Text Block] Tabular disclosure of the reconciliation of available-for-sale debt securities from fair value to cost basis. Interest income and interest expense Interest Income and Interest Expense [Table Text Block] Tabular disclosure of interest income on securities classified neither as held-to-maturity nor trading ("available-for-sale securities") including: (a) interest and dividends earned on all securities and (b) amortization and accretion (as applicable) of discounts and premiums, if any, as well as related interest expense. Document and Entity Information [Abstract] Document and Entity Information [Abstract] Document Type Document Type Document Period End Date Document Period End Date Current Fiscal Year End Date Current Fiscal Year End Date Document Fiscal Period Focus Document Fiscal Period Focus Document Fiscal Year Focus Document Fiscal Year Focus Entity Registrant Name Entity Registrant Name Entity Incorporation, State Country Name Entity Incorporation, State Country Name Entity Tax Identification Number Entity Tax Identification Number Entity Address, Address Line One Entity Address, Address Line One Entity Address, City or Town Entity Address, City or Town Entity Address, State or Province Entity Address, State or Province Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Listing, Par Value Per Share (in dollars per share) Entity Listing, Par Value Per Share Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Voluntary Filers Entity Current Reporting Status Entity Current Reporting Status Entity Filer Category Entity Filer Category Entity Public Float (dollars) Entity Public Float Entity Common Stock, Shares Outstanding (shares) Entity Common Stock, Shares Outstanding Entity Central Index Key Entity Central Index Key Amendment Flag Amendment Flag Leases, Operating [Abstract] Rental expense Operating Leases, Rent Expense Future minimum operating lease payments Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] Future minimum operating lease payments, due in 2013 Operating Leases, Future Minimum Payments Due, Next Twelve Months Future minimum operating lease payments, due in 2014 Operating Leases, Future Minimum Payments, Due in Two Years Future minimum operating lease payments, due in 2015 Operating Leases, Future Minimum Payments, Due in Three Years Future minimum operating lease payments, due in 2016 Operating Leases, Future Minimum Payments, Due in Four Years Future minimum operating lease payments, due in 2017 Operating Leases, Future Minimum Payments, Due in Five Years Future minimum operating lease payments, due in later years Operating Leases, Future Minimum Payments, Due Thereafter Organization, Consolidation and Presentation of Financial Statements [Abstract] Summary of significant accounting policies Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] Net deferred tax asset (liability) and other tax disclosures [Table] Net deferred tax asset (liability) and other tax disclosures [Table] Disclosure of the components of the net deferred tax asset or liability recognized in an entity's statement of financial position as well as other tax disclosures. Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Other assets [Member] Other Assets [Member] Net deferred tax asset (liability) and other tax disclosures Net deferred tax asset (liability) and other tax disclosures [Line Items] [Line Items] for Disclosure of the components of the net deferred tax asset or liability recognized in an entity's statement of financial position as well as other tax disclosures. Deferred tax liabilities Deferred Tax Liabilities, Gross [Abstract] Related to property and equipment Deferred Tax Liabilities, Property, Plant and Equipment Recognized in other comprehensive income on net unrealized holding gains Deferred Tax Liabilities, Other Comprehensive Income Other Deferred Tax Liabilities, Other Total deferred tax liabilities Deferred Tax Liabilities, Gross Deferred tax assets Deferred Tax Assets, Gross [Abstract] Related to stock-based compensation Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost Related to other-than-temporary impairments of investments in sponsored funds Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Impairment Losses Related to accrued compensation Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Other Recognized in other comprehensive income on cumulative translation adjustment Deferred Tax Assets, Other Comprehensive Loss Other Deferred Tax Assets, Other Total deferred tax assets Deferred Tax Assets, Gross Net deferred tax asset Deferred Tax Assets, Net Estimated unremitted earnings of foreign subsidiaries, for which a deferred tax liability has not been recognized Undistributed Earnings of Foreign Subsidiaries Tax refund receivables Income Taxes Receivable Income taxes paid included in cash outflows from operating activities Income Taxes Paid, Net Additional income tax benefits from stock-based compensation plans activity that reduced the amount of income taxes that would have otherwise been payable Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options Land [Member] Land [Member] Compensation and related costs attributable to the development of computer software for internal use [Member] Software Development [Member] Property and equipment, gross Property, Plant and Equipment, Gross Less accumulated depreciation and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Total Property and equipment, additions Property, Plant and Equipment, Additions Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] Assumptions used in option pricing model and grant date fair value of options Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Components of Income Tax Provision [Table] Components of Income Tax Provision [Table] Disclosure of the components of our income tax provision during the period, including U.S. federal, foreign, state and local, and deferred taxes, by components, as well as a reconciliation of the statutory federal rate to the effective income tax rate. Deferred Tax Expense (Benefit) [Axis] Deferred Tax Expense (Benefit) [Axis] Description and amount of the components of deferred tax expense (benefit), by component. Deferred Tax Expense (Benefit) [Domain] Deferred Tax Expense Benefit [Domain] Identifies the component of deferred tax expense or benefit. Relating to the recognition of stock-based compensation expense [Member] Relating To Recognition Of Stock Based Compensation Expense [Member] Relating to the recognition of stock-based compensation expense [Member] Relating to property and equipment [Member] Relating To Property And Equipment [Member] Relating to property and equipment [Member] Related to other-than-temporary impairments previously recognized on sponsored fund investments [Member] Attributable To Other Than Temporary Impairments Recognized On Our Sponsored Mutual Fund Investments [Member] Attributable to other than temporary impairments recognized on our sponsored mutual fund investments [Member] Related to accrued compensation [Member] Relating to accrued compensation [Member] Relating to accrued compensation [Member] Components of income tax provision Components of income tax provision [Line Items] Components of income tax provision [Line Items] Current income taxes Current Income Tax Expense (Benefit) [Abstract] U.S. federal Current Federal Tax Expense (Benefit) Foreign Current Foreign Tax Expense (Benefit) State and local Current State and Local Tax Expense (Benefit) Deferred income taxes (tax benefits) Deferred Income Tax Expense (Benefit) Total Income Tax Expense (Benefit), Continuing Operations Statutory U.S. federal income tax rate (percentage) Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate State income taxes for current year, net of federal income tax benefits (percentage) Effective Income Tax Rate Reconciliation, State and Local Income Taxes Other items (percentage) Effective Income Tax Rate Reconciliation, Other Adjustments Effective income tax rate (percentage) Effective Income Tax Rate, Continuing Operations Duration of fund holding unrealized loss between quarter ends generally presumed to represent other than temporary impairment Available for sale equity securities in unrealized loss position, qualitative disclosure, other than temporary impairment policy, loss term The period of time between quarter ends after which available-for-sale equity securities in a continuous unrealized loss position will be considered other than temporarily impaired under the company's impairment policy. Minimum period of time between purchase and maturity for debt securities to be measured at fair value under our investment valuation policy Available for sale marketable debt securities, market price valuation policy, purchase to maturity period The minimum period of time between purchase and original maturity of marketable debt securities classified as available-for-sale that requires the securities to be valued based on prices furnished by dealers who make markets in such securities or by an independent pricing service under the company's investment valuation policy. Maximum period of time between purchase and maturity for debt securities to be measured at amortized cost under our investment valuation policy Available for sale marketable debt securities, amortized cost valuation policy, purchase to maturity period The maximum period of time between purchase and original maturity of marketable debt securities classified as available-for-sale that requires the securities to be valued at amortized cost under the company's investment valuation policy. Statement of Other Comprehensive Income [Abstract] Statement [Table] Statement [Table] Debt securities held by savings bank subsidiary [Member] Debt Securities [Member] Proportionate share of securities held by UTI Asset Management Company Limited [Member] Proportionate Share Of Available For Sale Securities Held By Equity Method Investee [Member] Proportionate share of available for sale securities held by equity method investee [Member] Statement Statement [Line Items] Other comprehensive income (loss) Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent [Abstract] Net unrealized holding gains (losses) on: Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax, Portion Attributable to Parent [Abstract] Net unrealized holding gains (losses) Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax Reclassification adjustment related to capital gains distributions Other Comprehensive Income (Loss) Adjustment for Capital Gain Distribution Received Before Tax A negative value represents the before tax reduction in other comprehensive income upon reclassification of capital gain distributions included in non-operating income. Reclassification adjustment on net gains realized on dispositions in non-operating investment income Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, before Tax Total net unrealized holding gains (losses) recognized in other comprehensive income Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax, Portion Attributable to Parent Currency translation adjustment Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax, Portion Attributable to Parent Total other comprehensive income (loss) before income taxes Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent Deferred tax benefits (income taxes) Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent Total other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Total comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Investments in sponsored funds reconciliation Schedule of Available-for-sale Securities Equity Securities Reconciliation [Table Text Block] Tabular disclosure of the reconciliation of available-for-sale equity securities from cost basis to fair value. Nature of operations Nature of Operations [Text Block] Basis of preparation - basis of accounting Basis of Accounting, Policy [Policy Text Block] Basis of preparation - use of estimates Use of Estimates, Policy [Policy Text Block] Basis of preparation - reclassifications Reclassifications [Text Block] New financial reporting guidance New Accounting Pronouncements, Policy [Policy Text Block] Consolidation Consolidation, Subsidiaries or Other Investments, Consolidated Entities, Policy [Policy Text Block] Cash equivalents Cash and Cash Equivalents, Unrestricted Cash and Cash Equivalents, Policy [Policy Text Block] Investments in sponsored funds and debt securities held by savings bank subsidiary Marketable Securities, Available-for-sale Securities, Policy [Policy Text Block] Other investments - cost and equity method investments Equity and Cost Method Investments, Policy [Policy Text Block] Other investments - trading securities Marketable Securities, Trading Securities, Policy [Policy Text Block] Concentrations of risk Concentration Risk Disclosure [Text Block] Property and equipment Property, Plant and Equipment, Policy [Policy Text Block] Goodwill Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block] Revenue recognition - investment advisory, distribution, and servicing fees Management and Investment Advisory Fees, Policy [Policy Text Block] Revenue recognition - taxes billed to clients Revenue Recognition Accounting Policy, Gross and Net Revenue Disclosure [Policy Text Block] Advertising Advertising Cost, Policy, Expensed Advertising Cost [Policy Text Block] Stock-based compensation Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] Earnings per share Earnings Per Share, Policy [Policy Text Block] Less: net income allocated to outstanding restricted stock and stock unit holders Participating Securities, Distributed and Undistributed Earnings Net income allocated to common stockholders (basic) Net Income (Loss) Available to Common Stockholders, Basic Net income allocated to common stockholders (diluted) Net Income (Loss) Available to Common Stockholders, Diluted Weighted-average common shares Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Outstanding (shares) Weighted Average Number of Shares Outstanding, Basic Outstanding assuming dilution (shares) Weighted Average Number of Shares Outstanding, Diluted Weighted-average outstanding stock options excluded (options) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Average exercise price (in dollars per option) Antidilutive Securities Excluded From Computation Of Earnings Per Share Weighted Average Exercise Price The weighted average exercise price of securities that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented. Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Components of Accumulated Other Comprehensive Income (Loss) [Table] Components of Accumulated Other Comprehensive Income (Loss) [Table] Tabular disclosure of the period end balances and changes in accumulated other comprehensive income (loss) by component, net of deferred tax recognized. Investments in sponsored funds [Member] Proportionate share of investments held by UTI [Member] Accumulated other comprehensive income (loss) Components of Accumulated Other Comprehensive Income (Loss) [Line Items] Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Net unrealized holding gains Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) Available For Sale Securities, Before Tax [Roll Forward] A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. Net unrealized holding gains Accumulated Other Comprehensive Income Loss Available For Sale Securities Before Tax Accumulated gross appreciation net of gross loss in value of the total of unsold securities at the end of the period. A positive value represents the gross appreciation in excess of gross losses and a negative value represents the gross losses in excess of gross appreciation. Net unrealized holding gains (losses) recognized in other comprehensive income (loss) Net unrealized holding gains Deferred income taxes Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) Available for Sale Securities, Tax [Roll Forward] A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. Deferred income taxes Accumulated Other Comprehensive Income Loss Available for Sale Securities Tax Tax effect of the accumulated gross appreciation or the gross loss in value of the total of unsold securities at the end of an accounting period. A positive value represents the tax effect of an unrealized gain and a negative value represents the tax effect of an unrealized loss. Deferred income taxes (tax benefits) recognized in other comprehensive income (loss) Other Comprehensive Income (Loss), Available-for-sale Securities, Tax, Portion Attributable to Parent Deferred income taxes Net unrealized holding gains, net of taxes Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) Available For Sale Securities, Adjustment, Net of Taxes [Roll Forward] A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. Net unrealized holding gains, net of taxes Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax Net unrealized holding gains (losses) recognized in other comprehensive income, net of taxes Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent Net unrealized holding gains, net of taxes Currency translation adjustment, net of taxes Increase (Decrease) in Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax [Roll Forward] A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. Currency translation adjustment, net of taxes Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax Currency translation adjustment recognized in other comprehensive income (loss), net of taxes Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent Currency translation adjustment, net of taxes Accumulated other comprehensive income Increase (Decrease) in Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] [Roll Forward] A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. Accumulated other comprehensive income Accumulated other comprehensive income Income Statement [Abstract] Revenues Revenues, Net of Interest Expense [Abstract] Investment advisory fees Investment Advisory Fees Administrative fees Distribution and servicing fees Net revenue of savings bank subsidiary Net revenues Operating expenses Operating Expenses [Abstract] Compensation and related costs Labor and Related Expense Advertising and promotion Marketing and Advertising Expense Distribution and servicing costs Distribution Costs A positive value represents costs paid to financial intermediaries that source assets into the Advisor, R, and VIP II share classes of sponsored mutual funds. Occupancy and facility costs Occupancy Facility Costs A positive value represents the amount of net occupancy expense including maintenance of facilities and equipment, lease expenses, property taxes and property and casualty insurance expense. Other operating expenses Other Cost and Expense, Operating Total operating expenses Operating Expenses Net operating income Operating Income (Loss) Non-operating investment income Investment Income, Nonoperating Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest Provision for income taxes Net income Earnings per share on common stock Basic (in dollars per share) Diluted (in dollars per share) Earnings per share reconciliation Schedule of Calculation of Numerator and Denominator in Earnings Per Share [Table Text Block] Antidilutive securities Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Other comprehensive income and accumulated other comprehensive income Comprehensive Income (Loss) Note [Text Block] Stockholders' Equity Note [Table] Stockholders' Equity Note [Table] Stockholders' Equity Note [Table] Dividends [Axis] Dividends [Axis] Dividends [Domain] Dividends [Domain] Ordinary Dividend [Member] Ordinary Dividend [Member] Ordinary Dividend [Member] Special Dividend [Member] Special Dividend [Member] Special Dividend [Member] Stockholders' Equity Note Stockholders' Equity Note [Line Items] [Line Items] for Stockholders' Equity Note [Table] Shares authorized for future repurchase (shares) Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased Cash dividends declared per share Common Stock, Dividends, Per Share, Declared Cash dividends paid per share Common Stock, Dividends, Per Share, Cash Paid Restricted stockholders' equity (dollars) Amount of Restricted Net Assets for Consolidated and Unconsolidated Subsidiaries Assets, Fair Value Disclosure [Abstract] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value, Liabilities Measured on Recurring Basis, Disclosure Items [Axis] Fair Value, Hierarchy [Axis] Fair Value, Liabilities Measured on Recurring Basis, Disclosure Items [Domain] Fair Value, Measurements, Fair Value Hierarchy [Domain] Level 1 [Member] Fair Value, Inputs, Level 1 [Member] Level 2 [Member] Fair Value, Inputs, Level 2 [Member] Fair Value by Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Fair Value, Measurements, Recurring [Member] Fair Value, Measurements, Recurring [Member] Fair value measurements Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Investments held as available-for-sale Available-for-sale Securities, Fair Value Disclosure Investments held as trading Trading Securities, Fair Value Disclosure Total Assets, Fair Value Disclosure, Recurring Liabilities, Fair Value Disclosure [Abstract] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping, Disclosure Item Amounts [Axis] Fair Value, by Balance Sheet Grouping, Disclosure Item Amounts [Axis] Fair Value, Disclosure Item Amounts [Domain] Fair Value, Disclosure Item Amounts [Domain] Estimate of Fair Value, Fair Value Disclosure [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Fair value measurements Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Maximum maturities of customer deposits Fair Value Measurements, Significant Assumptions, Customer Deposits Higher Remaining Maturity Range High end period remaining until maturity used as an input for the fair value measurement of customer deposit liability disclosure in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Estimated fair value of customer deposits Deposits, Fair Value Disclosure Savings bank subsidiary Banking and Thrift Disclosure [Text Block] Deferred tax benefit (income tax) impact of the components of other comprehensive income Schedule of Comprehensive Income (Loss) [Table Text Block] Changes in accumulated other comprehensive income Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent, Parenthetical Disclosures [Abstract] Deferred tax benefit (income taxes) on Other Comprehensive Income (Loss), Available-for-sale Securities, Tax, Portion Attributable to Parent [Abstract] Net unrealized holding gains or losses Other Comprehensive Income (Loss), Available-for-sale Securities, before Reclassification Adjustments, Tax Capital gain distributions Other Comprehensive Income (Loss) Available for Sale Securities, Reclassification Adjustment for Capital Gains Distributions Received, Tax A negative value represents the tax effect of other comprehensive loss recognized when capital gain distributions are included in non-operating income. Capital gain distributions are dividends received by mutual fund shareholders that are paid out of the capital gains recognized by the underlying fund. Reclassification adjustment on net gains or losses realized on dispositions in non-operating investment income Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Tax Deferred tax benefits (income taxes) on net unrealized holding gains or losses recognized in other comprehensive income Deferred tax benefit (expense) on currency translation adjustment Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax, Portion Attributable to Parent Total deferred tax benefits (income taxes) Investments in sponsored funds Available for Sale Equity Securities, Disclosure [Text Block] Disclosure of available-for-sale equity securities which includes, but is not limited to, reconciliation of cost basis to fair value, fair values by type of security, aggregate losses qualitative disclosure, dividends earned, and other disclosures related to available for sale equity securities. Income Tax Uncertainties [Abstract] Balance at beginning of year Unrecognized Tax Benefits that Would Impact Effective Tax Rate Changes in tax positions related to current year Unrecognized tax benefits increases (decreases) resulting from current period tax positions The amount of net increases or decreases in unrecognized tax benefits resulting from tax positions that have been or will be taken in the tax return for the current period, excluding amounts pertaining to examined tax returns. A positive value represents a net increase in unrecognized tax benefits and a negative value represents a net decrease in unrecognized tax benefits. Changes in tax positions related to prior years Unrecognized tax benefits increases (decreases) resulting from prior period tax positions The amount of net increases or decreases in unrecognized tax benefits resulting from tax positions taken in prior period tax returns, excluding amounts pertaining to examined tax returns. A positive value represents a net increase in unrecognized tax benefits and a negative value represents a net decrease in unrecognized tax benefits. Changes in tax positions related to expired statute of limitations Unrecognized Tax Benefits, Reductions Resulting from Lapse of Applicable Statute of Limitations Balance at year end Net interest recoverable Unrecognized Tax Benefits Interest On Income Taxes Receivable This element represents the amount of net interest receivable as of the date of the statement of financial position for an overpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between the amount previously taken or expected to be taken in a tax return of the entity and a tax position recognized for financial reporting purposes. Property and equipment Property, Plant and Equipment Disclosure [Text Block] Cash equivalent investments in our sponsored money market mutual funds Money Market Funds, at Carrying Value Other portfolios [Member] Other Portfolios [Member] Other portfolios Stock and blended asset [Member] Stock And Blended Asset [Member] Stock and blended asset [Member] Bond and money market [Member] Bond And Money Market [Member] Bond and money market [Member] Bond, money market, and stable value [Member] Bond Money Market And Stable Value [Member] Bond, money market and stable value [Member] Investment advisory services Revenues from advisory services Average assets under management Assets under Management, Average Balance Period end assets under management Assets under Management, Carrying Amount Statement of Stockholders' Equity [Abstract] Statement, Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common stock [Member] Common Stock [Member] Additional capital in excess of par value [Member] Additional Paid-in Capital [Member] Retained earnings [Member] Retained Earnings, Unappropriated [Member] Accumulated other comprehensive income (loss) [Member] Accumulated Other Comprehensive Income (Loss) [Member] Increase (decrease) in stockholders' equity Increase (Decrease) in Stockholders' Equity [Roll Forward] Balances (shares) Balances Other comprehensive income, net of tax Dividends Dividends Common stock-based compensation plans activity Share-based Compensation [Abstract] Shares issued upon option exercises (shares) Stock Issued During Period Stock Options Exercised Net Of Shares For Tax Withholding Strike Price A positive value represents the number of shares of stock issued during the period as a result of option exercises, net of shares withheld for the payment of withholding taxes and shares swapped for payment of strike price. Shares issued upon option exercises Stock Issued During Period Value Stock Options Exercised Net of Tax Witholdings Strike Price A positive value represents the value of stock issued as a result of the exercise of stock options less values of underlying shares swapped by the employee to pay the cost of the related stock option award and withheld to pay related income tax obligations. Restricted shares issued, net of shares withheld for taxes (shares) Restricted Stock, Shares Issued Net of Shares for Tax Withholdings Restricted shares issued, net of shares withheld for taxes Restricted Stock, Value, Shares Issued Net of Tax Withholdings Shares issued upon vesting of restricted stock units (shares) Stock Issued During Period, Shares, Other Shares issued upon vesting of restricted stock units Stock Issued During Period, Value, Other Forfeiture of restricted awards (shares) Stock Issued During Period, Shares, Restricted Stock Award, Forfeited Forfeiture of restricted awards Stock Issued During Period, Value, Restricted Stock Award, Forfeitures Net tax benefits Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net Stock-based compensation expense Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Common shares repurchased (shares) Stock Repurchased During Period, Shares Common shares repurchased Stock Repurchased During Period, Value Balances (shares) Balances Property and equipment table Property, Plant and Equipment [Table Text Block] Components of other investments Components of Other Investments [Text Block] Tabular disclosure of the components of other investments, including those accounted for under the cost, equity and other methods. Debt securities held by savings bank subsidiary Investments with temporary impairment (18 securities in 2012) of (fair values) Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] Investments with temporary impairment (number of securities) Fair value of investments with temporary impairment of less than 12 months Fair value of investments with temporary impairment of 12 months or more Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value Total fair value of investments with temporary impairment Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value Fair value of investments with unrealized holding gains Investments with unrealized holding gains A positive value represents the fair value of securities categorized neither as held-to-maturity nor trading securities that have unrealized gains at the end of the reporting period. Total fair value Aggregate cost Available-for-sale Debt Securities, Amortized Cost Basis Investments with temporary impairment (18 securities in 2012) of (unrealized holding gains (losses)) Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] Unrealized holding losses on investments with temporary impairment of less than 12 months Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses Unrealized holding losses on investments with temporary impairment of 12 months or more Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses Total unrealized holding losses on investments with temporary impairment Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Total unrealized holding gains (losses) Available-for-sale Securities, Gross Unrealized Gain (Loss) Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Cause Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Cause Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Other Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Other Dividends, excluding capital gain distributions, earned on sponsored mutual fund investments