Accounting Policies [Abstract] Summary of Significant Accounting Policies Basis of Presentation and Significant Accounting Policies [Text Block] Intangible Assets, Net (Excluding Goodwill) [Abstract] Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Business Segments [Axis] Business Segments [Axis] Segment [Domain] Segment [Domain] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Total amortization expense of intangible assets Amortization of Intangible Assets Income Statement [Abstract] Statement [Table] Statement [Table] Statement, Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Statement [Line Items] Statement [Line Items] REVENUES: Revenues [Abstract] Commission Brokerage Commissions Revenue Advisory Investment Advisory Fees Asset-based Asset Based Fees Revenue recognized in the period for fees from cash sweep programs, sponsorship programs, omnibus processing and networking services. Transaction and other Transaction And Other Fees Revenue recognized in the period from transaction fees and ticket charges, subscription fees, IRA custodian fees, contract and license fees, conference fees and small or inactive account fees. Interest income, net of interest expense Interest Income (Expense), Net Other Other Income Total net revenues Revenues EXPENSES: Operating Expenses [Abstract] Commission and advisory Commissions And Advisory Fees Gross commissions and advisory fees that are earned and paid out to customers based on the sale of various products and services, production bonuses for achieving production levels, share-based compensation expense for stock options and warrants granted to customers, and deferred commissions for customers as part of a non-qualified deferred compensation plan. Compensation and benefits Labor and Related Expense Promotional Promotional Expenses The total expense recognized in the period for promotional items and business development costs. Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Occupancy and equipment Occupancy, Net Professional services Professional Fees Brokerage, clearing and exchange Floor Brokerage, Exchange and Clearance Fees Communications and data processing Communications and Information Technology Regulatory fees and other Regulatory Fees And Expenses Expenses incurred during the period for regulatory memberships to FINRA and SIPC, representative licensing fees, some insurance and other regulatory fees. Restructuring charges Restructuring Charges Other Other Expenses Total operating expenses Operating Expenses Non-operating interest expense Interest Expense, Subordinated Notes and Debentures Loss on extinguishment of debt Gains (Losses) on Extinguishment of Debt Total expenses Expenses Total expenses incurred in the period presented, including both operating and non-operating expenses. Excludes income tax expense. INCOME BEFORE PROVISION FOR INCOME TAXES Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest PROVISION FOR INCOME TAXES Income Tax Expense (Benefit) NET INCOME Net Income (Loss) Attributable to Parent EARNINGS PER SHARE (Note 11): Earnings Per Share [Abstract] Basic Earnings Per Share, Basic Diluted Earnings Per Share, Diluted Income Tax Disclosure [Abstract] Income Taxes Income Tax Disclosure [Text Block] Fair Value Disclosures [Abstract] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] National Retirement Partners [Member] National Retirement Partners [Member] National retirement partners. Concord Capital Partners [Member] Concord Capital Partners [Member] Concord capital partners. Veritat [Member] Veritat [Member] [Domain] Veritat Advisors, Inc. Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value, Inputs, Level 3 [Member] Fair Value, Inputs, Level 3 [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, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair value at December 31, 2012 Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value Net changes in estimated fair value of contingent consideration obligations Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings Fair value at March 31, 2013 Investments, Debt and Equity Securities [Abstract] Schedule of Held-to-maturity Securities [Table] Schedule of Held-to-maturity Securities [Table] Debt Security [Axis] Debt Security [Axis] Major Types of Debt Securities [Domain] Major Types of Debt Securities [Domain] US government notes [Member] US Government Agencies Debt Securities [Member] Schedule of Held-to-maturity Securities [Line Items] Schedule of Held-to-maturity Securities [Line Items] Maturities of securities held-to-maturity Held-to-maturity Securities, Debt Maturities [Abstract] U.S. government notes - at amortized cost, Within one year Held-to-maturity Securities, Debt Maturities, within One Year, Net Carrying Amount U.S. government notes - at amortized cost, After one but within five years Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount U.S. government notes - at amortized cost, After five through ten years Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount U.S. government notes - at amortized cost, Total Held-to-maturity Securities, Debt Maturities, Net Carrying Amount U.S. government notes - at fair value, Within one year Held-to-maturity Securities, Debt Maturities, Next Twelve Months, Fair Value U.S. government notes - at fair value, After one but within five years Held-to-maturity Securities, Debt Maturities, Year Two Through Five, Fair Value U.S. government notes - at fair value, After five through ten years Held-to-maturity Securities, Debt Maturities, Year Six Through Ten, Fair Value U.S. government notes - at fair value, Total Held-to-maturity Securities, Debt Maturities, Fair Value Amortization expense Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] 2013 - remainder Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 2014 Finite-Lived Intangible Assets, Amortization Expense, Year Two 2015 Finite-Lived Intangible Assets, Amortization Expense, Year Three 2016 Finite-Lived Intangible Assets, Amortization Expense, Year Four 2017 Finite-Lived Intangible Assets, Amortization Expense, Year Five Thereafter Finite-Lived Intangible Assets, Amortization Expense, after Year Five Total Finite-Lived Intangible Assets, Net Related Party Transactions [Abstract] Related Party Transactions Related Party Transactions Disclosure [Text Block] Statement of Stockholders' Equity [Abstract] Statement, Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock Common Stock [Member] Additional Paid-In Capital Additional Paid-in Capital [Member] Treasury Stock Treasury Stock [Member] Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Income (Loss) [Member] Retained Earnings Retained Earnings [Member] BEGINNING BALANCE Stockholders' Equity Attributable to Parent BEGINNING BALANCE, shares Shares, Issued Net income and other comprehensive income, net of tax expense Comprehensive Income (Loss), Net of Tax, Attributable to Parent Issuance of common stock to settle restricted stock units Stock Issued During Period, Value, Restricted Stock Award Released Value of stock related to Restricted Stock Awards released during the period. Issuance of common stock to settle restricted stock units, shares Stock Issued During Period, Shares, Restricted Stock Award Released Shares of stock related to Restricted Stock Awards released during the period. Treasury stock purchases (Note 10) Treasury Stock, Value, Acquired, Cost Method Treasury stock purchases (Note 10), shares Treasury Stock, Shares, Acquired Dividends declared on common stock Dividends, Common Stock Cash dividends on common stock Dividends, Common Stock, Cash Stock option exercises and other Stock Issued During Period, Value, Stock Options Exercised Stock option exercises and other, shares Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures Share-based compensation Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Excess tax benefits from share-based compensation Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net ENDING BALANCE ENDING BALANCE, shares Restructuring and Related Activities [Abstract] Total Expected Restructuring Costs Restructuring and Related Cost, Expected Cost Subsequent Event [Abstract] Subsequent Event [Abstract] Subsequent Event [Table] Subsequent Event [Table] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event [Member] Subsequent Event [Member] Dividends [Axis] Dividends [Axis] Dividends [Domain] Dividends [Domain] Subsequent Event [Line Items] Subsequent Event [Line Items] Common Stock, Dividends, Per Share, Declared Dividends Payable, Amount Per Share Dividends Payable, Date to be Paid Dividends Payable, Date to be Paid Dividends Payable, Date of Record Dividends Payable, Date of Record Concentration Risk Credit Risk Financial Instruments Off Balance Sheet Risk [Abstract] Concentration risk credit risk financial instruments off balance sheet risk. Financial Instruments with Off-Balance-Sheet Credit Risk and Concentrations of Credit Risk Concentration Risk Credit Risk Financial Instruments Off Balance Sheet Risk [Text Block] Description of financial instruments, excluding certain derivatives, with off-balance sheet credit risk (for example, standby letters of credit or financial guarantees), including (1) information about the (shared) activity, region or economic characteristic that identifies the concentration, (2) the face or contract amount of the instrument, (3) the nature and terms of the instrument, including the market risk, cash requirements and accounting policies for it, (4) the maximum amount of loss due to credit risk that would be incurred if the counterparties failed completely to perform according to the terms of the contracts, and any security or collateral that proved to be of no value, (5) the entity's policy of requiring collateral or other security to support financial instruments subject to credit risk, information about access to collateral or other security, and a brief description of the security supporting those financial instruments, and (6) the policy of entering into and a brief description of master netting arrangements to mitigate the credit risk, and the extent to which such arrangements would reduce the maximum amount of loss due to credit risk. Basic and diluted earnings per share computations Schedule of Calculation of Numerator and Denominator in Earnings Per Share [Table Text Block] Statement of Cash Flows [Abstract] CASH FLOWS FROM OPERATING ACTIVITIES: Net Cash Provided by (Used in) Operating Activities [Abstract] Net income 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] Noncash items: Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation and amortization Amortization of debt issuance costs Amortization of Financing Costs Share-based compensation Share-based Compensation Excess tax benefits related to share-based compensation Excess Tax Benefit (Tax Deficiency) from Share-based Compensation, Operating Activities Provision for bad debts Provision for Doubtful Accounts Deferred income tax provision Deferred Income Tax Expense (Benefit) Loss on extinguishment of debt Other Other Noncash Income (Expense) Changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Cash and securities segregated under federal and other regulations Cash And Securities Segregated Under Federal And Other Regulations Changes In Operating Assets And Liabilities The net change during the reporting period in the amount of cash subject to withdrawal restrictions, restricted deposits held as compensating balances, and cash and securities segregated in compliance with regulations (such as cash deposited in a special reserve account for the exclusive benefit of customers pursuant). Receivables from clients Increase Decrease Receivables From Clients The net change during the reporting period in receivables from brokerage clients. Brokerage client balances include margin loans to clients stated, net of allowance for doubtful accounts. Receivables from product sponsors, broker-dealers and clearing organizations Increase (Decrease) in Receivables from Brokers-Dealers and Clearing Organizations Receivables from others Increase (Decrease) in Other Receivables Securities owned Increase (Decrease) in Trading Securities Securities borrowed Increase (Decrease) in Securities Borrowed Other assets Increase (Decrease) in Other Operating Assets Drafts payable Drafts Payable Changes In Operating Assets And Liabilities The net change during the reporting period in the amounts due on drafts payable during the reporting period. Payables to clients Increase Decrease Payables To Clients The net change during the reporting period in payables to clients, includes amounts payable on cash and margin transactions, including interest on certain client balances. Payables to broker-dealers and clearing organizations Increase (Decrease) in Payables to Broker-Dealers and Clearing Organizations Accrued commission and advisory expenses payable Changes In Accrued Commissions And Advisory Fees Payable The net change in the balance of accrued commissions, recruiting bonus accruals, and other commissions payable over the reporting period. Accounts payable and accrued liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities Income taxes receivable/payable Increase (Decrease) in Income Taxes Unearned revenue Increase (Decrease) in Deferred Revenue Securities sold, but not yet purchased Increase (Decrease) in Financial Instruments Sold, Not yet Purchased Net cash provided by (used in) operating activities Net Cash Provided by (Used in) Operating Activities CASH FLOWS FROM INVESTING ACTIVITIES: Net Cash Provided by (Used in) Investing Activities [Abstract] Capital expenditures Payments to Acquire Property, Plant, and Equipment Purchase of securities classified as held-to-maturity Payments to Acquire Held-to-maturity Securities Proceeds from maturity of securities classified as held-to-maturity Proceeds from Sale and Maturity of Held-to-maturity Securities Release of restricted cash Release Of Restricted Cash Releases of cash during the period from an escrow account whose use is restricted. Purchases of minority interest investments Payments to Acquire Additional Interest in Subsidiaries Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities CASH FLOWS FROM FINANCING ACTIVITIES: Net Cash Provided by (Used in) Financing Activities [Abstract] Repayment of senior secured credit facilities Repayments of Long-term Lines of Credit Proceeds from senior secured credit facilities Proceeds from Long-term Lines of Credit Payment of debt amendment costs Payments of Debt Issuance Costs Repurchase of common stock Payments for Repurchase of Common Stock Dividends on common stock Payments of Dividends Excess tax benefits related to share-based compensation Excess Tax Benefit (Tax Deficiency) from Share-based Compensation, Financing Activities Proceeds from stock option exercises and other Proceeds from Stock Options Exercised Net cash used in financing activities Net Cash Provided by (Used in) Financing Activities NET DECREASE IN CASH AND CASH EQUIVALENTS Cash and Cash Equivalents, Period Increase (Decrease) CASH AND CASH EQUIVALENTS - Beginning of period Cash and Cash Equivalents, at Carrying Value CASH AND CASH EQUIVALENTS - End of period SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION: Supplemental Cash Flow Information [Abstract] Interest paid Interest Paid Income taxes paid Income Taxes Paid NONCASH DISCLOSURES: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Gain on interest rate swaps, net of tax expense Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax Dividends declared but not yet paid Dividends Payable Discount on proceeds from senior secured credit facilities recorded as debt issuance costs Discount On Proceeds From Senior Credit Facilities Recorded As Debt Issuance Costs Discount on proceeds from senior credit facilities recorded as debt issuance costs Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Related Party Transactions, by Related Party [Axis] Related Party [Axis] Related Party [Domain] Related Party [Domain] Artisan Partners Limited Partnership Artisan Partners Limited Partnership [Member] Artisan partners limited partnership. American Beacon Advisor, Inc. American Beacon Advisor [Member] American Beacon Advisor Aplifi, Inc. Aplifi, Inc. [Member] Aplifi, Inc. SunGard Data Systems Inc. SunGard Data Systems [Member] SunGard Data Systems Inc. Related Party Transaction [Line Items] Related Party Transaction [Line Items] Revenue from related party transactions Revenue from Related Parties Related party transactions due amounts including transactions in unaudited condensed consolidated financial statements Due from Related Parties Related party transactions expenses Related Party Transaction, Expenses from Transactions with Related Party Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Other comprehensive income, net of tax: Other Comprehensive Income (Loss), Net of Tax [Abstract] Adjustment for items reclassified to earnings, net of tax expense of $254 for the three months ended March 31, 2012 Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax Total other comprehensive income, net of tax Other Comprehensive Income (Loss), Net of Tax TOTAL COMPREHENSIVE INCOME Derivative Instruments, Gain (Loss) by Income Statement Location [Axis] Income Statement Location [Axis] Income Statement and Other Comprehensive Income (Loss) Location [Domain] Income Statement Location [Domain] Accumulated Other Comprehensive Income Tax expense on adjustment for items reclassified to earnings Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax Basic weighted average number of shares outstanding Weighted Average Number of Shares Outstanding, Basic Dilutive common share equivalents Weighted Average Number Diluted Shares Outstanding Adjustment Diluted weighted average number of shares outstanding Weighted Average Number of Shares Outstanding, Diluted Basic earnings per share Diluted earnings per share Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization and Description of the Company Nature of Operations [Text Block] Debt Disclosure [Abstract] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Quarterly repayments of debt instrument [Axis] Quarterly repayments of debt instrument [Axis] Quaterly repayments of the principal of debt instrument made over stated period of time [Axis] Quarterly repayments of debt instrument [Domain] Quarterly repayments of debt instrument [Domain] Quaterly repayments of the principal of debt instrument made over stated period of time [Domain] Years one and two [Member] Years one and two [Member] Years one and two [Member] Years three, four and five [Member] Years three, four and five [Member] Years three, four and five [Member] Interest Base Rate By Type [Axis] Interest Base Rate By Type [Axis] Interest base rate by type. Interest Base Rate By Type [Domain] Interest Base Rate By Type [Domain] Interest base rate by type. Base Rate [Member] Base Rate [Member] Base rate. Libor Rate [Member] Libor Rate [Member] Libor rate. Libor Rate 1 Month [Member] Libor Rate 1 Month [Member] Libor Rate 1 Month [Member] Alternative Base Rate [Member] Alternative Base Rate [Member] Alternative Base Rate [Member] Eurodollar Rate [Member] Eurodollar Rate [Member] Eurodollar Rate [Member] Minimum alternative base rate [Member] Minimum alternative base rate [Member] Minimum alternative base rate [Member] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Two Thousand Seventeen Term Loans [Member] Two Thousand Seventeen Term Loans [Member] Two thousand seventeen term loans. Two Thousand Fifteen Term Loans And Two Thousand Seventeen Term Loans [Member] Two Thousand Fifteen Term Loans And Two Thousand Seventeen Term Loans [Member] Two thousand fifteen term loans and two thousand seventeen term loans. Two Thousand Thirteen Term Loans [Member] Two Thousand Thirteen Term Loans [Member] Two thousand thirteen term loans. Two Thousand Fifteen Term Loans [Member] Two Thousand Fifteen Term Loans [Member] Two thousand fifteen term loans. Tranche 2013 [Member] Tranche 2013 [Member] Tranche 2013 [Member] Bank Loans Payable [Member] Bank Loans Payable [Member] Bank loans payable. Term Loan A [Member] Term Loan A [Member] Term Loan A of Credit Agreement entered into on March 29, 2012 [Member] Term Loan B [Member] Term Loan B [Member] Term Loan B of Credit Agreement entered into on March 29, 2012 [Member] Revolving Line Of Credit [Member] Revolving Line Of Credit [Member] Revolving line of credit. Minimum [Member] Minimum [Member] Line of Credit Facility [Axis] Lender Name [Axis] Line of Credit Facility, Lender [Domain] Line of Credit Facility, Lender [Domain] Debt Instrument [Line Items] Debt Instrument [Line Items] Aggregate principal amount of senior unsecured subordinated notes Debt Instrument, Face Amount Line of Credit Facility, Maximum Borrowing Capacity Line of Credit Facility, Maximum Borrowing Capacity Deferred Finance Costs Capitalized, Credit Agreement Deferred Finance Costs Capitalized, Credit Agreement The amount (net of accumulated amortization) as of the balance sheet date of capitalized costs associated with the issuance of debt instruments added for the Credit Agreement that will be charged against earnings over the life of the debt instruments to which such costs pertain. Amount of line of credit facility used to support irrevocable letters of credit Letter of Credit against Line Of Credit Facility Irrevocable letters of credit held against the revolving credit facility. Line of Credit Facility, Remaining Borrowing Capacity Line of Credit Facility, Remaining Borrowing Capacity Debt instrument periodic payment principal, percent Debt instrument periodic payment principal, percent Required periodic payment percentage applied to principal. Margin rate for borrowings Debt Instrument, Basis Spread on Variable Rate Benchmark short-term interest rate Benchmark Short-term Interest Rate Benchmark Short-term Interest Rate Percentage of commitment fee Line of Credit Facility, Commitment Fee Percentage Amortization of Financing Costs Repayment of Debt Repayment of Debt Repayment of Outstanding Debt Balance Line of credit facility maturity period extended Line Of Credit Facility Maximum Borrowing Capacity Before Amendment Line of credit facility maximum borrowing capacity before amendment. Number of uncommitted lines of credit Number Of Uncommitted Lines Of Credit Number of uncommitted lines of credit mainted by the Company. Number of uncommitted lines of credit, unspecified limit Uncommitted lines of credit, unspecified limit The number of uncommitted lines of credit with an unspecified limit maintained by the Company. Uncommitted lines of credit, amount outstanding Line of Credit Facility, Amount Outstanding Allowances on receivables from client Allowance for Doubtful Accounts Receivable Allowances on receivables from others Allowance for Doubtful Other Receivables, Current Accumulated depreciation and amortization, Fixed assets Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Accumulated amortization, Debt issuance costs Accumulated Amortization, Deferred Finance Costs Accumulated amortization, Intangible assets Finite-Lived Intangible Assets, Accumulated Amortization Common stock, par value Common Stock, Par or Stated Value Per Share Common stock, shares authorized Common Stock, Shares Authorized Common stock, shares issued Common Stock, Shares, Issued Treasury stock, shares Treasury Stock, Shares Financial assets and financial liabilities measured at fair value on a recurring basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Fair value inputs of significant Level 3 liabilities Fair Value Inputs, Liabilities, Quantitative Information [Table Text Block] Reconciliation of contingent consideration classified as a liability using significant unobservable inputs (Level 3) Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Consolidation Consolidation, Policy [Policy Text Block] Comprehensive Income Comprehensive Income, Policy [Policy Text Block] Use of Estimates Use of Estimates, Policy [Policy Text Block] Reportable Segment Segment Reporting, Policy [Policy Text Block] Fair Value of Financial Instruments Fair Value of Financial Instruments, Policy [Policy Text Block] Contingent Consideration Contingent Consideration [Policy Text Block] Disclosure of accounting policy for contingent consideration arrangements recognized in connection with a business combination, this policy represents a description of such arrangements. New Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Schedule of Restructuring and Related Costs [Table] Schedule of Restructuring and Related Costs [Table] Minimum [Member] Maximum [Member] Maximum [Member] Restructuring Cost and Reserve [Axis] Restructuring Type [Axis] Type of Restructuring [Domain] Type of Restructuring [Domain] Restructuring Charges [Member] Outsourcing and other related costs Outsourcing and Other Related Costs [Member] Outsourcing and Other Related Costs [Member] Technology transformation costs Technology Transformation Costs [Member] Technology Transformation Costs [Member] Employee severance obligations and other related costs Employee Severance [Member] Asset impairments (Note 4) Tangible Asset Impairment Charges [Member] Tangible Asset Impairment Charges [Member] Restructuring Related Costs Excluded from Total Restructuring Cost Estimate [Member] Restructuring Related Costs Excluded from Total Restructuring Cost Estimate [Member] Restructuring Related Costs Excluded from Total Restructuring Cost Estimate [Member] Restructuring Cost and Reserve [Line Items] Restructuring Cost and Reserve [Line Items] Restructuring Reserve [Roll Forward] Restructuring Reserve [Roll Forward] Accrued Balance, Beginning of Period Restructuring Reserve Costs incurred Restructuring and Related Cost, Incurred Cost Payments Restructuring Reserve, Settled with Cash Non-cash Restructuring Reserve, Settled without Cash Accrued Balance, End of Period Internally developed software and computer and networking equipment, expected to be capitalized Capitalized Software and Equipment, Expected Cumulative Cost Capitalized Software and Equipment, Expected Cumulative Cost Capitalized software and equipment, useful life Property, Plant and Equipment, Useful Life Payments for development activities Payments for Development Activities The cash outflow associated with the development or modification of software and computer and networking equipment for internal use (that is, not to be sold, leased or otherwise marketed to others) that qualify for capitalization. Capitalized software and equipment Capitalized Software and Equipment The gross amount of capitalized internally developed software and computer and networking equipment costs as of the balance sheet date. Document and Entity Information [Abstract] Entities [Table] Entities [Table] Entity Information [Line Items] Entity Information [Line Items] Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Document Type Document Type Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Amendment Flag Amendment Flag Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Fair Value Inputs, Liabilities, Quantitative Information [Table] Fair Value Inputs, Liabilities, Quantitative Information [Table] Fair Value, Liabilities, Quantitative Information [Line Items] Fair Value Inputs, Liabilities, Quantitative Information [Line Items] Fair Value at period end Fair Value Measurements, Valuation Technique Fair Value Measurements, Valuation Techniques Fair Value Measurements, Discount Rate Fair Value Inputs, Discount Rate Summary of borrowing activity in the revolving and uncommitted line of credit facilities Line of Credit Facility [Abstract] Average balance outstanding Line of Credit Facility, Average Outstanding Amount Weighted-average interest rate Long-term Debt, Weighted Average Interest Rate Brokers and Dealers [Abstract] Net Capital and Regulatory Requirements Regulatory Capital Requirements under Banking Regulations [Text Block] Stockholders' Equity Attributable to Parent [Abstract] Share Repurchase Program [Axis] Share Repurchase Program [Axis] Share Repurchase Program [Domain] Share Repurchase Program [Domain] August 2011 August 2011 [Member] August 2011 [Member] September 2012 September 2012 [Member] [Member] September 2012 [Member] [Member] Stock Repurchase Program, Authorized Amount Stock Repurchase Program, Authorized Amount Stock Repurchase Program, Remaining Authorized Repurchase Amount Stock Repurchase Program, Remaining Authorized Repurchase Amount Stock Repurchased During Period, Shares Stock Repurchased During Period, Shares Treasury Stock Acquired, Weighted-Average Cost Per Share Treasury Stock Acquired, Average Cost Per Share Stock Repurchased During Period, Value Stock Repurchased During Period, Value Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 1 [Member] Investments by Category [Axis] Gain on Investments, Including Investments Held at Cost [Domain] Gain (Loss) on Investments, Including Marketable Securities and Investments Held at Cost, Categories of Investments [Domain] Summary of amortized cost, gross unrealized gains and fair value of securities held-to-maturity Held To Maturity Securities [Abstract] Held to maturity securities. Amortized Cost Held-to-maturity Securities Gross Unrealized Gains Held-to-maturity Securities, Unrecognized Holding Gain Fair Value Held-to-maturity Securities, Fair Value Schedule of Intangible Assets by Major Class [Table] Schedule of Intangible Assets by Major Class [Table] Advisor and financial institution relationships [Member] Advisor And Financial Institution Relationships [Member] Advisor and financial institution relationships. Product sponsor relationships [Member] Product Sponsor Relationships [Member] Product sponsor relationships. Client relationships [Member] Customer Relationships [Member] Trade names [Member] Trade Names [Member] Indefinite-lived Intangible Assets by Major Class [Axis] Indefinite-lived Intangible Assets by Major Class [Axis] Indefinite-lived Intangible Assets, Major Class Name [Domain] Indefinite-lived Intangible Assets, Major Class Name [Domain] Trademark and trade name [Member] Trademark And Trade Name [Member] Trademark and trade name. Intangible Assets [Line Items] Intangible Assets [Line Items] Intangible Assets [Line Items] Weighted Average Life Remaining Acquired Finite-lived Intangible Assets, Weighted Average Useful Life Definite-lived intangible assets: Finite-Lived Intangible Assets, Net [Abstract] Gross Carrying Value Finite-Lived Intangible Assets, Gross Accumulated Amortization Net Carrying Value Indefinite-lived intangible assets: Net Carrying Value Indefinite-Lived Intangible Assets (Excluding Goodwill) The components of intangible assets Schedule Of Intangible Asset [Abstract] Schedule of intangible asset. Total intangible assets Intangible Assets, Net (Excluding Goodwill) Federal statutory income tax rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate Effective income tax rate Effective Income Tax Rate, Continuing Operations Earnings per Share Earnings Per Share [Text Block] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Asset Class [Axis] Asset Class [Axis] Fair Value by Asset Class [Domain] Fair Value by Asset Class [Domain] Fixed Assets [Member] Fixed Assets [Member] Fixed Assets [Member] Schedule of Trading Securities and Other Trading Assets, Major Types of Trading Securities and Assets [Axis] Major Types of Debt and Equity Securities [Axis] Major Types of Trading Securities and Assets [Domain] Major Types of Debt and Equity Securities [Domain] Money Market Funds [Member] Money Market Funds [Member] Mutual Funds [Member] Mutual Funds [Member] An investment vehicle that is made up of a pool of funds collected from many investors for the purpose of investing in securities such as stocks, bonds, money market instruments and similar assets. Mutual funds are operated by money managers, who invest the fund's capital and attempt to produce capital gains and income for the fund's investors. Equity Securities [Member] Equity Securities [Member] Debt Securities [Member] Debt Securities [Member] US Treasury Obligations [Member] US Treasury Securities [Member] Certificates of Deposit [Member] Certificates of Deposit [Member] Security Owned and Sold, Not yet Purchased, at Fair Value [Axis] Security Owned and Sold, Not yet Purchased, at Fair Value [Axis] Security Owned and Sold, Not yet Purchased Fair Value, Security Name [Domain] Security Owned and Sold, Not yet Purchased Fair Value, Security Name [Domain] Fair Value, Measurements, Nonrecurring [Member] Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, Level 2 [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Tangible Asset Impairment Charges Tangible Asset Impairment Charges Cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Securities owned-trading Trading Securities, Fair Value Disclosure Other assets Other Assets, Fair Value Disclosure Total assets at fair value Assets, Fair Value Disclosure, Recurring Securities sold, but not yet purchased Securities Sold, Not yet Purchased, Fair Value Disclosure Contingent consideration obligations Total liabilities at fair value Liabilities, Fair Value Disclosure Summary of changes in accrued restructuring expense balances Schedule of Restructuring and Related Costs [Table Text Block] Senior secured credit facilities Long-term Debt Fair value of indebtedness Debt Instrument, Fair Value Disclosure Dividends [Abstract] May 2012 - Special Dividend May 2012 [Member] May 2012 [Member] March 2013 March 2013 [Member] March 2013 [Member] Common Stock, Dividends, Per Share, Declared Common Stock, Dividends, Per Share, Declared Common Stock, Dividends, Per Share, Cash Paid Common Stock, Dividends, Per Share, Cash Paid Dividends Payable Dividends, Common Stock, Cash Summary of amortized cost, gross unrealized gains and fair value of securities held-to-maturity Held-to-maturity Securities [Table Text Block] Maturities of securities held-to-maturity Investments Classified by Contractual Maturity Date [Table Text Block] Stockholders' Equity Note [Abstract] Stockholders' Equity Stockholders' Equity Note Disclosure [Text Block] Subsequent Events [Abstract] Subsequent Event Subsequent Events [Text Block] Antidilutive securities excluded from computation of Earnings per Share amount Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Statement of Financial Position [Abstract] ASSETS Assets [Abstract] Cash and cash equivalents Cash and securities segregated under federal and other regulations Cash and Securities Segregated under Federal and Other Regulations Receivables from: Receivables [Abstract] Clients, net of allowance of $544 at March 31, 2013 and $587 at December 31, 2012 Receivables from Customers Product sponsors, broker-dealers and clearing organizations Receivables from Brokers-Dealers and Clearing Organizations Others, net of allowance of $6,838 at March 31, 2013 and $6,675 at December 31, 2012 Other Receivables, Net, Current Securities owned: Securities Owned Abstract Securities owned: Trading — at fair value Trading Securities Held-to-maturity Securities borrowed Securities Borrowed Income taxes receivable Income Taxes Receivable Fixed assets, net of accumulated depreciation and amortization of $275,186 at March 31, 2013 and $324,684 at December 31, 2012 Property, Plant and Equipment, Net Debt issuance costs, net of accumulated amortization of $6,024 at March 31, 2013 and $4,903 at December 31, 2012 Deferred Finance Costs, Net Goodwill Goodwill Intangible assets, net of accumulated amortization of $237,055 at March 31, 2013 and $237,681 at December 31, 2012 Other assets Other Assets Total assets Assets LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities and Equity [Abstract] LIABILITIES: Liabilities [Abstract] Drafts payable Drafts Payable Payables to clients Payables to Customers Payables to broker-dealers and clearing organizations Payables to Broker-Dealers and Clearing Organizations Accrued commission and advisory expenses payable Accrued Commissions And Advisory Fees Payable Balance of accrued commissions, recruiting bonus accruals, and other commissions payable. Accounts payable and accrued liabilities Accounts Payable and Accrued Liabilities Income taxes payable Taxes Payable Unearned revenue Deferred Revenue, Current Securities sold, but not yet purchased — at fair value Senior secured credit facilities Deferred income taxes — net Deferred Tax Assets, Net Total liabilities Liabilities STOCKHOLDERS' EQUITY: Common stock, $.001 par value; 600,000,000 shares authorized; 116,072,065 shares issued at March 31, 2013 and 115,713,741 shares issued at December 31, 2012 Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital, Common Stock Treasury stock, at cost — 9,577,089 shares at March 31, 2013 and 9,421,800 shares at December 31, 2012 Treasury Stock, Value Retained earnings Retained Earnings (Accumulated Deficit) Total stockholders' equity Total liabilities and stockholders' equity Liabilities and Equity Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies [Table] Commitments and Contingencies [Table] Commitments and Contingencies [Table] Collateral Received from Client by Third Party Pledge Recipient [Axis] Collateral Received from Client by Third Party Pledge Recipient [Axis] Collateral Received from Client by Third Party Pledge Recipient [Axis] Pledge Recipient [Domain] Pledge Recipient [Domain] Pledge Recipient [Domain] Options Clearing Corporation [Member] Options Clearing Corporation [Member] Options Clearing Corporation [Member] National Securities Clearing Corporation [Member] National Securities Clearing Corporation [Member] National Securities Clearing Corporation [Member] Commitments and Contingencies [Line Items] Commitments and Contingencies [Line Items] Commitments and Contingencies [Line Items] Operating leases rental expense Operating Leases, Rent Expense, Net Minimum sublease rental income Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals Other Commitments [Abstract] Other Commitments [Abstract] Other Commitments [Abstract] Collateral security Customer Securities for which Entity has Right to Sell or Repledge, Fair Value Fair value of securities received as collateral that have been resold or repledged Customer Securities for which Entity has Right to Sell or Repledge, Fair Value of Securities Sold or Repledged Collateral security pledged in bank Collateral Security Pledged In Bank Collateral security pledged to bank in connection with unutilized secured margin lines of credit. Collateral security remaining unpledged Customer Securities for which Entity has Right to Sell or Repledge, Remaining Unpledged Amount Customer Securities for which Entity has Right to Sell or Repledge, Remaining Unpledged Amount Total remaining collateral security Fair Value of Securities Received as Collateral that Can be Resold or Repledged Receivables from clearing organizations Receivables from Clearing Organizations Held-to-Maturity Securities Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Outstanding borrowings Long-term Debt, by Current and Noncurrent [Abstract] Senior secured term loans: Senior Secured Term Loan [Abstract] Senior secured term loan abstract. Balance Secured Debt Interest Rate, Stated Percentage Debt Instrument, Interest Rate, Stated Percentage Less current borrowings (maturities within 12 months) Long-term Debt, Current Maturities Long-term borrowings - net of current portion Long-term Debt, Excluding Current Maturities Components of intangible assets Schedule of Intangible Assets and Goodwill [Table Text Block] Amortization expense Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Indebtedness Debt Disclosure [Text Block] Summary of minimum calendar year payments and maturities of the senior secured borrowings Maturities of Long-term Debt [Abstract] 2013 - remainder Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year 2014 Long-term Debt, Maturities, Repayments of Principal in Year Two 2015 Long-term Debt, Maturities, Repayments of Principal in Year Three 2016 Long-term Debt, Maturities, Repayments of Principal in Year Four 2017 Long-term Debt, Maturities, Repayments of Principal in Year Five Thereafter Long-term Debt, Maturities, Repayments of Principal after Year Five Total 2013 - remainder Operating Leases, Future Minimum Payments Due, Next Twelve Months 2014 Operating Leases, Future Minimum Payments, Due in Two Years 2015 Operating Leases, Future Minimum Payments, Due in Three Years 2016 Operating Leases, Future Minimum Payments, Due in Four Years 2017 Operating Leases, Future Minimum Payments, Due in Five Years Thereafter Operating Leases, Future Minimum Payments, Due Thereafter Total Operating Leases, Future Minimum Payments Due Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Award Type [Axis] Award Type [Axis] Award Type [Domain] Award Type [Domain] Employee Stock Option Awards [Member] Employee Stock Option Awards [Member] An arrangement whereby an employee is entitled to receive in the future, subject to vesting and other restrictions, a number of shares in the entity at a specified price, as defined in the agreement. Although there are variations, normally, after vesting, when an option is exercised, the employee-holder pays the strike value in cash to the issuing employer-entity and receives equity shares. The equity shares can be sold into the market for cash at the current market price without restriction. Options may be used to attract, retain and incentivize employees, in addition to their regular salary and other benefits. Advisors And Financial Institutions [Member] Advisors And Financial Institutions [Member] Advisors and financial institutions. Restricted Stock [Member] Restricted Stock [Member] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] Nonqualified Deferred Compensation Plan [Member] Nonqualified Deferred Compensation Plan [Member] Nonqualified Deferred Compensation Plan. Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Share Based Compensation Arrangement By Share Based Payment Award Shares Reserved Share Based Compensation Arrangement By Share Based Payment Award Shares Reserved Share based compensation arrangement by share based payment award shares reserved. Share-based compensation: Share-based Compensation [Abstract] Share-based compensation - options and warrants Allocated Share-based Compensation Expense Share-based compensation cost unrecognized Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized Non-vested compensation cost weighted-average period Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 2008 Nonqualified deferred compensation plan: Deferred Compensation Arrangements [Abstract] Common shares distributed, net of shares withheld to satisfy withholding tax requirements Stock Issued During Period, Shares, New Issues Treasury stock purchases, shares Treasury stock purchases Outstanding borrowings Schedule of Long-term Debt Instruments [Table Text Block] Summary of borrowing activity in the revolving and uncommitted line of credit facilities Schedule of Line of Credit Facilities [Table Text Block] Summary of minimum calendar year payments and maturities of the senior secured borrowings Schedule of Maturities of Long-term Debt [Table Text Block] Schedule of Net Capital and Net Capital Requirements for Company's Broker-Dealer Subsidiaries [Table] Schedule of Net Capital and Net Capital Requirements for Company's Broker-Dealer Subsidiaries [Table] Schedule of net capital and net capital requirements for the Company's broker-dealer subsidiaries. LPL Financial LLC [Member] Lpl Financial Llc [Member] LPL Financial LLC Schedule of Net Capital and Net Capital Requirements for Company's Broker-Dealer Subsidiaries [Line Items] Schedule of Net Capital and Net Capital Requirements for Company's Broker-Dealer Subsidiaries [Line Items] Schedule of net capital and net capital requirements for company's broker-dealer subsidiaries. Net capital and net capital requirements for the Company's broker-dealer subsidiaries Regulatory Capital Requirements [Abstract] Net Capital Net Capital Minimum Net Capital Required Minimum Net Capital Required for Broker-Dealer Subsidiary Excess Net Capital Alternative Excess Net Capital Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Intangible Assets Intangible Assets Disclosure [Text Block] Restructuring Restructuring and Related Activities Disclosure [Text Block] Fair Value Measurements Fair Value Disclosures [Text Block] Future minimum payments under leases, lease commitments and other non cancellable contractual obligations Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Schedule of Treasury Stock by Class [Table Text Block] Schedule of Treasury Stock by Class [Table Text Block]