Intangible Assets, Net -- None. No documentation exists for this element. -- Intangible Assets, Net Intangible Assets Disclosure [Text Block] Estimated Future Amortization Expenses for Intangible Assets [Abstract] 2015 Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 2016 Finite-Lived Intangible Assets, Amortization Expense, Year Two 2017 Finite-Lived Intangible Assets, Amortization Expense, Year Three Total estimated future amortization expense Finite-Lived Intangible Assets, Net Consolidated Statements of Operations [Abstract] [Abstract] Consolidated Statements of Operations [Abstract] [Abstract] Statement [Table] Statement [Table] Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Statement [Line Items] Statement [Line Items] Revenue Revenues Cost of revenue Cost of Revenue Selling, general and administrative expenses Selling, General and Administrative Expense (Gain) loss on sale of patent assets, net Gain (Loss) on Disposition of Other Assets Operating income Operating Income (Loss) Other income (expense), net Other Nonoperating Income (Expense) Income before provision for income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Provision for income taxes Income Tax Expense (Benefit) Net income Net Income (Loss) Attributable to Parent Net income available to common stockholders: Net income available to common stockholders: [Abstract] Basic Net Income (Loss) Available to Common Stockholders, Basic Diluted Net Income (Loss) Available to Common Stockholders, Diluted Net income available to common stockholders per common share: Net income per common share: [Abstract] Basic Earnings Per Share, Basic Diluted Earnings Per Share, Diluted Weighted-average shares used in computing net income available to common stockholders per common share: Weighted-average shares used in computing net income per common share: [Abstract] Basic Weighted Average Number of Shares Outstanding, Basic Diluted Weighted Average Number of Shares Outstanding, Diluted Goodwill Disclosure [Abstract] -- None. No documentation exists for this element. -- Goodwill Goodwill Disclosure [Text Block] Changes In The Carrying Amounts Of Goodwill Schedule of Goodwill [Table Text Block] Fair Value Disclosures [Abstract] Schedule of financial assets and liabilities measured at fair value on a recurring basis Fair Value, Assets Measured on Recurring Basis [Table Text Block] Anti-Dilutive Securities Not Included In Diluted Shares Outstanding Calculation [Abstract] -- None. No documentation exists for this element. -- Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Weighted-average anti-dilutive securities [Domain] Antidilutive Securities, Name [Domain] Stock options outstanding Employee Stock Option [Member] Restricted stock units outstanding Restricted Stock [Member] Shares of common stock subject to repurchase Common Stock Subjectto Repurchase [Member] Weighted-average: Weighted-average: [Abstract] Weighted-average anti-dilutive securities Weighted-Average Anti-Dilutive Securities Weighted-average anti-dilutive securities not included in the calculation for diluted shares outstanding Property and Equipment, Net [Abstract] Schedule of Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Property, Plant and Equipment, type [Axis] Property, Plant and Equipment, Type [Axis] Property and equipment, type [Domain] Property, Plant and Equipment, Type [Domain] Internal-use software Software Development [Member] Leasehold improvements Leasehold Improvements [Member] Computer, equipment and software Computer Equipment [Member] Furniture and fixtures Furniture and Fixtures [Member] Construction-in-progress Asset under Construction [Member] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Internal-use software Capitalized Computer Software, Gross Leasehold improvements Leasehold Improvements, Gross Computer, equipment and software Machinery and Equipment, Gross Furniture and fixtures Furniture and Fixtures, Gross Construction-in-progress Construction in Progress, Gross Total property, plant 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, net Property, Plant and Equipment, Net Subsequent Events [Abstract] Subsequent Events Subsequent Events [Text Block] Schedule of Acquired Finite-Lived Intangible Asset by Major Class [Table] Schedule of Acquired Finite-Lived Intangible Asset by Major Class [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] Intangible Assets Net Intangible Assets Net [Member] Acquired Finite-Lived Intangible Assets [Line Items] Acquired Finite-Lived Intangible Assets [Line Items] Intangible Assets, Net Schedule of Finite-Lived Intangible Assets [Table Text Block] Expected Future Annual Amortization Of Intangible Assets Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Accrued and Other Current Liabilities -- None. No documentation exists for this element. -- Accrued And Other Current Liabilities Accounts Payable, Accrued Liabilities, and Other Liabilities Disclosure, Current [Text Block] Stock-Based Compensation -- None. No documentation exists for this element. -- Activity Under Equity Settled Award Plans And Related Information Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] Restricted Stock Unit Activity Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] Weighted-Average Assumptions Used To Estimate The Fair Value Of Stock Options Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Weighted-Average Assumptions Used To Estimate The Fair Value Of PBRSUs Schedule of Assumptions Used [Table Text Block] Commitments and Contingencies [Abstract] Commitments and Contingencies [Abstract] 2015 Operating Leases, Future Minimum Payments Due, Next Twelve Months 2016 Operating Leases, Future Minimum Payments, Due in Two Years 2017 Operating Leases, Future Minimum Payments, Due in Three Years 2018 Operating Leases, Future Minimum Payments, Due in Four Years Total future non-cancelable minimum lease payments Operating Leases, Future Minimum Payments Due Less: minimum payments to be received from non-cancelable subleases Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals Total future non-cancelable minimum operating lease payments, net Future non-cancelable minimum operating lease payments, net Future non-cancelable minimum operating lease payments, net Stockholder's Equity Stockholders' Equity Note Disclosure [Text Block] Net Income Available to Common Stockholders -- None. No documentation exists for this element. -- Net Income Available to Common Stockholders Earnings Per Share [Text Block] Amortization of intangible assets Amortization of Intangible Assets 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] Retained Earnings (Accumulated Deficit) Retained Earnings [Member] Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] Balance, shares Shares, Outstanding Balance Stockholders' Equity Attributable to Parent Net income Unrealized gain (loss) on available-for-sale securities, net of tax Available-for-sale Securities, Change in Net Unrealized Holding Gain (Loss), Net of Tax Issuance of common stock upon exercise of stock options, vesting of restricted stock units and other common stock issuances, shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Issuance of common stock upon exercise of stock options, vesting of restricted stock units and other common stock issuances Stock Issued During Period, Value, Stock Options Exercised Issuance of Common Stock Related to Business Acquisition, Shares Stock Issued During Period, Shares, Acquisitions Issuance of Common Stock Related to Business Acquisition Stock Issued During Period, Value, Acquisitions Vesting of stock options early exercised Vesting of Stock Options Early Exercised Vesting of stock options early exercised. Stock-based compensation Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Tax benefit of equity award deductions Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation Repurchase of common stock, shares Stock Repurchased During Period, Shares Payments for Repurchase of Common Stock Payments for Repurchase of Common Stock Stock Repurchased During Period, Value Stock Repurchased During Period, Value Tax withholdings related to net share settlements of restricted stock units Increase (Decrease) in Tax withholdings related to net share settlements of restricted stock units Increase (Decrease) in Tax withholdings related to net share settlements of restricted stock units Balance, shares Balance Consolidated Statements of Comprehensive Income [Abstract] Consolidated Statements of Comprehensive Income [Abstract] [Abstract] Other comprehensive income, net of tax: Other comprehensive income, net of tax: [Abstract] Unrealized gains (losses) on available-for-sale securities: Unrealized losses on available-for-sale securities: [Abstract] Unrealized holding gains (losses) arising during the period Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax Less: reclassification adjustment for (gains) losses included in net income Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax Net unrealized gains (losses) on available-for-sale securities, net of tax Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Income Tax [Abstract] Income Tax [Abstract] Balance as of January 1, Unrecognized Tax Benefits Gross increase related to current period tax positions Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions Gross decrease related to prior period tax positions Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions Balance as of December 31, Stock Option Plan Summary [Abstract] 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] Equity Award [Domain] Vested and exercisable Vestedand Exercisable [Member] Vested and expected to vest Vestedand Expectedto Vest [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Outstanding (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Outstanding (in shares) Outstanding (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Outstanding (in shares) Outstanding (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Outstanding (in dollars per share) Shares authorized (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized Options exercised (in shares) Options exercised (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Options forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Options forfeited (in shares) Options forfeited (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Restricted stock units withheld related to net share settlement of restricted stock units (in shares) Restricted stock units granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Restricted stock units forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Outstanding (weighted-average contractual life) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Outstanding (intrinsic value) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Vested and exercisable (shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Vested and exercisable (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price Vested and exercisable (weighted-average contractual life) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Vested and exercisable (intrinsic value) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Vested and expected to vest (shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number Vested and expected to vest (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price Vested and expected to vest (weighted-average contractual life) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term Vested and expected to vest (intrinsic value) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value Income Tax Disclosure [Abstract] Income Tax Contingency [Table] Income Tax Contingency [Table] New Accounting Pronouncement, Early Adoption [Axis] New Accounting Pronouncement, Early Adoption [Axis] New Accounting Principles, Early Adoption [Domain] New Accounting Principles, Early Adoption [Domain] New Accounting Pronouncement, Early Adoption, Effect [Member] New Accounting Pronouncement, Early Adoption, Effect [Member] Income Tax Contingency [Line Items] Income Tax Contingency [Line Items] Deferred Tax Assets, Valuation Allowance Deferred Tax Assets, Valuation Allowance Deferred Tax Assets, Net Deferred Tax Assets, Net Deferred Tax Liabilities, Net Deferred Tax Liabilities, Net Net operating loss carryforwards Operating Loss Carryforwards Unrecognized tax benefits Interest and penalties associated with unrecognized tax benefits Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued Commitments and Contingencies Disclosure -- None. No documentation exists for this element. -- Loss Contingencies [Table] Loss Contingencies [Table] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Fair Value, Inputs, Level 3 [Member] Fair Value, Inputs, Level 3 [Member] Liability Class [Axis] Liability Class [Axis] Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] Other Debt Obligations [Member] Other Debt Obligations [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Maximum Maximum [Member] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Area of real estate property (in square feet) Area of Real Estate Property Monthly base rent payments Payments for Rent Operating Leases, Income Statement, Sublease Revenue Operating Leases, Income Statement, Sublease Revenue Rent expense related to non-cancelable operating leases Operating Leases, Rent Expense Proceeds from Deferred Payment Obligations Proceeds from Deferred Payment Obligations Proceeds from Deferred Payment Obligations Debt Instrument, Repayable Upon Redemption, Preferred Stock Debt Instrument, Repayable Upon Redemption, Preferred Stock Debt Instrument, Repayable Upon Redemption, Preferred Stock Debt Instrument, Amortized Cost Debt Instrument, Amortized Cost Debt Instrument, Amortized Cost Debt Instrument, Fair Value Disclosure Debt Instrument, Fair Value Disclosure Fair Value, Debt Instrument, Valuation Techniques, Change in Technique, Quantification of Effect Fair Value, Debt Instrument, Valuation Techniques, Change in Technique, Quantification of Effect Payments for loans Payments for Loans Deferred payment obligation Deferred Payment Obligation, Portion Settled, Carrying Value Deferred Payment Obligation, Portion Settled, Carrying Value Payment of deferred payment obligation Deferred Payment Obligation, Portion Settled, Settlement Value Deferred Payment Obligation, Portion Settled, Settlement Value Gain on extinguishment Gains (Losses) on Extinguishment of Debt Carrying value of equity securities transferred Nonmonetary Transaction, Transferred Security, at Carrying Value Nonmonetary Transaction, Transferred Security, Carrying Value Loss recognized Nonmonetary Transaction, Gain (Loss) Recognized on Transfer Loss Contingency, Number of Defendants Loss Contingency, Number of Defendants Number of active insurance policies Number of Active Insurance Policies The number of active insurance policies as of the Company's balance sheet date. Reserves for known and incurred but not reported claims Liability for Unpaid Claims and Claims Adjustment Expense, Incurred but Not Reported (IBNR) Claims, Amount Commitments and Contingencies Disclosure [Abstract] Aggregate Future Non-Cancelable Minimum Lease Payments For Operating Leases Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] Basis Of Presentation And Significant Accounting Policies Significant Accounting Policies [Text Block] Financial Instruments Fair Value Disclosures [Text Block] Equity Share Repurchase [Abstract] Equity Share Repurchase [Abstract] Share Repurchase Utilized Share Repurchase Utilized Share Repurchase Utilized Stock Repurchased, Accumulated, Weighted Average Price Stock Repurchased, Accumulated, Weighted Average Price Stock Repurchased, Accumulated, Weighted Average Price Stock Repurchased, Accumulated Value Stock Repurchased, Accumulated Value Stock Repurchased, Accumulated Value Stock Repurchased and Retired During Period, Shares Stock Repurchased and Retired During Period, Shares Stock Repurchased During Period Weighted Average Price Stock Repurchased During Period Weighted Average Price Stock Repurchased During the Period Weighted Average Price per Share Stock Repurchased During Period, Value Property and Equipment, Net -- None. No documentation exists for this element. -- Property And Equipment, Net Property, Plant and Equipment [Table Text Block] Property and equipment, types Property, Plant and Equipment, Other Types [Member] Capitalized Stock Based Compensation [Axis] Income Statement Location [Axis] Capitalized Stock Based Compensation Expense [Domain] Income Statement Location [Domain] Internal-use software Internal Use Software [Member] Depreciation and amortization expense Depreciation, Depletion and Amortization Stock-based compensation capitalized as part of internal-use software Capitalized Stock Based Compensation Expense Stock-based compensation capitalized as part of the cost of internal-use software Basis Of Presentation And Significant Accounting Policies [Table] Basis of Presentation and Significant Accounting Policies [Table] Basis of Presentation and Significant Accounting Policies [Table] Weighted Average Weighted Average [Member] Minimum Minimum [Member] Patents Patents [Member] Major Customers [Axis] Customer [Axis] Name of Major Customer [Domain] Customer [Domain] Client One Client One [Member] Client One [Member] Client Two Client Two [Member] Client Two [Member] Client Three Client Three [Member] Client Three [Member] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Accounts receivable Accounts Receivable [Member] Sales Revenue, Subscription Fee Sales Revenue, Subscription Fee [Member] Sales Revenue, Subscription Fee Basis of Presentation and Significant Accounting Polcies [Line Items] Basis of Presentation and Significant Accounting Policies [Line Items] Basis of Presentation and Significant Accounting Policies [Line Items] Deferred Tax Assets, Gross, Current Other than Temporary Impairment Losses, Investments Other than Temporary Impairment Losses, Investments BESP 5pct of Revenue BESP 5pct of Revenue Customer revenue of 5% used in BESP calculation Property, Plant and Equipment, Useful Life Property, Plant and Equipment, Useful Life Number of Significant Clients Number of Significant Clients Number of Significant Clients Restricted cash (current and non-current) Restricted Cash and Cash Equivalents Concentration of credit risk, percentage Concentration Risk, Percentage Capitalization of internal-use sofware and website development costs Capitalized Computer Software, Additions Amortization of internal-use sofware and website development costs Capitalized Computer Software, Amortization Patent assets, useful life Finite-Lived Intangible Asset, Useful Life Expected Future Annual Amortization Expense of Patent Assets [Abstract] Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] 2018 Finite-Lived Intangible Assets, Amortization Expense, Year Four 2019 Finite-Lived Intangible Assets, Amortization Expense, Year Five Total estimated future amortization expense Patent assets, net Carrying amount of finite-lived patent assets after accumulated amortization as of the balance sheet date of the costs pertaining to the exclusive legal rights granted to the owner to exploit an invention or a process for a period of time specified by law. Such costs may have been expended to directly apply and receive patent rights, or to acquire such rights. Employee Savings Plan [Abstract] Employee Benefits [Abstract] Defined Contribution Plan, Participation wait Period Defined Contribution Plan, Participation Wait Period Defined Contribution Plan, Participation Wait Period Maximum employer contribution Defined Contribution Plan, Maximum Annual Contributions Per Employee, Amount Total matching contribution Defined Contribution Plan, Cost Recognized Accrued And Other Current Liabilities Schedule of Accounts Payable and Accrued Liabilities [Table Text Block] Segment Reporting -- None. No documentation exists for this element. -- Segment Reporting Segment Reporting Disclosure [Text Block] Weighted Average Fair Value Assumptions for Stock-Based Compensation [Abstract] Stock options Performance-based restricted stock units with a market condition Performance Shares [Member] Document Period End Date Document Period End Date Dividend yield Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Risk-free rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Expected volatility Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Expected term (in years) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Grant date fair value Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Statement of Financial Position [Abstract] Preferred Stock, Value, Issued Preferred Stock, Value, Issued Assets Assets [Abstract] Current assets: Current assets: [Abstract] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Short-term investments Short-term Investments Restricted cash Restricted Cash and Cash Equivalents, Current Accounts receivable Accounts Receivable, Gross, Current Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Deferred tax assets Deferred Tax Assets, Gross, Current Deferred Tax Assets, Net Total current assets Assets, Current Patent assets, net Property and equipment, net Intangible assets, net Intangible Assets, Net (Excluding Goodwill) Goodwill Goodwill Restricted cash, less current portion Restricted Cash and Cash Equivalents, Noncurrent Other assets Other Assets, Noncurrent Deferred Tax Assets, Net, Noncurrent Deferred Tax Assets, Net, Noncurrent Total assets Assets Liabilities and stockholders' equity Liabilities and Equity [Abstract] Current liabilities: Current liabilities: [Abstract] Accounts payable Accounts Payable, Current Accrued liabilities Accrued Liabilities, Current Deferred revenue Deferred Revenue, Current Deferred payment obligations Other Long-term Debt, Current Other current liabilities Other Liabilities, Current Total current liabilities Liabilities, Current Deferred revenue, less current portion Deferred Revenue, Noncurrent Other liabilities Other Liabilities, Noncurrent Total liabilities Liabilities Common stock Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital Retained earnings Retained Earnings (Accumulated Deficit) Accumulated other comprehensive income (loss) Accumulated Other Comprehensive Income (Loss), Net of Tax Total stockholders' equity Total liabilities and stockholders' equity Liabilities and Equity Revenue by Location and Generated by Country [Abstract] Geographical [Axis] Geographical [Axis] Segment, Geographical [Domain] Geographical [Domain] United States UNITED STATES Korea KOREA, REPUBLIC OF Japan JAPAN Other Other Country [Member] United States (in dollars) United States Country of Domicile Percent of Total Revenue Country Of Domicile Percent Of Total Revenue Other foreign country Foreign Country Percent of Total Revenue Foreign Country Percent Of Total Revenue Total revenue (in dollars) Total revenue Percent of Total Revenue Percent of Total Revenue Current Current Income Tax Expense (Benefit), Continuing Operations [Abstract] Federal Current Federal Tax Expense (Benefit) State Current State and Local Tax Expense (Benefit) Foreign Current Foreign Tax Expense (Benefit) Total current provision for income taxes Current Income Tax Expense (Benefit) Deferred Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] Federal Deferred Federal Income Tax Expense (Benefit) State Deferred State and Local Income Tax Expense (Benefit) Total deferred provision for income taxes Total Deferred Income Tax Expense Benefit The component of income tax expense for the period representing the net change in deferred tax assets and liabilities of continuing operations. Total provision for income taxes Revenue By Location Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Minimum Fair Value Hierarchy [Domain] Level 3 Other Debt Obligations 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] Current Fiscal Year End Date Current Fiscal Year End Date Losses in other income (expense) Gain (Loss) on Sale of Investments Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net Percentage of marketable security investments that mature in one year Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value, Percentage Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value, Percentage Maturity period Available-for-sale Securities, Debt Maturities, Next Twelve Months, Maturity Term Available-for-sale Securities, Debt Maturities, Next Twelve Months, Maturity Term Percentage of marketable security investments that mature within one to five years Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value, Percentage Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value, Percentage Maturity period, year two through five Available for sale Securities, Debt Maturities, Year Two Through Five, Fair Value, Maturity Term Available for sale Securities, Debt Maturities, Year Two Through Five, Fair Value, Maturity Term Short-term cost method investments Cost Method Investments Funding from a syndicate participant Fair value of loan from syndicate participant Common stock, par value per share (in dollars per share) Common Stock, Par or Stated Value Per Share Common stock authorized (in shares) Common Stock, Shares Authorized Common stock issued (in shares) Common Stock, Shares, Issued Common stock outstanding (in shares) Common Stock, Shares, Outstanding Preferred stock par value per share (in dollars per share) Preferred Stock, Par or Stated Value Per Share Preferred shares authorized (in shares) Preferred Stock, Shares Authorized Preferred Stock, Shares Issued Preferred Stock, Shares Issued Preferred Stock, Shares Outstanding Preferred Stock, Shares Outstanding Cash and Cash Equivalents [Axis] Cash and Cash Equivalents [Axis] Cash and Cash Equivalents [Domain] Cash and Cash Equivalents [Domain] U.S. government and agency securities US Government Corporations and Agencies Securities [Member] Commercial paper Commercial Paper [Member] Municipal bonds Municipal Bonds [Member] Money market funds Money Market Funds [Member] Investment Type [Axis] Investment Type [Axis] Investments [Domain] Investments [Domain] Corporate bonds Corporate Bond Securities [Member] Equity securities Equity Securities [Member] Deferred payment obligations Level 1 Fair Value, Inputs, Level 1 [Member] Level 2 Fair Value, Inputs, Level 2 [Member] Level 3 Assets: Cash equivalents: Cash and Cash Equivalents, Fair Value Disclosure Short-term investments: Investments, Debt and Equity Securities [Abstract] Short-term investments amortized cost Available-for-sale Securities, Amortized Cost Basis Short-term investments unrealized gains Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax Short-term investments unrealized losses Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax Estimated fair value Available-for-sale Securities Short-term investments fair value levels Investments, Fair Value Disclosure Liabilities: Liabilities [Abstract] Current liabilities: Liabilities, Current [Abstract] Deferred payment obligations amortized costs Deferred payment obligations unrealized gains Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax Deferred payment obligations fair value Related-Party Transactions -- None. No documentation exists for this element. -- Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Related Party [Axis] Related Party [Axis] Related Party [Domain] Related Party [Domain] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Number of Directors That Also Served On Client Boards Number of Directors That Also Served On Client Boards Number of Directors That Also Served On Client Boards Subscription fee revenue from related party transaction Related Party Transaction, Amounts of Transaction Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party Receivables due from related parties Accounts Receivable, Related Parties, Current Commitments And Contingencies Commitments and Contingencies Disclosure [Text Block] Deferred tax assets: Deferred Tax Assets, Net of Valuation Allowance, Current Classification [Abstract] Deferred revenue Deferred Tax Assets, Deferred Income Reserves and other Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Other Stock-based compensation Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost Deferred Tax Assets, Goodwill and Intangible Assets Deferred Tax Assets, Goodwill and Intangible Assets Total deferred tax assets Deferred Tax Assets, Gross Valuation allowance Net deferred tax assets Deferred Tax Assets, Net of Valuation Allowance Deferred tax liabilities: Deferred Tax Liabilities, Net, Classification [Abstract] Depreciation and amortization Deferred Tax Liabilities, Goodwill and Intangible Assets Net deferred taxes Subsidiary, Sale of Stock [Axis] Sale of Stock [Axis] Sale of Stock, Name of Transaction [Domain] Sale of Stock [Domain] Initial Public Offering IPO [Member] Secondary Offering Secondary Offering [Member] Secondary offering. Stock issuance costs Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs Issuance price of common stock Sale of Stock, Price Per Share Patent Assets, Net [Abstract] Change in Patent Assets [Axis] Change in Patent Assets [Axis] -- None. No documentation exists for this element. -- Change in Patent Assets [Domain] ChangeinIntangibleAssets [Domain] -- None. No documentation exists for this element. -- Additions Additions [Member] Dispositions Sale Intangibles [Member] Patent assets Finite-Lived Intangible Assets, Gross Accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Basic and Diluted Net Income Per Share Available To Common Stockholders Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Anti-Dilutive Securities Not Included In Diluted Shares Outstanding Calculation Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Use of Estimates Use of Estimates, Policy [Policy Text Block] Revenue Recognition Revenue Recognition, Policy [Policy Text Block] Accounting fo Payments to Clients Revenue Recognition, Incentives [Policy Text Block] Deferred Revenue Revenue Recognition, Deferred Revenue [Policy Text Block] Accounts Receivable Trade and Other Accounts Receivable, Policy [Policy Text Block] Concentration of Risk Concentration Risk, Credit Risk, Policy [Policy Text Block] Fair Value Measurements Fair Value of Financial Instruments, Policy [Policy Text Block] Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Short-Term Investments Investment, Policy [Policy Text Block] Property and Equipment Property, Plant and Equipment, Policy [Policy Text Block] Internal-Use Software and Website Development Costs Internal Use Software, Policy [Policy Text Block] Patent Assets, Net Patent Assets [Policy Text Block] Disclosure of accounting policy for patent assets which which may include the basis of such assets, amortization methods used and estimated useful lives. Impairment of Long-Lived Assets Impairment or Disposal of Long-Lived Assets, Including Intangible Assets, Policy [Policy Text Block] Goodwill Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block] Intangible Assets, Net Goodwill and Intangible Assets, Intangible Assets, Policy [Policy Text Block] Advertising Costs Advertising Costs, Policy [Policy Text Block] Foreign Currency Accounting Foreign Currency Transactions and Translations Policy [Policy Text Block] Income Taxes Income Tax, Policy [Policy Text Block] Stock-Based Compensation Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] Business Combinations Business Combinations Policy [Policy Text Block] Reserves for Known and Incurred but not Reported Claims Unpaid Policy Claims and Claims Adjustment Expense, Policy [Policy Text Block] Recently Adopted Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] Quarterly Financial Information Disclosure (Unaudited) [Abstract] Quarterly Financial Information Disclosure (Unaudited) [Abstract] Selected Quarterly Financial Information (Unaudited) Schedule of Quarterly Financial Information [Table Text Block] Income Taxes Income Tax Disclosure [Text Block] Domestic Income (Loss) from Continuing Operations before Income Taxes, Domestic International Income (Loss) from Continuing Operations before Income Taxes, Foreign Total income before income tax provision Restricted Stock Units Activity [Abstract] Performance Shares [Member] Restricted stock units granted Restricted Stock Units Granted [Member] Restricted stock units vested Restricted Stock Units Vested [Member] Restricted stock units forfeited Restricted Stock Units Forfeited [Member] Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted Non-vested units (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Non-vested units (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 Granted (in shares) Granted (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 Vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 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 Forfeited (in shares) 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 Non-vested units (in shares) Non-vested units (in dollars per share) Share-based compensation arrangement by share-based payment award, equity instruments other than options, nonvested, intrinsic value Aggregate Instrinsic Value of Non-Vested Restricted Stock Units Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other Than Options, Outstanding, Intrinsic Value Intangible Assets, Net [Abstract] Proprietary data and models Proprietary Business Processes [Member] Trademarks Trademarks [Member] Developed technology Developed Technology Rights [Member] Customer relationships Customer Relationships [Member] Covenant not to compete Noncompete Agreements [Member] Carrying amount Net carrying amount Nature of Business -- None. No documentation exists for this element. -- Nature Of Business Nature of Operations [Text Block] Title of Individual [Axis] Title of Individual [Axis] Relationship to Entity [Domain] Relationship to Entity [Domain] Newly hired employees Newly hired employees [Member] Newly hired employees [Member] Existing employees Existing employees [Member] Existing employees [Member] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] 2011 and 2008 Plan 2011 and 2008 Plan [Member] 2011 and 2008 Plan [Member] 2011 Plan 2011 Plan [Member] 2011 Plan [Member] 2008 Plan 2008 Plan [Member] 2008 Plan [Member] Incentive stock options Incentive stock options [Member] Incentive stock options [Member] Restricted stock Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Preferred shares authorized (in shares) Preferred stock par value per share (in dollars per share) Common stock reserved for future issuance (in shares) Common Stock, Capital Shares Reserved for Future Issuance Share-based Compensation Arrangement by Share-based Payment Award, Grant Exercise Price, Percent of Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Grant Exercise Price, Percent of Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Grant Exercise Price, Percent of Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Share-based Compensation Arrangement by Share-based Payment Award, Threshold Days Share-based Compensation Arrangement by Share-based Payment Award, Threshold Days Share-based Compensation Arrangement by Share-based Payment Award, Threshold Days Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Share-based Compensation Arrangement by Share-based Payment Award, Stock Options Exercise Period Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period Share-based Compensation Arrangement by Share-based Payment Award, Amount of Options Owned, Percent Share-based Compensation Arrangement by Share-based Payment Award, Amount of Options Owned, Percent Share-based Compensation Arrangement by Share-based Payment Award, Amount of Options Owned, Percent Additional shares of common stock reserved for issuance under the 2011 Plan (in shares) Aggregate intrinsic value of stock options exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value Total fair value of stock options vested Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value Total fair value of RSUs vested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Shares withheld for tax withholdings (in shares) Shares Paid for Tax Withholding for Share Based Compensation Total payments for the employees’ minimum tax obligations to taxing authorities Payments Related to Tax Withholding for Share-based Compensation PBRSUs granted (in shares) Stock-based compensation expense Allocated Share-based Compensation Expense Unrecognized compensation cost related to unvested equity awards Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Weighted-average service period of unrecognized compensation cost related to unvested equity awards Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Restricted stock units granted under equity award plans (in shares) Non-employee stock-based compensation expense Issuance of Stock and Warrants for Services or Claims Share-based Compensation Arrangement by Share-based Payment Award, Price per Share on Grant Date Multiplier Share-based Compensation Arrangement by Share-based Payment Award, Price on Grant Date Multiplier Share-based Compensation Arrangement by Share-based Payment Award, Price on Grant Date Multiplier Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Stock Repurchase Program, Authorized Amount Stock Repurchase Program, Authorized Amount Other Nonoperating Income (Expense) Interest Income (Expense), Net Interest Income (Expense), Net Income before provision for income taxes Net income Net income available to common stockholders: Net income available to common stockholders per common share(1): Other Data: Quarterly Financial Data [Abstract] Deferred revenue, including current portion Deferred Revenue Related Party Transactions Related Party Transactions Disclosure [Text Block] Consolidated Statements of Cash Flows [Abstract] Consolidated Statements of Cash Flows [Abstract] [Abstract] Cash flows from operating activities Cash flows from operating activities [Abstract] Adjustments to reconcile net income to net cash provided by operating activities: Adjustments to reconcile net income to net cash provided by operating activities: [Abstract] Depreciation and amortization Stock-based compensation Share-based Compensation Excess tax benefit from stock-based compensation Excess Tax Benefit from Share-based Compensation, Operating Activities (Gain) loss on sale of patent assets, net Amortization of premium on investments Accretion (Amortization) of Discounts and Premiums, Investments Deferred taxes Deferred Income Tax Expense (Benefit) Liabilities, Fair Value Adjustment Liabilities, Fair Value Adjustment Gains (Losses) on Extinguishment of Debt Gain (Loss) on Sale of Investments Other Other Noncash Income (Expense) Changes in assets and liabilities: Changes in assets and liabilities: [Abstract] Accounts receivable Increase (Decrease) in Accounts Receivable Other receivables Increase (Decrease) in Other Receivables Prepaid expenses and other assets Increase (Decrease) in Prepaid Expense and Other Assets Accounts payable Increase (Decrease) in Accounts Payable Accrued and other liabilities Increase (Decrease) in Accrued Liabilities and Other Operating Liabilities Deferred revenue Increase (Decrease) in Deferred Revenue Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Cash flows from investing activities Cash flows from investing activities [Abstract] Purchases of investments classified as available-for-sale Payments to Acquire Available-for-sale Securities Maturities of investments classified as available-for-sale Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities Sales of investments classified as available-for-sale Proceeds from Sale of Available-for-sale Securities Business acquisitions Payments to Acquire Businesses, Gross (Increase) decrease in restricted cash Increase (Decrease) in Restricted Cash Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment Acquisitions of patent assets Payments to Acquire Other Productive Assets Payment of Deposit for Acquisition of Intangible Asset Payment of Deposit for Acquisition of Intangible Asset Payment of Deposit for Acquisition of Intangible Asset Proceeds from sale of patent assets Proceeds from Sale of Intangible Assets Payments to Acquire Assets, Investing Activities Payments to Acquire Assets, Investing Activities Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Cash flows from financing activities Cash flows from financing activities [Abstract] Repayments of principal on deferred payment obligations Repayments of Other Debt Proceeds from other obligations Proceeds from (Payments for) Other Financing Activities Proceeds from exercise of stock options and other common stock issuances Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options Taxes paid related to net share settlements of restricted stock units Excess tax benefit from stock-based compensation Excess Tax Benefit from Share-based Compensation, Financing Activities Payments for Repurchase of Common Stock Net cash provided by financing activities Net Cash Provided by (Used in) Financing Activities Net increase (decrease) in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Supplemental disclosures of cash flow information Supplemental Cash Flow Information [Abstract] Cash paid for income taxes Income Taxes Paid Non-cash investing and financing activities Non-cash investing and financing activities [Abstract] Change in patent assets purchased and accrued but not paid Change in patent assets purchased and accrued but not paid. Change in fixed assets purchased and accrued but not yet paid Capital Expenditures Incurred but Not yet Paid Change in other assets purchased and accrued but not paid Change in other assets purchased and accrued but not paid Patent assets and intangible assets received in barter transactions Noncash or Part Noncash Acquisition, Intangible Assets Acquired Noncash or Part Noncash Acquisition, Net Nonmonetary Assets Acquired (Liabilities Assumed) Noncash or Part Noncash Acquisition, Net Nonmonetary Assets Acquired (Liabilities Assumed) Cost related to public offerings accrued but not paid CostRelatedToPublicOfferings Cost related to public offerings. Goodwill [Abstract] Goodwill [Abstract] Balance as of January 1, Goodwill from business acquisition Goodwill, Acquired During Period Balance as of December 31, Selected Quarterly Financial Information (Unaudited) Quarterly Financial Information [Text Block] Basic and Diluted Net Income Per Share Available To Common Stockholders [Abstract] -- None. No documentation exists for this element. -- Net income available to common stockholders: Net income available to common stockholders: [Abstract]0 Numerator: Numerator: [Abstract] Basic: Basic: [Abstract] Undistributed Earnings (Loss) Allocated to Participating Securities, Basic Undistributed Earnings (Loss) Allocated to Participating Securities, Basic Net income available to common stockholders – basic Diluted: Diluted: [Abstract] Net income available to common stockholders – diluted Denominator: Denominator: [Abstract] Basic shares: Basic shares: [Abstract] Weighted-average shares used in computing basic net income available to comon stockholders Diluted shares: Diluted shares: [Abstract] Dilutive effect of stock options and restricted stock units using treasury-stock method Weighted Average Number Diluted Shares Outstanding Adjustment Weighted-average shares used in computing diluted net income available to common stockholders Net income per common share available to common stockholders: Net income per share: [Abstract] Patent Assets [Abstract] -- None. No documentation exists for this element. -- Patent Assets, Net PatentAssetsTextBlock [Table Text Block] Patent assets. Accrued and Other Current Liabilities [Abstract] Fair Value Inputs, Liabilities, Quantitative Information [Table] Fair Value Inputs, Liabilities, Quantitative Information [Table] Accrued payroll-related expenses Accrued Payroll Related Expenses [Member] Accrued expenses Accrued Liabilities [Member] Fair Value Inputs, Liabilities, Quantitative Information [Line Items] Fair Value Inputs, Liabilities, Quantitative Information [Line Items] Property and Equipment, Net Property, Plant and Equipment Disclosure [Text Block] Patent Assets, Net ScheduleofPatentAssetsTableTextBlock [Table Text Block] -- None. No documentation exists for this element. -- Expected Future Annual Amortization Of Patent Assets Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Subsidiaries [Member] Subsidiaries [Member] Amortization of patent assets Escrow Deposits Related to Patent Assets Escrow Deposits Related to Patent Assets Escrow Deposits Related to Patent Assets Number of Companies Involved in Syndicate Number of Companies Involved in Syndicate Number of Companies Involved in Syndicate Finite-lived Intangible Assets Acquired Finite-lived Intangible Assets Acquired Income Before Income Tax Provision Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] Components Of The Provision For Income Taxes Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Net Deferred Tax Liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Reconciliation Of The Statutory Federal Income Tax To Effective Tax Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Unrecognized Tax Benefits Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] Subsequent Event [Table] Subsequent Event [Table] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] inventus Solutions Inc. [Member] inventus Solutions Inc. [Member] inventus Solutions Inc. [Member] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event [Member] Subsequent Event [Member] Subsequent Event [Line Items] Subsequent Event [Line Items] Business Acquisition, Percentage of Voting Interests Acquired Business Acquisition, Percentage of Voting Interests Acquired Business Combination, Consideration Transferred Business Combination, Consideration Transferred Document and Entity Information [Abstract] Entity Registrant Name Entity Registrant Name Document Type Document Type Document Fiscal Year Focus Document Fiscal Year Focus Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Amendment Flag Amendment Flag Entity Central Index Key Entity Central Index Key Entity Current Reporting Status Entity Current Reporting Status Entity Voluntary Filers Entity Voluntary Filers Entity Filer Category Entity Filer Category Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Document Fiscal Period Focus Document Fiscal Period Focus Entity Public Float Entity Public Float Employee Savings Plan Pension and Other Postretirement Benefits Disclosure [Text Block] Number of reportable segments Number of Reportable Segments Tax at statutory federal rate Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount State tax - net of federal benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Permanent differences Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount Foreign tax Effective Income Tax Rate Reconciliation, Tax Credit, Amount Foreign tax credits Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Amount Foreign income not taxed at federal rate Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount Other Effective Income Tax Rate Reconciliation, Other Adjustments, Amount