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Liabilities Accounts Payable and Accrued Liabilities Disclosure [Text Block] Foreign currency translation losses, net of taxes Foreign currency translation loss, net of taxes Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent Document Quarterly Report Document Quarterly Report Consideration transferred Asset Acquisition, Consideration Transferred Warrants Warrant [Member] Outstanding at the beginning of the period (in dollars per share) Outstanding at the end of the period (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Long-term debt Long-term Debt, Excluding Current Maturities Liabilities: Liabilities, Fair Value Disclosure [Abstract] Stock-based compensation expense Share-based Payment Arrangement, Expense Number of offices set for closure Lessee, Operating Lease, Number Of Leases Scheduled For Termination Lessee, Operating Lease, Number Of Leases Scheduled For Termination Convertible Notes Convertible Debt Securities [Member] Options exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Property and equipment under finance lease, accumulated depreciation Finance Lease, Right-of-Use Asset, Accumulated Amortization Weighted- Average Grant Date Fair Value per Share Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Assets to fund deferred compensation liability Defined Benefit Plan, Plan Assets, Amount Document Fiscal Period Focus Document Fiscal Period Focus Asset Acquisition [Line Items] Asset Acquisition [Line Items] Effective tax rate Effective Income Tax Rate Reconciliation, Percent Convertible Notes due 2025 Zero Point Seven Five Percent Convertible Notes Due Twenty Twenty Five [Member] Zero Point Seven Five Percent Convertible Notes Due Twenty Twenty Five Compensation and benefits Labor and Related Expense Net income (loss) Net income (loss) Net income (loss) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Weighted-Average Remaining Contractual Life Weighted-Average Remaining Contractual Life Amortization of issuance costs Amortization of Debt Issuance Costs Payables and Accruals [Abstract] Payables and Accruals [Abstract] Schedule of Income (Loss) before Income Tax Provision (Benefit) Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] CASH, CASH EQUIVALENTS AND RESTRICTED CASH, BEGINNING OF PERIOD CASH, CASH EQUIVALENTS AND RESTRICTED CASH, END OF PERIOD (See Note 2) Total cash, cash equivalents and restricted cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Product Information [Line Items] Product Information [Line Items] United States United States UNITED STATES Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Current assets: Assets, Current [Abstract] Other Proceeds from (Payments for) Other Financing Activities Gross Carrying Amount Finite-Lived Intangible Assets, Gross Entity Central Index Key Entity Central Index Key Schedule of Intangible Assets, Net Schedule of Finite-Lived Intangible Assets [Table Text Block] Amortization expense Capitalized Computer Software, Amortization Security Exchange Name Security Exchange Name Money market funds Cash and Cash Equivalents, Fair Value Disclosure Schedule of Accrued Expenses and Other Liabilities Schedule of Accounts Payable and Accrued Liabilities [Table Text Block] Exercise of stock options (in shares) Exercised (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Diluted (in shares) Diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Beginning balance Ending balance Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Schedule of Internally Developed Software, Net Summary of Internally Developed Software [Table Text Block] Summary of internally developed software. Recurring Basis Fair Value, Recurring [Member] Leasehold improvements funded by lease incentive Leasehold Improvements Funded by Lease Incentive Represents leasehold improvements funded by lease incentive. Income Taxes Income Tax Disclosure [Text Block] Weighted-average common shares outstanding: Weighted Average Number of Shares Outstanding, Basic [Abstract] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Current Fiscal Year End Date Current Fiscal Year End Date Schedule of Option Activity under the Company's Plans Share-based Payment Arrangement, Option, Activity [Table Text Block] Spread on variable rate basis (as a percent) Debt Instrument, Basis Spread on Variable Rate Measurement Basis [Axis] Measurement Basis [Axis] Schedule of Anti-Dilutive Securities Excluded from Computation of Diluted Earnings per Share Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Prepaid Expenses and Other Current Assets Other Current Assets [Text Block] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Investments in private companies Payments to Acquire Equity Method Investments Credit Facility [Axis] Credit Facility [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Schedule of Income (Loss) from Operations by Segment Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block] Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Building and building improvements Building and Building Improvements [Member] OPERATING ACTIVITIES: Net Cash Provided by (Used in) Operating Activities [Abstract] 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 Effective interest rate Debt Instrument, Interest Rate During Period Total current liabilities Liabilities, Current Taxes paid in lieu of shares issued for stock-based compensation Payment, Tax Withholding, Share-based Payment Arrangement Credit facility amount Line of Credit Facility, Maximum Borrowing Capacity Money Market Funds Money Market Funds [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Title of 12(b) Security Title of 12(b) Security Total long-lived assets, net Long-Lived Assets Statement [Table] Statement [Table] Customer lists Customer Lists [Member] Schedule of Interest Expense Interest Expense, Debt [Table Text Block] Tabular disclosure of interest expense related to debt. Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Other non-current assets Increase (Decrease) in Other Noncurrent Assets Statistical Measurement [Axis] Statistical Measurement [Axis] Subsequent Event Subsequent Event [Member] Cover [Abstract] Cover [Abstract] Exercise prices of stock options outstanding (in dollars per share) Share Based Compensation Outstanding Options Exercise Price The exercise price per outstanding option, as of the balance sheet date. Goodwill Goodwill Intangible assets, net Finite-Lived Intangible Assets, Net Convertible Notes due 2023 One Point Seven Five Percent Convertible Notes Due Twenty Twenty Three [Member] One Point Seven Five Percent Convertible Notes Due Twenty Twenty Three Non-controlling interest Stockholders' Equity Attributable to Noncontrolling Interest Fair Value of Assets to Fund Deferred Compensation Liability Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Income tax payables Accrued Income Taxes, Current Prepaid technology Prepaid Technology Amount of asset related to consideration paid in advance for technology that provides economic benefits within a future period of one year or the normal operating cycle, if longer. Write off of deferred debt issuance costs Write off of Deferred Debt Issuance Cost Other expense, net Other expense, net Other Nonoperating Expense Organization and Description of Business Nature of Operations [Text Block] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subscription-based Subscription-based Subscription and Circulation [Member] Gross property and equipment under finance lease Finance Lease, Right-of-Use Asset, before Accumulated Amortization Contributions Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Number of shares to be vest upon each evaluation date, percentage Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares to be Vest Upon Each Evaluation Date, Percentage Number of equity based instruments to be vested upon each evaluation date in percentage. Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Debt Long-term Debt [Text Block] Adjustments to reconcile net income (loss) to net cash provided by operating activities: Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]