Entity Central Index Key Document and entity information. Document And Entity Information [Abstract] Document And Entity Information [Abstract] Entities [Table] Entities [Table] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Class of Stock Statement Class Of Stock [Axis] Class of Stock Class Of Stock [Domain] Common Stock Common Stock [Member] Class B Common Stock Common Class B [Member] Document Information [Line Items] Document Information [Line Items] Document Type Document Type Amendment Flag Amendment Flag Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Entity Registrant Name Entity Registrant Name Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock Shares Outstanding Income Statement [Abstract] Income Statement [Abstract] Statement [Table] Statement [Table] Income Statement Location Income Statement Location [Axis] Income Statement Location Income Statement Location [Domain] Web Site Development Cost Amortization Member Website development costs Web Site Development Cost Amortization [Member] Selling and Marketing Selling And Marketing Expense [Member] Technology and content. Technology and Content Technology And Content [Member] General and Administrative General And Administrative Expense [Member] Statement [Line Items] Statement [Line Items] Revenue Revenues Costs and expenses: Costs And Expenses [Abstract] Cost of revenue Cost Of Services Excluding Depreciation Depletion And Amortization Selling and marketing Selling And Marketing Expense Technology and content Information Technology And Data Processing General and administrative General And Administrative Expense Depreciation Depreciation Amortization of intangible assets Amortization Of Intangible Assets Total costs and expenses: Costs And Expenses Operating income Operating Income Loss Other income (expense): Nonoperating Income Expense [Abstract] Interest expense Interest Expense Interest income and other, net Other Nonoperating Income Expense Total other expense, net Nonoperating Income Expense Income before income taxes Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments Provision for income taxes Income Tax Expense Benefit Net income Net Income Loss Earnings per share attributable to common stockholders (Note 14): Earnings Per Share [Abstract] Basic Earnings Per Share Basic Diluted Earnings Per Share Diluted Weighted average common shares outstanding (Note 14): Weighted Average Number Of Shares Outstanding [Abstract] Basic Weighted Average Number Of Shares Outstanding Basic Diluted Weighted Average Number Of Diluted Shares Outstanding Stock-based compensation: Share Based Compensation [Abstract] Stock-based compensation Allocated Share Based Compensation Expense Statement Of Income And Comprehensive Income [Abstract] Statement Of Income And Comprehensive Income [Abstract] Net income Other comprehensive income (loss), net of tax : Other Comprehensive Income Loss Before Tax Period Increase Decrease [Abstract] Foreign currency translation adjustments Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax Available-for-sale investments: Other Comprehensive Income Available For Sale Securities Adjustment Net Of Tax Period Increase Decrease [Abstract] Change in net unrealized loss Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax Total other comprehensive loss, net of tax Other Comprehensive Income Loss Net Of Tax Comprehensive income Comprehensive Income Net Of Tax Statement Of Financial Position [Abstract] Statement Of Financial Position [Abstract] ASSETS Assets [Abstract] Current assets: Assets Current [Abstract] Cash and cash equivalents Cash And Cash Equivalents At Carrying Value Short-term marketable securities (Note 5) Marketable Securities Current Accounts receivable, net of allowance for doubtful accounts of $4 and $3 at June 30, 2014 and December 31, 2013, respectively Accounts Receivable Net Current Prepaid expenses and other current assets Prepaid Expense And Other Assets Current Total current assets Assets Current Long-term assets: Assets Noncurrent [Abstract] Long-term marketable securities (Note 5) Marketable Securities Noncurrent Property and equipment, net (Note 6) Property Plant And Equipment Net Other long-term assets Other Assets Noncurrent Intangible assets, net (Note 7) Intangible Assets Net Excluding Goodwill Goodwill (Note 7) Goodwill TOTAL ASSETS Assets LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities And Stockholders Equity [Abstract] Current liabilities: Liabilities Current [Abstract] Accounts payable Accounts Payable Current Deferred merchant payables Customer Advances Current Deferred revenue Deferred Revenue Current Credit facility borrowings (Note 8) Line Of Credit Facility Amount Outstanding Borrowings, current (Note 8) Short Term Borrowings Taxes payable Accrued Income Taxes Current Accrued expenses and other current liabilities Accrued Liabilities Current Total current liabilities Liabilities Current Deferred income taxes, net Deferred Tax Liabilities Noncurrent Other long-term liabilities (Note 10) Other Liabilities Noncurrent Borrowings, net of current portion (Note 8) Long Term Debt Noncurrent Total Liabilities Liabilities Commitments and contingencies (Note 11) Commitments And Contingencies Stockholders’ equity: (Note 12) Stockholders Equity [Abstract] Preferred stock, $0.001 par value Authorized shares: 100,000,000 Shares issued and outstanding: 0 and 0 Preferred Stock Value Common stock Common Stock Value Additional paid-in capital Additional Paid In Capital Common Stock Retained earnings Retained Earnings Accumulated Deficit Treasury stock-common stock, at cost, 2,120,709 and 2,120,709 shares Treasury Stock Value Total Stockholders’ Equity Stockholders Equity TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities And Stockholders Equity Allowance for doubtful accounts Allowance For Doubtful Accounts Receivable Current Preferred stock, par value Preferred Stock Par Or Stated Value Per Share Preferred stock, shares authorized Preferred Stock Shares Authorized Preferred stock, shares issued Preferred Stock Shares Issued Preferred stock, shares outstanding Preferred Stock Shares Outstanding 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 Common stock, shares outstanding Common Stock Shares Outstanding Treasury stock, shares Treasury Stock Shares Net increase in additional paid in capital to reflect proceeds received related to the issuance of common stock as a result of the exercise of stock options and vesting of restricted stock units. Statement Of Stockholders Equity [Abstract] Statement Of Stockholders Equity [Abstract] Equity Components Statement Equity Components [Axis] Equity Component Equity Component [Domain] Additional Paid-in Capital Additional Paid In Capital [Member] Retained Earnings Retained Earnings [Member] Treasury Stock Treasury Stock [Member] Beginning balance Beginning balance, shares Issuance of common stock related to exercises of options and vesting of RSUs Adjustments To Additional Paid In Capital Issuance Of Common Stock Related To Exercise Of Options And Vesting Of Restricted Stock Units Value Issuance of common stock related to exercise of options and vesting of RSUs, shares Stock Issued During Period Shares Share Based Compensation Gross Tax benefits on equity awards Adjustment To Additional Paid In Capital Income Tax Effect From Share Based Compensation Net Minimum withholding taxes on net share settlements of equity awards Adjustments Related To Tax Withholding For Share Based Compensation Stock based compensation Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value Ending balance Ending balance, shares Statement Of Cash Flows [Abstract] Statement Of Cash Flows [Abstract] Operating activities: Net Cash Provided By Used In Operating Activities Continuing Operations [Abstract] Adjustments to reconcile net income to net cash provided by operating activities: Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities [Abstract] Depreciation of property and equipment, including amortization of internal-use software and website development Stock-based compensation Share Based Compensation Amortization of discounts and premiums on marketable securities, net Accretion Amortization Of Discounts And Premiums Investments Deferred tax benefit Deferred Income Tax Expense Benefit Excess tax benefits from stock-based compensation Excess Tax Benefit From Share Based Compensation Operating Activities Other, net Other Noncash Income Expense Changes in operating assets and liabilities, net of effects from acquisitions: Increase Decrease In Operating Capital [Abstract] Accounts receivable, prepaid expenses and other assets Increase Decrease In Prepaid Deferred Expense And Other Assets Accounts payable, accrued expenses and other liabilities Increase Decrease In Accrued Liabilities And Other Operating Liabilities Deferred merchant payables Increase Decrease In Customer Advances Income taxes, net Increase Decrease In Accrued Taxes Payable Deferred revenue Increase Decrease In Deferred Revenue Net cash provided by operating activities Net Cash Provided By Used In Operating Activities Continuing Operations Investing activities: Net Cash Provided By Used In Investing Activities Continuing Operations [Abstract] Acquisitions, net of cash acquired Payments To Acquire Businesses Net Of Cash Acquired Capital expenditures, including internal-use software and website development Payments To Acquire Property Plant And Equipment Purchases of marketable securities Payments To Acquire Marketable Securities Sales of marketable securities Proceeds From Sale And Maturity Of Marketable Securities Maturities of marketable securities Proceeds From Sale And Maturity Of Available For Sale Securities Net cash used in investing activities Net Cash Provided By Used In Investing Activities Continuing Operations Financing activities: Net Cash Provided By Used In Financing Activities Continuing Operations [Abstract] Repurchase of common stock Payments For Repurchase Of Equity Proceeds from credit facilities Proceeds From Lines Of Credit Payments to credit facilities Repayments Of Lines Of Credit Principal payments on long-term debt Repayments Of Long Term Debt Proceeds from exercise of stock options Proceeds From Stock Options Exercised Payment of minimum withholding taxes on net share settlements of equity awards Payments Related To Tax Withholding For Share Based Compensation Excess tax benefits from stock-based compensation Excess Tax Benefit From Share Based Compensation Financing Activities Payments on construction in-process related to build to suit lease obligation Payments For Construction In Process Net cash used in financing activities Net Cash Provided By Used In Financing Activities Continuing Operations Effect of exchange rate changes on cash and cash equivalents Effect Of Exchange Rate On Cash And Cash Equivalents 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 disclosure of non-cash investing and financing activities: Cash Flow Noncash Investing And Financing Activities Disclosure [Abstract] Capitalization of construction in-process related to build to suit lease obligation Construction In Progress Expenditures Incurred But Not Yet Paid Text Block [Abstract] Organization, Business Description and Basis of Presentation Organization Consolidation Basis Of Presentation Business Description And Accounting Policies [Text Block] Significant Accounting Policies Significant Accounting Policies [Text Block] Acquisitions Business Combination Disclosure [Text Block] Stock Based Awards and Other Equity Instruments Disclosure Of Compensation Related Costs Share Based Payments [Text Block] Financial Instruments Financial Instruments Disclosure [Text Block] Property and Equipment, Net Property Plant And Equipment Disclosure [Text Block] Goodwill and Intangible Assets, Net Goodwill And Intangible Assets Disclosure [Text Block] Debt Debt Disclosure [Text Block] Income Taxes Income Tax Disclosure [Text Block] Other Long-Term Liabilities Other Liabilities Disclosure [Text Block] Commitments and Contingencies Commitments And Contingencies Disclosure [Text Block] Stockholders' Equity Stockholders Equity Note Disclosure [Text Block] Segment Information Segment Reporting Disclosure [Text Block] Earnings Per Share Earnings Per Share [Text Block] Related Party Transactions Related Party Transactions Disclosure [Text Block] Subsequent Events Subsequent Events [Text Block] Basis of Presentation Basis Of Accounting Policy Policy [Text Block] Principles of Consolidation Consolidation Policy [Text Block] Reclassifications Prior Period Reclassification Adjustment Description Accounting Estimates Use Of Estimates Seasonality policy. Seasonality Seasonality Policy [Text Block] New accounting pronouncements not yet adopted. New Accounting Pronouncements Not Yet Adopted New Accounting Pronouncements Not Yet Adopted Policy [Text Block] Recently Adopted Accounting Pronouncements New Accounting Pronouncements Policy Policy [Text Block] Summary of Purchase Price Allocation Initially Recorded on Consolidated Balance Sheet for All Acquisitions Schedule Of Recognized Identified Assets Acquired And Liabilities Assumed Table [Text Block] Amount of Stock-Based Compensation Expense Related to Stock-Based Awards, Primarily Stock Options and RSUs Schedule Of Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Text Block] Summary of Status and Activity for Stock Option Awards Relating to Common Stock Schedule Of Share Based Compensation Stock Options Activity Table [Text Block] Weighted-Average Assumptions of Estimated Fair Value of Stock Option Grants Schedule Of Share Based Payment Award Stock Options Valuation Assumptions Table [Text Block] Summary of RSU Activity on Common Stock Schedule Of Share Based Compensation Restricted Stock Units Award Activity Table [Text Block] Summary of Unrecognized Stock-Based Compensation Expense, Net of Estimated Forfeitures and Weighted Average Period Remaining Schedule Of Unrecognized Compensation Cost Nonvested Awards Table [Text Block] Schedule of Cash, Cash Equivalents and Marketable Securities Available For Sale Securities [Text Block] Fair Value and Notional Principal Amounts of Outstanding or Unsettled Derivative Instruments Schedule Of Derivative Instruments In Statement Of Financial Position Fair Value [Text Block] Property and Equipment, Net Property Plant And Equipment [Text Block] Summary of Changes in Goodwill Schedule Of Goodwill [Text Block] Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination Finite Lived And Indefinite Lived Intangible Assets Acquired As Part Of Business Combination Table [Text Block] Components of Intangible Assets with Definite Lives Schedule Of Finite Lived Intangible Assets Table [Text Block] Summary of Estimated Future Amortization Expense Related to Intangible Assets with Definite Lives Scheduleof Finite Lived Intangible Assets Future Amortization Expense Table [Text Block] Summary of Total Outstanding Borrowings Schedule Of Debt Table [Text Block] Schedule of Other Long-Term Liabilities Other Noncurrent Liabilities Table [Text Block] Reconciliation of Adjusted EBITDA to Net Income Reconciliation Of Operating Profit Loss From Segments To Consolidated [Text Block]