Entity Central Index Key Document and entity information. Document And Entity Information [Abstract] Document And Entity Information Document and entity information Document And Entity Information [Table] Document And Entity Information [Table] Class of Stock Statement Class Of Stock [Axis] Class of Stock Class Of Stock [Domain] Common stock, unclassified. Common Stock, Unclassified Common Stock Unclassified [Member] Class B Common Stock Common Class B [Member] Document And Entity Information [Line Items] Document And Entity 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 Trading Symbol Trading Symbol 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] 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 Extraordinary Items Noncontrolling Interest Provision for income taxes Income Tax Expense Benefit Net income Net Income Loss Earnings per share attributable to common stockholders (Note 13): Earnings Per Share [Abstract] Basic Earnings Per Share Basic Diluted Earnings Per Share Diluted Weighted average common shares outstanding (Note 13): Weighted Average Number Of Shares Outstanding [Abstract] Basic Weighted Average Number Of Shares Outstanding Basic Diluted Weighted Average Number Of Diluted Shares Outstanding Statement [Table] Statement [Table] Income Statement Location Income Statement Location [Axis] Income Statement Location Income Statement Location [Domain] Acquired technology amortization. Acquired technology Acquired Technology Amortization [Member] Web site development cost amortization. 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] Amortization adjustment Adjustment For Amortization Stock-based compensation: Share Based Compensation [Abstract] Stock-based compensation Allocated Share Based Compensation Expense Statement Of Income And Comprehensive Income [Abstract] Net income Other comprehensive income (loss): Other Comprehensive Income Loss Before Tax Period Increase Decrease [Abstract] Foreign currency translation adjustments Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Before Tax Total other comprehensive income (loss) Other Comprehensive Income Loss Before Tax Comprehensive income Comprehensive Income Net Of Tax Statement Of Financial Position [Abstract] ASSETS Assets [Abstract] Current assets: Assets Current [Abstract] Cash and cash equivalents (Note 4) Cash And Cash Equivalents At Carrying Value Short-term marketable securities (Note 4) Available For Sale Securities Current Accounts receivable, net of allowance for doubtful accounts of $7 and $7 at March 31, 2015 and December 31, 2014, respectively Accounts Receivable Net Current Prepaid expenses and other current assets Prepaid Expense And Other Assets Current Total current assets Assets Current Long-term marketable securities (Note 4) Available For Sale Securities Noncurrent Property and equipment, net (Note 5) Property Plant And Equipment Net Other long-term assets Other Assets Noncurrent Intangible assets, net (Note 6) Intangible Assets Net Excluding Goodwill Goodwill (Note 6) 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 7) Line Of Credit Borrowings, current (Note 7) Short Term Borrowings Taxes payable Accrued Income Taxes Current Accrued expenses and other current liabilities (Note 9) 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 7) Long Term Debt Noncurrent Total Liabilities Liabilities Commitments and contingencies (Note 11) Commitments And Contingencies Stockholders’ equity: 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 Accumulated other comprehensive income (loss) Accumulated Other Comprehensive Income Loss Net Of Tax Treasury stock-common stock, at cost, 2,194,173 and 2,194,173 shares, March 31, 2015 and December 31, 2014, respectively 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 Statement Of Stockholders Equity [Abstract] Equity Components Statement Equity Components [Axis] Equity Component Equity Component [Domain] Common Stock Common Stock [Member] Additional Paid-in Capital Additional Paid In Capital [Member] Retained Earnings Retained Earnings [Member] Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income [Member] Treasury Stock Treasury Stock [Member] Beginning balance Beginning balance, shares Shares Outstanding Issuance of common stock related to exercises of options and vesting of RSUs Stock Issued During Period Value Stock Options Exercised Issuance of common stock related to exercise of options and vesting of RSUs, shares Stock Issued During Period Shares Stock Options Exercised Tax benefits on equity awards, net 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] 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 expense Share Based Compensation Deferred tax expense 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 Of Available For Sale Securities Maturities of marketable securities Proceeds From Maturities Prepayments And Calls 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] 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 Issuance Or Sale Of Equity 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 Other, net Proceeds From Payments For Other Financing Activities 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 Capital expenditures incurred but not yet paid primarily related to build to suit lease Capital Expenditures Incurred But Not Yet Paid Accounting Policies [Abstract] 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] Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] Stock Based Awards and Other Equity Instruments Disclosure Of Compensation Related Costs Share Based Payments [Text Block] Investments All Other Investments [Abstract] Financial Instruments Financial Instruments Disclosure [Text Block] Property Plant And Equipment [Abstract] Property and Equipment, Net Property Plant And Equipment Disclosure [Text Block] Goodwill And Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets, Net Goodwill And Intangible Assets Disclosure [Text Block] Debt Disclosure [Abstract] Debt Debt Disclosure [Text Block] Income Tax Disclosure [Abstract] Income Taxes Income Tax Disclosure [Text Block] Accrued expenses and other current liabilities. Payables And Accruals [Abstract] Accrued Expenses and Other Current Liabilities Accrued Expenses And Other Current Liabilities Disclosure [Text Block] Other Liabilities Noncurrent [Abstract] Other Long-Term Liabilities Other Liabilities Disclosure [Text Block] Commitments And Contingencies Disclosure [Abstract] Commitments and Contingencies Commitments And Contingencies Disclosure [Text Block] Segment Reporting [Abstract] Segment Information Segment Reporting Disclosure [Text Block] Earnings Per Share Earnings Per Share [Text Block] Related Party Transactions [Abstract] Related Party Transactions Related Party Transactions Disclosure [Text Block] Subsequent Events [Abstract] Subsequent Events Subsequent Events [Text Block] Basis of Presentation Basis Of Accounting Policy Policy [Text Block] Reclassifications Prior Period Reclassification Adjustment Description Accounting Estimates Use Of Estimates Description of seasonality of business. 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] Amount of Stock-Based Compensation Expense Related to Stock-Based Awards, Primarily Stock Options and Restricted Stock Units (RSUs) Schedule Of Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Text Block] Summary of Stock Option 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 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]