Entity Central Index Key Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Tangible Assets Liabilities Net Deferred tax asset recorded related to Corporate HQ building, which is identified as a financing obligation. Deferred tax assets foreign advertising spend. Deferred expense related to cost sharing arrangements. Deferred tax liability recorded related to Corporate HQ building, which is identified as a financing obligation. Deferred income related to cost sharing arrangements. Expected tax benefits related to change in cost-sharing treatment of stock based compensation. Net income (loss) plus: (1) provision for income taxes; (2) other income (expense), net; (3) depreciation of property and equipment, including amortization of internal use software and website development; (4) amortization of intangible assets; (5) stock-based compensation and other stock-settled obligations; (6) goodwill, long-lived asset and intangible asset impairments; and (7) non-recurring expenses. 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 Well-known Seasoned Issuer Entity Well Known Seasoned Issuer Entity Current Reporting Status Entity Current Reporting Status Entity Voluntary Filers Entity Voluntary Filers Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock Shares Outstanding Entity Public Float Entity Public Float 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 (Note 17) 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 (Note 18) Other Nonoperating Income Expense Total other income (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 5): Earnings Per Share [Abstract] Basic Earnings Per Share Basic Diluted Earnings Per Share Diluted Weighted average common shares outstanding (Note 5): 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] Property, Plant and Equipment, Type Property Plant And Equipment By Type [Axis] Property, Plant and Equipment, Type Property Plant And Equipment Type [Domain] Website Development Costs Software And Software Development Costs [Member] Finite-Lived Intangible Assets by Major Class Finite Lived Intangible Assets By Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name Finite Lived Intangible Assets Major Class Name [Domain] Acquired Technology Technology Based Intangible Assets [Member] Income Statement Location Income Statement Location [Axis] Income Statement Location Income Statement Location [Domain] 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 Net Of Tax Period Increase Decrease [Abstract] Foreign currency translation adjustments Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Before Tax Reclassification adjustment on sale of business included in total other income (expense), net (Note 3) Other Comprehensive Income Loss Foreign Currency Transaction And Translation Reclassification Adjustment From A O C I Realized Upon Sale Or Liquidation Net Of Tax Total other comprehensive loss Other Comprehensive Income Loss Net Of 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 6) Cash And Cash Equivalents At Carrying Value Short-term marketable securities (Note 6) Marketable Securities Current Accounts receivable, net of allowance for doubtful accounts of $9 and $6, respectively (Note 2) 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 6) Marketable Securities Noncurrent Property and equipment, net (Note 7) Property Plant And Equipment Net Intangible assets, net (Note 8) Intangible Assets Net Excluding Goodwill Goodwill (Note 8) Goodwill Deferred income taxes, net (Note 10) Deferred Income Tax Assets Net Other long-term assets Other Assets Noncurrent 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 (Note 2) Customer Advances Current Deferred revenue Deferred Revenue Current Current portion of debt (Note 9) Short Term Borrowings Taxes payable (Note 10) Accrued Income Taxes Current Accrued expenses and other current liabilities (Note 11) Accrued Liabilities Current Total current liabilities Liabilities Current Long-term debt (Note 9) Long Term Debt Noncurrent Deferred income taxes, net (Note 10) Deferred Tax Liabilities Noncurrent Other long-term liabilities (Note 12) Other Liabilities Noncurrent Total Liabilities Liabilities Commitments and contingencies (Note 13) Commitments And Contingencies Stockholders’ equity: (Note 15) 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 loss Accumulated Other Comprehensive Income Loss Net Of Tax Treasury stock-common stock, at cost, 3,395,487 and 1,393,131 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 The amount of acquisition cost of a business combination allocated to assumed equity from the acquired entity. 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 Loss Accumulated Other Comprehensive Income [Member] Treasury Stock Treasury Stock [Member] Beginning balance Beginning balance, shares Cumulative effect adjustment from adoption of ASU 2016-09 (Note 2) Cumulative Effect On Retained Earnings Net Of Tax1 Other comprehensive loss Issuance of common stock related to exercise 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 Issuance of treasury stock as charitable contribution (Note 16) Stock Issued During Period Value Treasury Stock Reissued Issuance of treasury stock as charitable contribution, Shares (Note 16) Stock Issued During Period Shares Treasury Stock Reissued Tax benefits on equity awards, net Adjustment To Additional Paid In Capital Income Tax Effect From Share Based Compensation Net Repurchase of common stock Treasury Stock Value Acquired Cost Method Repurchase of common stock, shares Treasury Stock Shares Acquired Withholding taxes on net share settlements of equity awards Adjustments Related To Tax Withholding For Share Based Compensation Fair value of stock options assumed in connection with acquisition (Note 3) Business Acquisition Purchase Price Allocation Assumed Equity Stock-based compensation Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value Other Stockholders Equity Other Other, shares Stockholders Equity Other Shares Ending balance Ending balance, shares Payments to acquire businesses and other investments net of cash acquired. Statement Of Cash Flows [Abstract] Credit Facility Credit Facility [Axis] Credit Facility Credit Facility [Domain] Chinese credit facility. Chinese Credit Facilities Chinese Credit Facility [Member] 2011 Credit facility. 2011 Credit Facility Two Thousand And Eleven Credit Facility [Member] Twenty fifteen credit facility. 2015 Credit Facility Twenty Fifteen Credit Facility [Member] 2016 Credit facility. 2016 Credit Facility Two Thousands And Sixteen Credit Facility [Member] 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 (Note 4) Share Based Compensation Non-cash contribution to charitable foundation (Note 17) Noncash Contribution Expense Gain on sale of business (Note 3) Gain Loss On Sale Of Business Deferred tax benefit Deferred Income Tax Expense Benefit Other, net Other Noncash Income Expense Changes in operating assets and liabilities, net of effects from acquisitions and other investments, and dispositions: 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 tax receivables/payables, net Increase Decrease In Income Taxes Payable Net Of Income Taxes Receivable 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] Capital expenditures, including internal-use software and website development Payments To Acquire Property Plant And Equipment Acquisitions and other investments, net of cash acquired (Note 3) Payments To Acquire Businesses And Other Investments Net Of Cash Acquired Proceeds from sale of business, net of cash sold (Note 3) Proceeds From Divestiture Of Businesses Net Of Cash Divested 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 Other investing activities, net Payments For Proceeds From Other Investing Activities 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 (Note 15) Payments For Repurchase Of Common Stock Proceeds from credit facilities Proceeds From Lines Of Credit Payments to credit facilities Repayments Of Lines Of Credit Principal payments on credit facilities Repayments Of Long Term Debt Proceeds from credit facility, net of financing costs Proceeds From Debt Net Of Issuance Costs Proceeds from exercise of stock options Proceeds From Issuance Or Sale Of Equity Payment of withholding taxes on net share settlements of equity awards Payments Related To Tax Withholding For Share Based Compensation Other financing activities, 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 (decrease) increase 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 cash flow information: Supplemental Cash Flow Information [Abstract] Cash paid during the period for income taxes, net of refunds Income Taxes Paid Net Cash paid during the period for interest Interest Paid Supplemental disclosure of non-cash investing and financing activities: Cash Flow Noncash Investing And Financing Activities Disclosure [Abstract] Stock-based compensation capitalized with internal-use software and website development costs Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount Capitalization of construction in-process related to build to suit lease Construction In Progress Expenditures Incurred But Not Yet Paid Capital expenditures incurred but not yet paid related to build to suit lease Capital Expenditures Incurred But Not Yet Paid Accounting Policies [Abstract]