Disclosure of Compensation Related Costs, Share-based Payments [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] Restricted Stock Units and Performance Share Units [Member] Awards Other Than Options [Member] Discloses pertinent information related to awards other than stock options awarded as part of an equity-based compensation plan. Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Awards - Shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Unvested at December 31, 2013 Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Performance Share Units Adjustment (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Performance Shares Adjustment Adjustment for performance share units based on estimated probable shares to be issued at the end of the performance period. Forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Unvested at June 30, 2014 Share-Based Awards - Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract] Unvested at December 31, 2013 Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value 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 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 Performance Share Units Adjustment (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award Equity Instruments Other than Options Other Adjustments Weighted Average Grant Date Fair Value The weighted average fair value of adjustments for probable shares to be issued related to performance share units granted for equity-based award plans other than stock (unit) option plans. 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 Unvested at June 30, 2014 Goodwill and Intangible Assets Disclosure [Abstract] Schedule of Finite-Lived Intangible Assets by Major Class [Table] Schedule of Finite-Lived Intangible Assets [Table] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum [Member] Minimum [Member] Maximum [Member] Maximum [Member] 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] Supply and distribution agreements [Member] Distribution Rights [Member] Technology [Member] Patented Technology [Member] Patents [Member] Patents [Member] Internet domain names [Member] Internet Domain Names [Member] Trade names [Member] Trade Names [Member] Other [Member] Other Intangible Assets [Member] Finite-lived intangible assets Finite-Lived Intangible Assets [Line Items] Gross Carrying Amount Finite-Lived Intangible Assets, Gross Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Net Carrying Amount Intangible Assets, Net (Excluding Goodwill) Amortization period (in years) Finite-Lived Intangible Asset, Useful Life Finite lived intangibles, weighted average useful life Acquired Finite-lived Intangible Assets, Weighted Average Useful Life Amortization Amortization of Intangible Assets Annual estimated amortization expense for intangible assets Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] 2014 Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year 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 2018 Finite-Lived Intangible Assets, Amortization Expense, Year Four 2019 Finite-Lived Intangible Assets, Amortization Expense, Year Five Thereafter Finite-Lived Intangible Assets, Amortization Expense, after Year Five Total Finite-Lived Intangible Assets, Net Goodwill: Goodwill [Roll Forward] Balance at December 31, 2013 Goodwill Acquisitions Goodwill, Acquired During Period Currency translation adjustments Goodwill, Translation Adjustments Balance at June 30, 2014 Business Combinations [Abstract] Business Combination Disclosure [Text Block] Business Combination Disclosure [Text Block] Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Statement [Table] Statement [Table] Statement, Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Statement Statement [Line Items] Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Other comprehensive income, net of tax Other Comprehensive Income (Loss), Net of Tax [Abstract] Foreign currency translation adjustments (1) Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax Unrealized gain (loss) on marketable securities (2) Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax Comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Less: Comprehensive income (loss) attributable to noncontrolling interests (See Note 11) Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Comprehensive income attributable to common stockholders Comprehensive Income (Loss), Net of Tax, Attributable to Parent Commitments and Contingencies Disclosure [Abstract] Loss Contingencies [Table] Loss Contingencies [Table] Litigation Related to Travel Transaction Taxes By Geographic Area [Axis] Litigation Related to Travel Transaction Taxes By Geographic Area [Axis] Litigation Related to Travel Transaction Taxes By Geographic Area [Axis] Litigation Related to Travel Transaction Taxes By Geographic Area [Domain] Litigation Related to Travel Transaction Taxes By Geographic Area [Domain] Litigation Related to Travel Transaction Taxes By Geographic Area [Domain] State of California [Member] CALIFORNIA City and County of San Francisco [Member] City of San Francisco [Member] Represents City of San Francisco. Hawaii [Member] HAWAII District of Columbia [Member] DISTRICT OF COLUMBIA Loss Contingencies by Nature of Contingency [Axis] Loss Contingency Nature [Axis] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Litigation related to travel transaction taxes [Member] Litigation Related to Travel Transaction Taxes [Member] Litigation Related to Travel Transaction Taxes [Member] Litigation related to alleged anti-trust violations [Member] Litigation Related to Alleged Anti-trust Violations [Member] Litigation Related to Alleged Anti-trust Violations [Member] Travel Transaction Taxes Loss Contingencies [Line Items] Approximate number of lawsuits brought by or against states, cities and counties over issues involving the payment of travel transaction taxes (in cases) Loss Contingency Number of Lawsuits This element represents the number of lawsuits in which the reporting entity was involved. Minimum number of municipalities and counties which have initiated audit proceedings (in governmental units) Loss Contingency Audit Proceedings Number Of Municipalities And Counties This element represents the number of municipalities or counties which have initiated audit proceedings. Minimum number of states which have initiated audit proceedings (in governmental units) Loss Contingency Audit Proceedings Number Of States This element represents the number of states which have initiated audit proceedings. Assessed taxes including interest and penalties (in dollars) Loss Contingency, Tax, Interest, and Penalties Assessed Represents the tax assessment issued by the tax authority including interest and penalties. Payments of tax and interest for loss contingency related to travel transaction taxes (in dollars) Payments Of Tax And Interest For Loss Contingency Related To Hotel Occupancy And Other Taxes PaymentsOfTaxAndInterestForLossContingencyRelatedToHotelOccupancyAndOtherTaxes Accrual for the potential resolution of issues related to travel transaction taxes (in dollars) Loss Contingency Accrual Loss contingency complaint filed alleging antitrust violations Loss Contingency Complaint Filed Alleging Antitrust Violations Loss Contingency Complaint Filed Alleging Antitrust Violations Loss contingency other complaints alleging antitrust violations Loss Continency Other Complaints Alleging Antitrust Violations LossContinencyOtherComplaintsAllegingAntitrustViolations Statement of Comprehensive Income [Abstract] Tax (benefit) associated with Net Investment Hedges OtherComprehensiveIncomeForeignCurrencyTranslationForNetInvestmentHedgeArisingDuringPeriodTax OtherComprehensiveIncomeForeignCurrencyTranslationForNetInvestmentHedgeArisingDuringPeriodTax Tax (benefit) associated with marketable securities Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax Earnings Per Share [Abstract] 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 Excluded from Computation of Earnings Per Share, by Antidilutive Securities [Axis] Antidilutive Securities [Axis] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Unvested Stock Awards Outstanding and Convertible Debt Securities [Member] Unvested Stock Awards Outstanding and Convertible Debt Securities [Member] Unvested Stock Awards Outstanding and Convertible Debt Securities [Member] Convertible Debt [Member] Convertible Debt Securities [Member] Anti-dilutive Securities Excluded From Computation Of Earnings Per Share Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Weighted average number of basic common shares outstanding Weighted Average Number of Shares Outstanding, Basic Weighted average dilutive stock options, restricted stock units and performance share units Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Assumed conversion of convertible debt (in shares) Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities Weighted average number of diluted common and common equivalent shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Diluted Anti-dilutive potential common shares Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Fair Value Disclosures [Abstract] Derivative [Table] Derivative [Table] Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Recurring Basis [Member] Fair Value, Measurements, Recurring [Member] Derivative Instrument Risk [Axis] Derivative Instrument [Axis] Derivative Contract Type [Domain] Derivative Contract [Domain] Foreign Exchange Contracts, Translation Risk [Member] Foreign Exchange Contracts, Translation Risk [Member] Foreign Exchange Contracts, Translation Risk [Member] Foreign Exchange Contracts, Transaction Risk [Member] Foreign Exchange Contracts, Transaction Risk [Member] Foreign Exchange Contracts, Transaction Risk [Member] Derivative By Nature [Axis] Derivative, by Nature [Axis] Derivative, Name [Domain] Derivative, Name [Domain] Foreign Currency Contracts [Member] Forward Contracts [Member] Hedging Relationship [Axis] Hedging Relationship [Axis] Hedging Relationship [Domain] Hedging Relationship [Domain] Net Investment Hedging [Member] Net Investment Hedging [Member] Foreign Currency Derivatives Derivative [Line Items] Foreign Currency Contracts, Liability, Fair Value Disclosure Foreign Currency Contracts, Liability, Fair Value Disclosure Derivatives Not Designated as Hedging Instruments Foreign Currency Derivative Instruments Not Designated as Hedging Instruments [Abstract] Foreign exchange gains (losses) recorded in Foreign currency transactions and other Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments Foreign currency derivative instruments not designated as hedging instruments at fair value, net Foreign Currency Derivative Instruments Not Designated as Hedging Instruments at Fair Value, Net Foreign exchange derivative assets recorded in Prepaid expenses and other current assets Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value Foreign exchange derivative liabilities recorded in Accrued expenses and other current liabilities Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value Payments for Derivative Instrument Operating Activities Payments for Derivative Instrument Operating Activities The net cash (outflow) for derivative instruments during the period, which are classified as operating activities. Net cash inflow from settlement of derivative contracts included in operating activities Proceeds from Derivative Instrument Operating Activities The net cash inflow from derivative instruments during the period, which are classified as operating activities. Derivatives Designated as Hedging Instruments Foreign Currency Fair Value Hedges [Abstract] Derivative, notional amount Derivative, Notional Amount Derivative Instruments in hedges, net investment in foreign operations, fair value, net Derivative Instruments in Hedges, Net Investment in Foreign Operations, Assets, Fair Value, Net Derivative liabilities recorded in Accrued expense and other current liabilities Derivative Instruments in Hedges, Net Investment in Foreign Operations, Liabilities, Fair Value Derivative assets recorded in Prepaid expenses and other current assets Derivative Instruments in Hedges, Net Investment in Foreign Operations, Assets, Fair Value Payments on foreign currency contracts Payments for Hedge, Investing Activities Statement of Stockholders' Equity [Abstract] Statement, Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock Common Stock [Member] Treasury Stock Treasury Stock [Member] Additional Paid-in Capital Additional Paid-in Capital [Member] Accumulated Earnings Retained Earnings [Member] Accumulated Other Comprehensive Income Accumulated Other Comprehensive Income (Loss) [Member] Increase (Decrease) in Stockholders' Equity Increase (Decrease) in Stockholders' Equity [Roll Forward] Balance Stockholders' Equity Attributable to Parent Balance (in shares) Common Stock, Shares, Outstanding Net income applicable to common stockholders Net Income (Loss) Available to Common Stockholders, Basic Foreign currency translation adjustments, net of tax of $15,345 Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent Unrealized gain on marketable securities, net of tax of $54 Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent Reclassification adjustment for convertible debt in mezzanine Reclassification Adjustment for Convertible Debt in Mezzanine Reclassification adjustment for convertible debt in mezzanine related to accretion in redemption value of convertible debt and adjustment from equity to mezzanine, if debt is convertible. Exercise of stock options and vesting of restricted stock units and performance share units Stock Issued During Period, Value, Share-based Compensation, Gross Exercise of stock options and vesting of restricted stock units and/or performance share units (in shares) Stock Issued During Period, Shares, Share-based Compensation, Gross Repurchase of common stock Treasury Stock, Value, Acquired, Cost Method Repurchase of common stock (in shares) Treasury Stock, Shares, Acquired Stock-based compensation and other stock-based payments Adjustments to Additional Paid in Capital, Share Based Compensation and Other Stock-Based Payments Adjustments to Additional Paid in Capital, Share-based Compensation and Other Stock-Based Payments Conversion of debt Adjustments to Additional Paid in Capital Senior Convertible Notes Converted This elements represents the adjustments to additional paid-in capital for the conversion of convertible debt, including an offset for par value of common stock issued; gain/loss on the conversion; and, if elected by the entity, the cash paid for the conversion premium in excess of the principal amount of the debt. Conversion of debt (in shares) Stock Issued During Period, Shares, Conversion of Convertible Securities Vested stock options assumed in an acquisition Adjustments to Additional Paid in Capital, Other Excess tax benefit on stock-based compensation Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation Balance (in shares) Balance Income Tax Disclosure [Abstract] Income Tax Contingency [Table] Income Tax Contingency [Table] Income Tax Authority [Axis] Income Tax Authority [Axis] Income Tax Authority [Domain] Income Tax Authority [Domain] Internal Revenue Service (IRS) [Member] Internal Revenue Service (IRS) [Member] Income Tax Authority, Name [Axis] Income Tax Authority, Name [Axis] Income Tax Authority, Name [Domain] Income Tax Authority, Name [Domain] Operating Loss and Other Tax Carryforwards, by Source [Axis] Operating Loss and Other Tax Carryforwards, by Source [Axis] Operating loss and other tax carryforwards defined by source. Operating Loss and Other Tax Carryforwards, by Source [Domain] Operating Loss and Other Tax Carryforwards, by Source [Domain] Identifies by name or nature the source of operating loss and other tax carryforwards. Operating losses [Member] Operating Losses [Member] Operating loss carryforwards generated from operating losses. Equity-related transactions [Member] Equity-Related Transactions [Member] Net operating loss carryforwards generated from equity-related transactions, including equity-based compensation and stock warrants. Income Tax Contingency [Line Items] Income Tax Contingency [Line Items] U.S. statutory federal rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Effective income tax rate on qualifying innovative activities at Innovation Box tax rate Effective Income Tax Rate at Innovation Box Tax Rate This element represents the effective income tax rate on qualifying innovative activities under Innovative Box Tax. Dutch statutory rate Dutch Statutory Income Tax Rate 2011 This element represents the Dutch statutory income tax rate in 2011. Estimated aggregate limitation of cumulative net operating losses available net of limit imposed by IRC Section 382 Operating Loss Carryforwards Limitations on Use Estimated Future Aggregate Limitation, Relating to Section 382 The total estimated aggregate NOL, net of limitation, imposed by Section 382 related to the use of all operating loss carryforwards available to reduce future taxable income in the event of a more than 50 percent change in ownership. Net operating loss carryforwards Operating Loss Carryforwards Operating loss carryforwards, expiration date Operating Loss Carryforwards, Expiration Date Other Assets, Noncurrent [Abstract] Other Assets, Noncurrent Disclosure Other Assets, Noncurrent Disclosure [Abstract] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Revolving Credit Facility [Member] Revolving Credit Facility [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] 1.00% Convertible Senior Notes Due March 2018 [Member] Convertible Debt 1.00 Percent Due March 2018 [Member] This element represents the information pertaining to Convertible Senior Notes with interest rate of 1.00 percent due in March 2018 [Member] 1.25% Convertible Senior Notes due March 2015 [Member] Convertible Debt 1.25 Percent Due March 2015 [Member] This element represents the information pertaining to Convertible Senior Notes with interest rate of 1.25 percent due in March 2015. 0.35 % Senior Convertible Notes Due June 2020 [Member] 0.35% Senior Convertible Notes Due June 2020 [Member] 0.35% Senior Convertible Notes Due June 2020 [Member] Debt Conversion Description [Axis] Debt Conversion Description [Axis] Debt Conversion, Name [Domain] Debt Conversion, Name [Domain] Convertible Debt Converted Debt [Member] Convertible Debt Converted Debt [Member] This element represents the borrowing which can be exchanged for a specified amount of another security. Debt Instrument Debt Instrument [Line Items] Aggregate principal amount Debt Instrument, Face Amount Interest rate on Convertible Senior Notes Debt Instrument, Interest Rate, Stated Percentage Line of credit facility, current borrowing capacity Line of Credit Facility, Current Borrowing Capacity Write off of deferred debt issuance cost Write off of Deferred Debt Issuance Cost Investments, Debt and Equity Securities [Abstract] Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities, Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Domain] Major Types of Debt and Equity Securities [Domain] Foreign government securities [Member] Foreign Government Debt Securities [Member] U.S. government securities [Member] US Government Debt Securities [Member] Investment Type [Axis] Investment Type [Axis] Investments [Domain] Investments [Domain] Convertible Debt Securities [Member] Investment, Name [Axis] Investment, Name [Axis] Investment, Name [Domain] Investment, Name [Domain] Ctrip.com International, Ltd. [Member] Ctrip.com International, Ltd. [Member] Ctrip.com International, Ltd. [Member] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Schedule of Available-for-sale Securities Schedule of Available-for-sale Securities [Line Items] Investments, Current Available-for-sale Securities, Current [Abstract] Cost Available-for-sale Debt Securities, Amortized Cost Basis Available For Sale Debt Securities Gross Unrealized Gain Accumulated in Investments Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax Available For Sale Securities Gross Unrealized Loss Accumulated in Investments Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax Fair Value Available-for-sale Securities, Debt Securities, Current Available-for-sale Securities, Debt Securities Available-for-sale Securities, Debt Securities Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Awards assumed in acquisitions [Member] Awards assumed in acquisitions [Member] Awards assumed in acquisitions [Member] Employee Stock Option [Member] Employee Stock Option [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Stock options exercised, total intrinsic value Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value Assumed unvested employee stock options vesting during period (in shares) ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedinPeriodNumberOfShares ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedinPeriodNumberOfShares Fair value of stock options vested during the period Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value Stock-based compensation expense Allocated Share-based Compensation Expense Stock-based compensation expense not yet recognized Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options Total future compensation cost related to Stock Options, expected period of recognition Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Activity of unvested restricted stock units and performance share units Schedule of Nonvested Share Activity [Table Text Block] Schedule of share-based compensation, stock options, activity Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] STOCK-BASED EMPLOYEE COMPENSATION Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Subsequent Event [Table] Subsequent Event [Table] OpenTable [Member] OpenTable [Member] OpenTable [Member] Subsequent Event [Line Items] Subsequent Event [Line Items] Business Combination, Consideration Transferred Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net Business Acquisition Purchase Price Net Of Cash Acquired Business Acquisition Purchase Price Net Of Cash Acquired Business Acquisition Purchase Price Net Of Cash Acquired Business Acquisition, Share Price Business Acquisition, Share Price Payments to Acquire Businesses, Gross Payments to Acquire Businesses, Gross Long-term Debt Long-term Debt Business Combination, Consideration Transferred, Equity Interests Issued and Issuable Business Combination, Consideration Transferred, Equity Interests Issued and Issuable Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Accounts receivable, allowance for doubtful accounts Allowance for Doubtful Accounts Receivable, Current Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Common stock, authorized shares (in shares) Common Stock, Shares Authorized Common stock, shares issued (in shares) Common Stock, Shares, Issued Treasury stock, shares (in shares) Treasury Stock, Shares Income Statement [Abstract] Agency revenues Agency Revenue Agency revenues are derived from travel related transactions where the entity is not the merchant of record and where the prices of services are determined by third parties. Agency revenues include travel commissions, customer processing fees and GDS reservation booking fees related to certain of the services listed above and are reported at the net amounts received, without any associated cost of revenue. Merchant revenues Merchant Revenue Merchant revenues are derived from transactions where the entity is the merchant of record and, among other things, selects suppliers and determines the price accepted from the customer. Merchant revenues include (1) transaction revenues representing the selling price of Name Your Own Price ("NYOP") hotel rooms, rental cars and airline tickets and price-disclosed vacation packages (merchant revenues for NYOP services are booked on a gross basis and recognized when the entity fulfills the customer's non-refundable offer); (2) transaction revenues representing the amount charged to a customer, less the amount charged by suppliers in connection with hotel room reservations and rental car reservations provided through the entity's merchant price-disclosed hotel service (recognized on a net basis at the conclusion of the customer's hotel stay); (3) customer processing fees charged in connection with the sale of airline tickets, hotel rooms and rental cars and merchant price-disclosed hotels; and (4) ancillary fees, including GDS (global distribution system) reservation booking fees related to certain of the services listed above. Advertising and other revenues Other Revenue, Net Total revenues Revenue, Net Cost of revenues Cost of Goods and Services Sold Gross profit Gross Profit Operating expenses: Operating Expenses [Abstract] Advertising — Online Online Advertising Expense Online advertising expenses primarily consist of the costs of, search engine keyword purchases; affiliate programs; banner and pop-up advertisements; and e-mail campaigns for the period, which are expenses incurred with the objective of increasing revenue. Advertising — Offline Offline Advertising Expense Offline advertising expenses primarily consist of the expenses associated with domestic television, print and radio advertising; and the cost for creative talent, production costs and agency fees for television, print and radio advertising for the period, which are expenses incurred with the objective of increasing revenue. Sales and marketing Selling and Marketing Expense Personnel, including stock-based compensation of $35,168, $34,736, $73,971 and $56,445, respectively Labor and Related Expense General and administrative General and Administrative Expense Information technology Communications and Information Technology Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Total operating expenses Operating Expenses Operating income Operating Income (Loss) Other income (expense): Nonoperating Income (Expense) [Abstract] Interest income Investment Income, Interest Interest expense Interest Expense Foreign currency transactions and other Foreign Currency Transactions and Other Includes foreign exchange gains/losses and fees associated with foreign currency transactions and gains/losses on foreign currency derivative contracts. Also includes gains/losses on the early extinguishment of debt and other non-operating income/expense. Total other income (expense) Nonoperating Income (Expense) Earnings before income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items Income tax expense Income Tax Expense (Benefit) Net income Less: net income attributable to noncontrolling interests Net Income (Loss) Attributable to Redeemable Noncontrolling Interest Net income applicable to common stockholders Net income applicable to common stockholders per basic common share Earnings Per Share, Basic Net income applicable to common stockholders per diluted common share Earnings Per Share, Diluted Weighted average number of diluted common shares outstanding ACCUMULATED OTHER COMPREHENSIVE INCOME Comprehensive Income (Loss) Note [Text Block] Balances for each classification of accumulated other comprehensive income (loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Noncontrolling Interest [Abstract] REDEEMABLE NONCONTROLLING INTERESTS Noncontrolling Interest Disclosure [Text Block] INCOME TAXES Income Tax Disclosure [Text Block] Debt Disclosure [Abstract] Schedule of convertible debt Schedule of Convertible Senior Notes [Table Text Block] This element represents the details of convertible senior notes such as amount outstanding, unamortized debt discount and carrying value. FAIR VALUE MEASUREMENTS Fair Value Disclosures [Text Block] Deferred debt issuance costs Unamortized Debt Issuance Expense Security deposits Deposits Assets, Noncurrent Other Other Assets, Miscellaneous, Noncurrent Total Other Assets, Noncurrent Subsequent Event [Member] Subsequent Event [Member] Convertible Notes [Member] Convertible Notes [Member] Debt notes that can be exchanged for equity of the Debt issuer at the option of the issuer or the holder. Convertible Debt Liability [Member] Convertible Debt Liability [Member] The effective interest rate on the liability component of convertible debt instrument which will be settled in cash. Adjustments to Additional Paid-in Capital, Equity Component of Convertible Debt, Subsequent Adjustments Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt, Subsequent Adjustments Debt Conversion Cash Delivered for Principal Due on Converted Debt Debt Conversion Cash Delivered for Principal Due on Converted Debt Amount of the total cash delivered for principal due on converted debt during the period. Debt Conversion, Converted Instrument, Shares Issued Debt Conversion, Converted Instrument, Shares Issued Estimated market value of outstanding convertible debt Debt Instrument, Fair Value Disclosure Description of Senior Notes Debt Instrument Conversion Terms [Abstract] -- None. No documentation exists for this element. -- Unamortized debt discount Debt Instrument, Unamortized Discount Debt financing costs paid Payments of Debt Issuance Costs Convertible debt conversion price (in dollars per share) Debt Instrument, Convertible, Conversion Price Minimum and Maximum consecutive days the closing sales price of common stock must exceed a specified percentage of conversion price to trigger conversion feature of note (in days) Debt Instrument, Convertible, Threshold Consecutive Trading Days Ratio of closing share price to conversion price as a condition for conversion of convertible 2015 Senior Notes, minimum Percentage On Conversion Price Of Closing Price Of Common Stock Traded For At Least 20 Trading Days Out Of 30 Consecutive Trading Days In The Period On Last Trading Day Of Previous Quarter This element represents one of the conditions for conversion of convertible notes at the option of the holder in addition to occurrence of specified events. Additional Payment To Debt Holder Settled In Shares Aggregate Value Of Shares Additional Payment To Debt Holder Settled In Shares Aggregate Value Of Shares This element represents the estimated aggregate value of additional shares that the entity would be required to pay in the event that all or substantially all of the entity's common stock is acquired on or prior to the maturity of the specified convertible notes in a transaction in which the consideration paid to holders of the entity's common stock consists of all or substantially all cash. Debt discount related to convertible notes, net of tax Debt Instrument Convertible Carrying Amount Of The Equity Component Related To Debt Discount Net Of Tax The carrying amount of the equity component of convertible debt related to debt discount, net of tax. Debt discount related to convertible notes, before tax Debt Instrument, Convertible, Carrying Amount of Equity Component Finance costs related to convertible notes, net of tax DebtInstrument Convertible Carrying Amount Of The Equity Component Related To Finance Costs Net Of Tax The carrying amount of the equity component of convertible debt related to finance costs, net of tax. Interest expense related to convertible notes Interest Expense, Debt Contractual coupon interest related to convertible notes included in interest expense Debt Instrument, Convertible Contractual Coupon Interest This element represents contractual coupon interest recognized during the period included in interest expense related to convertible debt instruments. Amortization of debt discount included in interest expense Amortization of Debt Discount (Premium) Amortization of debt issuance costs Amortization of Financing Costs Effective interest rate at debt origination or modification Debt Instrument, Interest Rate, Effective Percentage Gains (Losses) on Extinguishment of Debt Gains (Losses) on Extinguishment of Debt Extinguishment of Debt, Gain (Loss), Net of Tax Extinguishment of Debt, Gain (Loss), Net of Tax Statement of Stockholders' Equity [Abstract] Components of other assets Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block] Reconciliation of the weighted average number of shares outstanding used in calculating diluted earnings per share Schedule of Weighted Average Number of Shares [Table Text Block] Statement of Cash Flows [Abstract] OPERATING ACTIVITIES: Net Cash Provided by (Used in) Operating Activities [Abstract] Net income Adjustments to reconcile net income to net cash provided by operating activities: Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation Depreciation, Nonproduction Provision for uncollectible accounts, net Provision for Doubtful Accounts Deferred income taxes Deferred Income Tax Expense (Benefit) Stock-based compensation expense and other stock-based payments Share-based Compensation and Other Stock-based Expense The aggregate amount of noncash, equity-based employee remuneration and other stock-based expense. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. Amortization of debt issuance costs Amortization of Financing Costs and Write-off of Unamortized Discount Due to Early Debt Conversions The component of interest expense comprised of the periodic charge against earnings over the life of the financing arrangement to which such costs relate and, write-off of unamortized discount related to early debt conversions. Amortization of debt discount Loss on early extinguishment of debt Changes in assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Accounts receivable Increase (Decrease) in Accounts Receivable Prepaid expenses and other current assets Increase (Decrease) in Prepaid Expense and Other Assets Accounts payable, accrued expenses and other current liabilities Increase (Decrease) in Operating Liabilities Other Increase (Decrease) in Other Operating Assets and Liabilities, Net 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 [Abstract] Purchase of investments Payments to Acquire Investments Proceeds from sale of investments Proceeds from Sale and Maturity of Available-for-sale Securities Additions to property and equipment Payments to Acquire Property, Plant, and Equipment Acquisitions and other equity investments, net of cash acquired Payments to Acquire Businesses and Interest in Affiliates Proceeds from settlement of foreign currency contracts Proceeds from Hedge, Investing Activities Payments on foreign currency contracts Change in restricted cash Increase (Decrease) in Restricted Cash Net cash provided by (used in) investing activities Net Cash Provided by (Used in) Investing Activities, Continuing Operations FINANCING ACTIVITIES: Net Cash Provided by (Used in) Financing Activities [Abstract] Proceeds from the issuance of convertible debt Proceeds from Issuance of Long-term Debt Payment of debt issuance costs Payments of Financing Costs Payments related to conversion of senior notes Payments Related to Conversion of Senior Notes The cash outflow from the repayment of the aggregate principal amount of convertible debt which is converted prior to maturity because it is redeemable at the option of the bond holder. If elected by the entity, it also includes cash paid for the conversion value in excess of the principal amount. Repurchase of common stock Payments for Repurchase of Common Stock Payments to purchase subsidiary shares from noncontrolling interests Payments for Repurchase of Redeemable Noncontrolling Interest Payments of stock issuance costs Payments of Stock Issuance Costs Proceeds from exercise of stock options Proceeds from Stock Options Exercised Excess tax benefit on stock-based compensation Excess Tax Benefit from Share-based Compensation, Financing Activities Net cash (used in) provided by 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 in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents, beginning of period Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents, end of period SUPPLEMENTAL CASH FLOW INFORMATION: Supplemental Cash Flow Information [Abstract] Cash paid during the period for income taxes Income Taxes Paid, Net Cash paid during the period for interest Interest Paid, Net Non-cash fair value increase for redeemable noncontrolling interests Redeemable Noncontrolling Interests Fair Value Adjustment, Net of Tax This element represents the effect due to a change in redeemable noncontrolling interest during the period as a result of change in the fair value of redeemable noncontrolling interest. Other Significant Noncash Transaction, Investing activities, Contingent Consideration Other Significant Noncash Transaction, Investing activities, Contingent Consideration Other Significant Noncash Transaction, Investing activities, Contingent Consideration Non-cash financing activity for acquisitions Other Significant Noncash Transaction, Value of Consideration Given Other Assets Other Assets Disclosure [Text Block] NET INCOME PER SHARE Earnings Per Share [Text Block] INVESTMENTS Available-for-sale Securities [Table Text Block] Equity [Abstract] Treasury Stock Acquired Repurchase Authorization Additional Value Treasury Stock Acquired Repurchase Authorization Additional Value Maximum value of additional common stock to be repurchased authorized by the entity's board of directors, which includes $100 million from the proceeds of notes issued in March 2010. Treasury Stock Shares Acquired Excluding Shares Paid for Tax Withholding for Share-based Compensation Treasury Stock Shares Acquired Excluding Shares Paid for Tax Withholding for Share-based Compensation Number of shares that have been repurchased during the period and are being held in treasury excluding the number of shares employees use to pay the employer who has or will pay the employees' income tax withholding obligations as part of a net-share settlement of share-based awards. Treasury Stock Value Acquired, Cost Method Excluding Shares Paid Value for Tax Withholding for Share-based Compensation Treasury Stock Value Acquired, Cost Method Excluding Shares Paid Value for Tax Withholding for Share-based Compensation Equity impact of the cost of common and preferred stock that were repurchased during the period excluding the value of shares employees use to pay the employer who has or will pay the employees' income tax withholding obligations as part of a net-share settlement of share-based awards. Recorded using the cost method. Repurchase of common shares to satisfy employee withholding tax obligations related to stock-based compensation (in shares) Shares Paid for Tax Withholding for Share Based Compensation Repurchase of common shares to satisfy employee withholding tax obligations related to stock-based compensation Adjustments Related to Tax Withholding for Share-based Compensation Remaining authorization of repurchase common stock Stock Repurchase Program, Remaining Authorized Repurchase Amount Short-term investments Investment [Table Text Block] Convertible Debt Convertible Debt [Abstract] Outstanding Principal Amount Long-term Debt, Gross Unamortized Debt Discount Carrying Value Convertible Debt Income Statement [Abstract] Allocated Share-based Compensation Expense Revolving Credit Facility Line of Credit Facility [Abstract] Swingline Loans [Member] Swingline Loans [Member] Same-day cash available as part of our revolving credit facility, referred to as Swingline Loans Letter of Credit [Member] Letter of Credit [Member] Line of Credit Rate [Axis] Line of Credit Rate [Axis] Line of Credit Rate [Axis] Line of Credit Rate [Domain] Line of Credit Rate [Domain] Line of Credit Rate [Domain] Rate 1 [Member] Rate 1 [Member] Rate 1 [Member] Rate 2B [Member] Rate 2B [Member] Rate 2A [Member] Rate 2C [Member] Rate 2C [Member] Rate 2C [Member] Debt Instrument, Variable Rate Base [Axis] Variable Rate [Axis] Debt Instrument, Variable Rate Base [Domain] Variable Rate [Domain] London Interbank Offered Rate (LIBOR) [Member] London Interbank Offered Rate (LIBOR) [Member] One month LIBOR [Member] One Month LIBOR [Member] The One Month London Interbank Offered Rate (LIBOR) used to calculate the variable interest rate of the debt instrument. Federal funds rate [Member] Federal Funds Purchased [Member] Revolving credit facility, maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Period of revolving credit facility (in years) Debt Instrument, Term Basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate Commitment fee rate Line of Credit Facility, Unused Capacity, Commitment Fee Percentage Letters of credit issued Letters of Credit Outstanding, Amount Line of credit, interest rate description Line of Credit Facility, Interest Rate Description Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Series of Individually Immaterial Business Acquisitions [Member] Series of Individually Immaterial Business Acquisitions [Member] Business Acquisition [Line Items] Business Acquisition [Line Items] Payments to Acquire Businesses, Net of Cash Acquired Payments to Acquire Businesses, Net of Cash Acquired Business Combination, Contingent Consideration, Liability Business Combination, Contingent Consideration, Liability Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High Business Acquisition, Transaction Costs Business Acquisition, Transaction Costs Restricted Stock Units and Performance Share Units [Member] Restricted Stock Units (RSUs) [Member] Restricted Stock Units (RSUs) [Member] Performance Share Units 2014 Grants [Member] Performance Share Units 2014 Grants [Member] Performance Share Units 2014 Grants [Member] Performance Share Units 2013 Grants [Member] Performance Share Units 2013 Grants [Member] pcln_Performance Share Units 2013 Grants [Member] Performance Share Units 2012 Grants [Member] Performance Share Units 2012 Grants [Member] Performance Share Units 2012 Grants [Member] Total unrecognized estimated compensation expense, unvested share-based awards Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Total future compensation cost related to unvested Share-Based Awards, expected period of recognition Vesting period (in years) Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period Unvested at June 30, 2014 Grant date fair value Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Fair Value The fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). Estimated number of probable shares to be issued (in shares) Share-based Compensation Arrangement by Share-based Payment Award Equity Instruments Other than Options Estimated Shares to be Issued As of the balance sheet date, the estimated number of probable shares to be issued at the end of the performance period under performance share units. Maximum shares that could be issued (in shares) Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Number Of Shares To Be Issued On Meeting Performance Thresholds, Maximum As of the balance sheet date, the number of probable shares to be issued at the end of the performance period under performance share units on meeting the defined performance thresholds. Minimum shares that could be issued (in shares) Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Number Of Shares To Be Issued On Meeting Performance Thresholds, Minimum Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Number Of Shares To Be Issued On Meeting Performance Thresholds, Minimum Exercised (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Exercised (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Ending balance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Weighted Average Exercise Price (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Weighted Average Remaining Contractual Term Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Aggregate Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value INTANGIBLE ASSETS AND GOODWILL Goodwill and Intangible Assets Disclosure [Text Block] Foreign currency translation adjustments, net of tax (1) Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax Net unrealized gain on marketable securities, net of tax (2) Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax Net gains (losses) from fair value adjustments associated with net investment hedges, after tax Cumulative Translation Adjustment for Net Investment Hedge, Net of Tax Cumulative translation adjustment in other comprehensive income reflecting gains or losses on foreign currency derivatives that are designated as, and are effective as, hedges of a net investment in a foreign entity, net of tax effect. Net gains (losses) from fair value adjustments associated with net investment hedges, before tax Cumulative Translation Adjustment for Net Investment Hedge, before Tax Cumulative translation adjustment in other comprehensive income reflecting gains or losses on foreign currency derivatives that are designated as, and are effective as, hedges of a net investment in a foreign entity, before tax effect. Net unrealized gain (loss) on investment securities, before tax Accumulated Other Comprehensive Income (Loss) Available For Sale Securities Adjustments, Pre Tax Accumulated appreciation or loss, before tax, in value of the total of unsold securities at the end of an accounting period. Number of Shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Beginning balance (in shares) Assumed in acquisition Share-based Compensation Arrangement by Share-based Payment Award, Options, Other Increases (Decreases) in Period Exercised (in shares) Forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Beginning balance (in dollars per share) Assumed (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Other Share Increase (Decrease) in Period, Weighted Average Exercise Price Forfeited (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Ending balance (in dollars per share) Weighted Average Remaining Contractual Term Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Vested and exercisable as of June 30, 2014 Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] Number of Shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Weighted Average Exercise Price (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Aggregate Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Vested and exercisable as of June 30, 2014 and expected to vest thereafter, net of estimated forfeitures Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract] Number of Shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number Weighted Average Exercise Price (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price Aggregate Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value Weighted Average Remaining Contractual Term Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term Document and Entity Information [Abstract] -- None. No documentation exists for this element. -- Document Information [Table] Document Information [Table] Document Information, Document [Axis] Document Information, Document [Axis] Document [Domain] Document [Domain] Document Information [Line Items] Document Information [Line Items] Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Document Type Document Type Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Amendment Flag Amendment Flag Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Voluntary Filers Entity Current Reporting Status Entity Current Reporting Status Entity Public Float Entity Public Float Financial instruments carried at fair value Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] BASIS OF PRESENTATION Nature of Operations [Text Block] Intangible assets Schedule of Finite-Lived Intangible Assets [Table Text Block] Annual estimated amortization expense for intangible assets for the remainder of 2014, the next five years and thereafter Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Goodwill Schedule of Goodwill [Table Text Block] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Measurement Basis [Axis] Measurement Basis [Axis] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Level 2 [Member] Fair Value, Inputs, Level 2 [Member] 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] ASSETS: Assets, Fair Value Disclosure [Abstract] Short-term investments Foreign exchange derivatives Foreign Currency Contract, Asset, Fair Value Disclosure Total assets at fair value Assets, Fair Value Disclosure LIABILITIES: Liabilities, Fair Value Disclosure [Abstract] Foreign exchange derivatives Reconciliation of redeemable noncontrolling interests Redeemable Noncontrolling Interest [Table Text Block] COMMITMENTS AND CONTINGENCIES Commitments and Contingencies Disclosure [Text Block] DEBT Debt Disclosure [Text Block] Redeemable Noncontrolling Interest, by Legal Entity [Table] Redeemable Noncontrolling Interest, by Legal Entity [Table] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Priceline.com International Limited (PIL) Pricelinecom International Limited [Member] Wholly-owned subsidiary of Priceline.com Incorporated. Travel Jigsaw Holdings Limited [Member] Travel Jigsaw Holdings Limited [Member] Represents the acquisition of Traveljigsaw Holdings Limited. Redeemable noncontrolling interest Redeemable Noncontrolling Interest [Line Items] Acquisition of Controlling and Redeemable Controlling Interest Business Acquisitions [Abstract] -- None. No documentation exists for this element. -- Percent purchased, by certain key members of the management team of Booking.com, of ownership interest in TravelJigsaw from PIL (as a percent) Redeemable Noncontrolling Interest Ownership Interest Purchased from Parent by Key Management Team Members of Subsidiary Percentage of ownership interest in new subsidiary purchased from parent by key members of an existing wholly-owned subsidiary management team which, combined with the shares held by the management team of the newly acquired subsidiary, represent the redeemable shares. The holders of the redeemable shares have the right to put their shares to the parent company and the parent company has the right to call the shares in each case at a purchase price reflecting the fair value of the redeemable shares at the time of exercise. Noncontrolling interests, aggregate purchase price of remaining outstanding shares Reconciliation of redeemable noncontrolling interests Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward] Balance, beginning of period Redeemable Noncontrolling Interest, Equity, Common, Fair Value Net income attributable to noncontrolling interests Fair value adjustments (1) Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests Currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Noncontrolling Interest Balance, end of period TREASURY STOCK Treasury Stock [Text Block] ASSETS Assets [Abstract] Current assets: Assets, Current [Abstract] Cash and cash equivalents Restricted cash Restricted Cash and Cash Equivalents, Current Accounts receivable, net of allowance for doubtful accounts of $14,592 and $14,116, respectively Accounts Receivable, Net, Current Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Deferred income taxes Deferred Tax Assets, Net of Valuation Allowance, Current Total current assets Assets, Current Property and equipment, net Property, Plant and Equipment, Net Intangible assets, net Goodwill Deferred income taxes Deferred Tax Assets, Net of Valuation Allowance, Noncurrent Other assets Total assets Assets LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities and Equity [Abstract] Current liabilities: Liabilities, Current [Abstract] Accounts payable Accounts Payable, Current Accrued expenses and other current liabilities Accrued Liabilities, Current Deferred merchant bookings Deferred Merchant Bookings This relates to transactions where the entity's customers purchase hotel room reservations or car rental reservations from suppliers at price-disclosed rates. Charges are billed to the customer at the time of booking. Merchant revenue (the difference between the selling price and the cost of the hotel room reservation or car rental reservation) and the accounts payable to the supplier are recognized at the conclusion of the customer's stay at the hotel or when the customer returns the rental car as amounts collected are generally refundable upon cancellation prior to the hotel stay or rental car pick-up. Convertible debt (see Note 8) Convertible Debt Liability The current liability portion of the carrying value of long-term convertible debt that is redeemable at the balance sheet date. The current liability plus mezzanine (temporary equity) represents the aggregate principal amount of convertible debt as of the balance sheet date that will be settled in cash. Total current liabilities Liabilities, Current Deferred income taxes Deferred Tax Liabilities, Net, Noncurrent Other long-term liabilities Other Liabilities, Noncurrent Convertible debt (see Note 8) Convertible Debt Liability Noncurrent The noncurrent liability portion of long-term convertible debt that is not redeemable as of the balance sheet date that will be settled in cash. Total liabilities Liabilities Convertible debt (see Note 8) Convertible Debt Equity The equity component of convertible debt that will be settled in cash which has been reclassified to mezzanine (temporary equity) because the debt is redeemable at the reporting date. Stockholders' equity: Stockholders' Equity Attributable to Parent [Abstract] Common stock, $0.008 par value; authorized 1,000,000,000 shares, 61,770,386 and 61,265,160 shares issued, respectively Common Stock, Value, Issued Treasury stock, 9,329,553 and 9,256,721 shares, respectively Treasury Stock, Value Additional paid-in capital Additional Paid in Capital Accumulated earnings Retained Earnings (Accumulated Deficit) Accumulated other comprehensive income Total stockholders' equity Total liabilities and stockholders' equity Liabilities and Equity