CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating activities:
Net income	$ 372,950us-gaap_ProfitLoss	$ 216,358us-gaap_ProfitLoss	$ 280,440us-gaap_ProfitLoss
Less: Discontinued operations, net of tax			(22,539)
Net income from continuing operations	372,950	216,358	302,979
Adjustments to reconcile net income from continuing operations to net cash provided by operating activities:
Depreciation of property and equipment, including internal-use software and website development	265,817us-gaap_Depreciation	211,744us-gaap_Depreciation	164,247us-gaap_Depreciation
Amortization of stock-based compensation	85,011us-gaap_ShareBasedCompensation	130,173us-gaap_ShareBasedCompensation	64,596us-gaap_ShareBasedCompensation
Amortization of intangible assets	79,615us-gaap_AmortizationOfIntangibleAssets	71,731us-gaap_AmortizationOfIntangibleAssets	31,705us-gaap_AmortizationOfIntangibleAssets
Deferred income taxes	(79,031)us-gaap_DeferredIncomeTaxExpenseBenefit	(772)us-gaap_DeferredIncomeTaxExpenseBenefit	(55,120)us-gaap_DeferredIncomeTaxExpenseBenefit
Foreign exchange (gain) loss on cash, cash equivalents and short-term investments, net	79,410	56,822	(19,904)
Realized (gain) loss on foreign currency forwards	5,481us-gaap_GainLossOnSaleOfDerivatives	(40,850)us-gaap_GainLossOnSaleOfDerivatives	12,954us-gaap_GainLossOnSaleOfDerivatives
Other	8,966us-gaap_OtherNoncashIncomeExpense	10,576us-gaap_OtherNoncashIncomeExpense	17,521us-gaap_OtherNoncashIncomeExpense
Changes in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable	(157,957)	(127,327)	(84,017)
Prepaid expenses and other current assets	(65,203)	(18,724)	(3,386)
Accounts payable, merchant	110,603	91,503	146,469
Accounts payable, other, accrued expenses and other current liabilities	271,454	(68,239)	294,466
Tax payable/receivable, net	39,971us-gaap_IncreaseDecreaseInIncomeTaxes	(29,746)us-gaap_IncreaseDecreaseInIncomeTaxes	51,472us-gaap_IncreaseDecreaseInIncomeTaxes
Deferred merchant bookings	331,133	246,229	312,059
Deferred revenue	18,739	13,722	1,141
Net cash provided by operating activities from continuing operations	1,366,959	763,200	1,237,182
Investing activities:
Capital expenditures, including internal-use software and website development	(328,387)	(308,581)	(235,697)
Purchases of investments	(1,194,210)us-gaap_PaymentsToAcquireInvestments	(1,216,591)us-gaap_PaymentsToAcquireInvestments	(1,873,519)us-gaap_PaymentsToAcquireInvestments
Sales and maturities of investments	1,162,557	1,502,576	1,955,955
Acquisitions, net of cash acquired	(560,668)	(541,247)	(199,360)
Net settlement of foreign currency forwards	(5,481)	40,850	(12,954)
Other, net	1,932	(2,520)	(2,250)
Net cash provided by (used in) investing activities from continuing operations	(924,257)	(525,513)	(367,825)
Financing activities:
Proceeds from issuance of long-term debt, net of issuance costs	492,894
Purchases of treasury stock	(537,861)	(522,900)	(417,571)
Proceeds from issuance of treasury stock	20,404us-gaap_ProceedsFromSaleOfTreasuryStock	25,273us-gaap_ProceedsFromSaleOfTreasuryStock
Payment of dividends to stockholders	(84,697)us-gaap_PaymentsOfOrdinaryDividends	(75,760)us-gaap_PaymentsOfOrdinaryDividends	(130,423)us-gaap_PaymentsOfOrdinaryDividends
Proceeds from exercise of equity awards and employee stock purchase plan	108,121	56,836	241,193
Excess tax benefit on equity awards	58,156	39,606	41,100
Other, net	(8,868)	(15,571)	(7,086)
Net cash provided by (used in) financing activities from continuing operations	48,149	(492,516)	(272,787)
Net cash provided by (used in) continuing operations	490,851	(254,829)	596,570
Net cash provided by (used in) discontinued operations		13,637	(7,607)
Effect of exchange rate changes on cash and cash equivalents	(109,184)	(30,936)	15,064
Net increase (decrease) in cash and cash equivalents	381,667	(272,128)	604,027
Cash and cash equivalents at beginning of year	1,021,033	1,293,161	689,134
Cash and cash equivalents at end of year	1,402,700	1,021,033	1,293,161
Supplemental cash flow information
Cash paid for interest from continuing operations	87,555us-gaap_InterestPaid	84,136us-gaap_InterestPaid	86,024us-gaap_InterestPaid
Income tax payments, net from continuing operations	$ 70,339us-gaap_IncomeTaxesPaidNet	$ 73,439us-gaap_IncomeTaxesPaidNet	$ 9,632us-gaap_IncomeTaxesPaidNet

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Increase (decrease) in accounts payable, merchant, which primarily consists of amounts billed from suppliers subsequent to the customers use of services.

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No definition available.

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Increase (decrease) in deferred merchant bookings, which consists of amounts received from travelers who have not yet traveled.

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes.

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Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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Amount of increase (decrease) from the effect of exchange rate changes on cash and cash equivalent balances held in foreign currencies.

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Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

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The difference between the book value and the sale price of options, swaps, futures, forward contracts, and other derivative instruments. This element refers to the gain (loss) included in earnings.

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This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses and taxes from ongoing operations before extraordinary items, and noncontrolling interest.

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Amount of income (loss) from a disposal group, net of income tax before extraordinary items allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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The increase (decrease) during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services.

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The increase (decrease) during the reporting period, excluding the portion taken into income, in the liability reflecting revenue yet to be earned for which cash or other forms of consideration was received or recorded as a receivable.

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The increase (decrease) during the reporting period in the amounts payable to taxing authorities for taxes that are based on the reporting entity's earnings, net of amounts receivable from taxing authorities for refunds of overpayments or recoveries of income taxes, and in deferred and other tax liabilities and assets.

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No definition available.

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The increase (decrease) during the reporting period in other obligations or expenses incurred but not yet paid.

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The increase (decrease) during the reporting period in the amount of outstanding money paid in advance for goods or services that bring economic benefits for future periods.

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The amount of cash paid for interest during the period.

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The increase (decrease) in cash associated with the entity's continuing operating, investing, and financing activities. While for technical reasons this element has no balance attribute, the default assumption is a debit balance consistent with its label.

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No definition available.

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Increase (decrease) in cash associated with the entity's discontinued operations.

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Amount of cash inflow (outflow) of financing activities, excluding discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount of cash inflow (outflow) of investing activities, excluding discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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Amount of cash inflow (outflow) from operating activities, excluding discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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Other income (expense) included in net income that results in no cash inflows or outflows in the period. Includes noncash adjustments to reconcile net income (loss) to cash provided by (used in) operating activities that are not separately disclosed.

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The net cash outflow or inflow from derivative instruments during the period, which are classified as financing activities, excluding those designated as hedging instruments.

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- Definition

The net cash outflow or inflow from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

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-Publisher FASB

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-Section 45

-Paragraph 9

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- Definition

The cash outflow to reacquire common stock during the period.

+ References

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Period Type:	duration

- Definition

Cash outflow in the form of ordinary dividends to common shareholders, preferred shareholders and noncontrolling interests, generally out of earnings.

+ References

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- Definition

The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

+ References

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- Definition

The cash outflow associated with the purchase of all investments (debt, security, other) during the period.

+ References

+ Details

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- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

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- Definition

The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

+ References

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- Definition

The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity.

+ References

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- Definition

The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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- Definition

The cash inflow associated with the sale and maturity (principal being due) of other investments, prepayment and call (request of early payment) of other investments not otherwise defined in the taxonomy.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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- Definition

The cash inflow from the issuance of an equity stock that has been previously reacquired by the entity.

+ References

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Data Type:	xbrli:monetaryItemType
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- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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