Maximum Ownership Percentage in Ctrip

No definition available.

Name:	pcln_MaximumOwnershipPercentageinCtrip
Namespace Prefix:	pcln_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Period over which Ctrip ADSs can be acquired by Priceline in order to reach the 10% ownership cap.

+ References

No definition available.

+ Details

Name:	pcln_PeriodoverwhichCtripADSscanbeacquired
Namespace Prefix:	pcln_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 5

-Subparagraph (aa)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_AvailableForSaleSecuritiesAbstract
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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563

+ Details

Name:	us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.2)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Details

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Namespace Prefix:
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Period Type:

- Details

Name:	us-gaap_InvestmentTypeAxis=us-gaap_ShortTermInvestmentsMember
Namespace Prefix:
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Period Type:

- Details

Name:	us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=pcln_Ctrip.comInternationalLtd.Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

INVESTMENTS (Details) (USD $) In Thousands, unless otherwise specified	1 Months Ended
	Aug. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
Short-term Investments
Investments
Cost		$ 1,142,881	$ 5,462,613
Gross Unrealized Gains		39	483
Gross Unrealized Losses		(738)	(376)
Fair Value		1,142,182	5,462,720
Short-term Investments \| Foreign government securities
Investments
Cost		52,524	4,019,530
Gross Unrealized Gains		0	233
Gross Unrealized Losses		(34)	(356)
Fair Value		52,490	4,019,407
Short-term Investments \| U.S. government securities
Investments
Cost		364,276	1,443,083
Gross Unrealized Gains		24	250
Gross Unrealized Losses		(34)	(20)
Fair Value		364,266	1,443,313
Short-term Investments \| U.S. commercial paper
Investments
Cost		621,252
Gross Unrealized Gains		15
Gross Unrealized Losses		(652)
Fair Value		620,615
Short-term Investments \| U.S. government agency securities
Investments
Cost		104,829
Gross Unrealized Gains		0
Gross Unrealized Losses		(18)
Fair Value		104,811
Long-term Investments
Investments
Cost		3,920,019
Gross Unrealized Gains		2,476
Gross Unrealized Losses		(166,842)
Fair Value		3,755,653
Long-term Investments \| Foreign government securities
Investments
Cost		12,707
Gross Unrealized Gains		0
Gross Unrealized Losses		(36)
Fair Value		12,671
Long-term Investments \| U.S. government securities
Investments
Cost		557,130
Gross Unrealized Gains		80
Gross Unrealized Losses		(762)
Fair Value		556,448
Long-term Investments \| U.S. corporate debt securities
Investments
Cost		2,332,030
Gross Unrealized Gains		2,299
Gross Unrealized Losses		(5,296)
Fair Value		2,329,033
Long-term Investments \| U.S. government agency securities
Investments
Cost		95,108
Gross Unrealized Gains		97
Gross Unrealized Losses		(111)
Fair Value		95,094
Long-term Investments \| U.S. municipal securities
Investments
Cost		1,114
Gross Unrealized Gains		0
Gross Unrealized Losses		(12)
Fair Value		1,102
Ctrip.com International, Ltd.
Investments
Debt Investment, Term	5 years
Period over which Ctrip ADSs can be acquired	12 months
Maximum Ownership Percentage in Ctrip	10.00%
Ctrip.com International, Ltd. \| Long-term Investments \| Ctrip corporate debt securities
Investments
Cost	500,000	500,000
Gross Unrealized Gains		0
Gross Unrealized Losses		(74,039)
Fair Value		425,961
Ctrip.com International, Ltd. \| Long-term Investments \| Ctrip equity securities
Investments
Cost		421,930
Gross Unrealized Gains		0
Gross Unrealized Losses		(86,586)
Fair Value		$ 335,344