Acquisition of land use rights

No definition available.

Name:	pcln_Acquisitionoflanduserights
Namespace Prefix:	pcln_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

This element represents the number of lawsuits in which the reporting entity was involved.

+ References

No definition available.

+ Details

Name:	pcln_LossContingencyNumberOfLawsuits
Namespace Prefix:	pcln_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the tax assessment issued by the tax authority including interest and penalties.

+ References

No definition available.

+ Details

Name:	pcln_LossContingencyTaxInterestandPenaltiesAssessed
Namespace Prefix:	pcln_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Payment required to appeal a litigation matter

+ References

No definition available.

+ Details

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Namespace Prefix:	pcln_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Pricing Parity Working Group

+ References

No definition available.

+ Details

Name:	pcln_PricingParityWorkingGroup
Namespace Prefix:	pcln_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of units of account associated with a transaction

+ References

No definition available.

+ Details

Name:	pcln_Unitsofaccount
Namespace Prefix:	pcln_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid.

+ References

+ Details

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

- Definition

For contingent consideration arrangements and indemnification assets recognized in connection with a business combination, this element represents an estimate of the low-end of the potential range (undiscounted) of the consideration which may be paid.

+ References

+ Details

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

- Definition

Amount of liability recognized arising from contingent consideration in a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 35
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 25
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476

+ Details

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

- Definition

Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments.

+ References

No definition available.

+ Details

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

- Definition

Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980

+ Details

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

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of loss contingency liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349

+ Details

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

- Definition

The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- 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

+ Details

Name:	us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LossContingenciesByNatureOfContingencyAxis=pcln_FrenchTaxAuditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=pcln_Booking.comMember
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- Details

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Data Type:	na
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Period Type:

- Details

Name:	us-gaap_LeaseArrangementTypeAxis=pcln_GroundLeaseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementScenarioAxis=us-gaap_ScenarioForecastMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	pcln_LitigationRelatedtoTravelTransactionTaxesByGeographicAreaAxis=stpr_HI
Namespace Prefix:
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Balance Type:
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COMMITMENTS AND CONTINGENCIES (Details) € in Millions	1 Months Ended	3 Months Ended	9 Months Ended
COMMITMENTS AND CONTINGENCIES (Details) € in Millions	May 31, 2017 USD ($)	Sep. 30, 2016 EUR (€)	Sep. 30, 2017 USD ($) Cases country	Sep. 30, 2017 EUR (€) country	Sep. 30, 2016 USD ($)	Mar. 31, 2018 EUR (€)	Dec. 31, 2016 USD ($)
Commitments and Contingencies
Pricing Parity Working Group \| country			10	10
Acquisition of land use rights \| $			$ 0		$ 48,494,000
Payments to Acquire Property, Plant, and Equipment \| $			$ 223,692,000		$ 168,076,000
Litigation related to travel transaction taxes [Member]
Commitments and Contingencies
Approximate number of lawsuits brought by or against states, cities and counties over issues involving the payment of travel transaction taxes (in cases) \| Cases			20
Accrual for the potential resolution of issues related to travel transaction taxes (in dollars) \| $			$ 24,000,000				$ 27,000,000
French Tax Audit [Member]
Commitments and Contingencies
Assessed taxes including interest and penalties \| €				€ 356
Series of individually immaterial business acquisitions [Member]
Commitments and Contingencies
Contingent consideration arrangements, range of outcomes, minimum value \| $			0
Contingent consideration arrangements, range of outcomes, maximum value \| $			90,000,000
Booking.com [Member] \| Headquarters [Member]
Commitments and Contingencies
Contractual Obligation for Building Construction \| €		€ 270
Units of account		2
Payments to Acquire Productive Assets \| €		€ 48
Acquisition of land use rights \| €		43
Payments to Acquire Property, Plant, and Equipment \| €		5
Ground Lease [Member] \| Booking.com [Member] \| Headquarters [Member]
Commitments and Contingencies
Contractual Obligation for Building Construction \| €		€ 60
Lessee, Operating Lease, Term of Contract		49 years
Fair Value, Inputs, Level 3 [Member] \| Series of individually immaterial business acquisitions [Member]
Commitments and Contingencies
Contingent consideration liability \| $			$ 9,000,000				$ 9,000,000
Scenario, Forecast [Member] \| Booking.com [Member] \| Headquarters [Member]
Commitments and Contingencies
Contractual Obligation for Building Construction \| €						€ 34
HAWAII \| Litigation related to travel transaction taxes [Member]
Commitments and Contingencies
Payment required to appeal a litigation matter \| $	$ 13,100,000