Represents the number of cities from which the entity has received notices of audits or administrative procedures.

No definition available.

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

- Definition

Represents the number cities and counties from which the entity has received notices of audits or administrative procedures.

+ References

No definition available.

+ Details

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

- Definition

This element represents the number of municipalities or counties which have initiated audit proceedings.

+ References

No definition available.

+ Details

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

- Definition

Of the administrative and audit proceedings that were pending at period end, this element represents the number which commenced during the period.

+ References

No definition available.

+ Details

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

- Definition

This element represents the number of states which have initiated audit proceedings.

+ References

No definition available.

+ Details

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

- Definition

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

+ References

No definition available.

+ Details

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

- 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

UK OFT Inquiry Potential Infringement Decision

+ References

No definition available.

+ Details

Name:	pcln_UkOftInquiryPotentialInfringementDecision
Namespace Prefix:	pcln_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

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

- Definition

The carrying amount as of the balance sheet date of the combined total of loss contingency liabilities.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 5

-Paragraph 9, 10, 11, 12

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: 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=6952336&loc=d3e14326-108349

+ Details

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

COMMITMENTS AND CONTINGENCIES (Details) (USD $)	3 Months Ended					1 Months Ended	3 Months Ended
COMMITMENTS AND CONTINGENCIES (Details) (USD $)	Jun. 30, 2012 Litigation Related to Hotel Occupany and Other Taxes [Member] Cases	Jun. 30, 2012 Minimum [Member] Litigation Related to Hotel Occupany and Other Taxes [Member] GovernmentalUnit	Jun. 30, 2012 US Merchant Hotel Business [Member] Litigation Related to Hotel Occupany and Other Taxes [Member]	Dec. 31, 2011 US Merchant Hotel Business [Member] Litigation Related to Hotel Occupany and Other Taxes [Member]	Jun. 30, 2012 State of California [Member] Minimum [Member] Litigation Related to Hotel Occupany and Other Taxes [Member] GovernmentalUnit	Jul. 31, 2009 City of San Francisco [Member] Litigation Related to Hotel Occupany and Other Taxes [Member]	Jun. 30, 2012 City of San Francisco [Member] Litigation Related to Hotel Occupany and Other Taxes [Member]	Jun. 30, 2012 Cities in Arizona Other then Pheonix [Member] Litigation Related to Hotel Occupany and Other Taxes [Member]	Jun. 30, 2012 Utah [Member] Litigation Related to Hotel Occupany and Other Taxes [Member]	Jun. 30, 2012 COLORADO Litigation Related to Hotel Occupany and Other Taxes [Member] GovernmentalUnit	Jul. 31, 2012 Bookingcom BV [Member] Minimum [Member]	Jul. 31, 2012 Bookingcom BV [Member] Maximum [Member]
Hotel Occupany and Other Taxes
Approximate number of lawsuits brought by or against states, cities and counties over issues involving the payment of hotel occupancy and other taxes (in cases)	45
Number of consumer class actions (in cases)	1
Minimum number of states which have initiated audit proceedings (in governmental units)		8
Minimum number of municipalities and counties which have initiated audit proceedings (in governmental units)		70			40				5
Assessed taxes including interest and penalties (in dollars)						$ 3,400,000	$ 2,500,000
Reserve for the potential resolution of issues related to hotel occupancy and other taxes (in dollars)			33,000,000	33,000,000
Number of currently pending administrative proceedings that commenced in period (in cases)	2
Audit notices and administrative procedures, number of cities					40			12
Loss Contingencies, Audit Notices Received Number of Cities and Counties										15
UK OFT Inquiry Potential Infringement Decision											$ 0	$ 50,000,000