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INCOME TAXES (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Operating Loss Carryforwards [Line Items]      
International pre-tax income $ 2,900,000,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign $ 2,200,000,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign $ 1,700,000,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
Domestic pre-tax income 98,400,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic 48,500,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic 95,000,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic
Deferred tax assets 8,548,000us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent 7,055,000us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent  
Current deferred tax liabilities 1,200,000us-gaap_DeferredTaxLiabilitiesCurrent 38,000us-gaap_DeferredTaxLiabilitiesCurrent  
Less valuation allowance on deferred tax assets (161,997,000)us-gaap_DeferredTaxAssetsValuationAllowance (173,558,000)us-gaap_DeferredTaxAssetsValuationAllowance  
Valuation allowance related to federal and state net operating loss carryforwards derived from equity transactions 140,400,000pcln_DeferredTaxAssetsValuationAllowanceOperatingLossCarryforwardsDerivedFromEquityTransactions    
Valuation allowance related to international operations 21,600,000pcln_DeferredTaxAssetsValuationAllowanceForeignOperations    
Federal tax deductions related to equity transactions not included in deferred tax assets 250,000,000pcln_ExcessTaxCreditsEquityTransactions    
International earnings for which no U.S. tax provision has been made 7,300,000,000us-gaap_UndistributedEarningsOfForeignSubsidiaries    
Effective income tax rate on qualifying innovative activities at Innovation Box Tax rate (as a percent) 5.00%pcln_EffectiveIncomeTaxRateAtInnovationBoxTaxRate    
Statutory federal rate (as a percent) 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate    
Federal      
Operating Loss Carryforwards [Line Items]      
Maximum change in ownership percentage allowed before statutory limitations imposed on the availability of net operating losses (as a percent) 50.00%pcln_OperatingLossCarryforwardsLimitationsOnUseMinimumPercentageOwnershipChangeRelatingToSection382
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_InternalRevenueServiceIRSMember		    
Estimated aggregate limitation of cumulative net operating losses available net of limit imposed by IRC Section 382 1,200,000,000pcln_OperatingLossCarryforwardsLimitationsOnUseEstimatedFutureAggregateLimitationRelatingToSection382
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_InternalRevenueServiceIRSMember		    
Federal | Operating loss      
Operating Loss Carryforwards [Line Items]      
Net operating loss carryforwards 22,000,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_InternalRevenueServiceIRSMember
/ us-gaap_TaxCreditCarryforwardAxis
= us-gaap_GeneralBusinessMember		    
Federal | Equity-related      
Operating Loss Carryforwards [Line Items]      
Net operating loss carryforwards 1,200,000,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_InternalRevenueServiceIRSMember
/ us-gaap_TaxCreditCarryforwardAxis
= us-gaap_InvestmentCreditMember		    
State | Operating loss      
Operating Loss Carryforwards [Line Items]      
Net operating loss carryforwards 673,400,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
/ us-gaap_TaxCreditCarryforwardAxis
= us-gaap_GeneralBusinessMember		    
Foreign      
Operating Loss Carryforwards [Line Items]      
Net operating loss carryforwards 131,200,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember		    
Foreign | Operating loss      
Operating Loss Carryforwards [Line Items]      
Net operating loss carryforwards 49,300,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember
/ us-gaap_TaxCreditCarryforwardAxis
= us-gaap_GeneralBusinessMember		    
Foreign | Capital allowance      
Operating Loss Carryforwards [Line Items]      
Other tax carryforwards 1,700,000us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember
/ us-gaap_TaxCreditCarryforwardAxis
= us-gaap_CapitalLossCarryforwardMember		    
Canada | Operating loss      
Operating Loss Carryforwards [Line Items]      
Net operating loss carryforwards 3,700,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= country_CA
/ us-gaap_TaxCreditCarryforwardAxis
= us-gaap_GeneralBusinessMember		    
Domestic | Research credit      
Operating Loss Carryforwards [Line Items]      
Other tax carryforwards $ 29,600,000us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ us-gaap_TaxCreditCarryforwardAxis
= us-gaap_ResearchMember		    
Dutch      
Operating Loss Carryforwards [Line Items]      
Statutory federal rate (as a percent) 25.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
/ us-gaap_IncomeTaxAuthorityAxis
= country_NL