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Income Taxes (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets:    
Stock-based compensation expense $ 44,607,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost $ 51,045,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Accrued expenses 57,785,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities 57,387,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
Intangibles 142,591,000us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets 43,204,000us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets
Deferred tax assets resulting from unrecognized tax benefits 11,365,000penn_DeferredTaxAssetsUnrecognizedTaxBenefits 10,817,000penn_DeferredTaxAssetsUnrecognizedTaxBenefits
Net operating losses 11,941,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal 4,690,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal
Accumulated other comprehensive loss 592,000us-gaap_DeferredTaxAssetsOtherComprehensiveLoss 1,863,000us-gaap_DeferredTaxAssetsOtherComprehensiveLoss
Gross deferred tax assets 268,881,000us-gaap_DeferredTaxAssetsGross 169,006,000us-gaap_DeferredTaxAssetsGross
Less valuation allowance (6,851,000)us-gaap_DeferredTaxAssetsValuationAllowance (3,664,000)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax assets 262,030,000us-gaap_DeferredTaxAssetsNet 165,342,000us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities:    
Property, plant and equipment (123,108,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (102,379,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Investments in unconsolidated affiliates (4,276,000)us-gaap_DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates (5,782,000)us-gaap_DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates
Net deferred tax liabilities (127,384,000)us-gaap_DeferredTaxLiabilities (108,161,000)us-gaap_DeferredTaxLiabilities
Net: 134,646,000us-gaap_DeferredTaxAssetsLiabilitiesNet 57,181,000us-gaap_DeferredTaxAssetsLiabilitiesNet
Reflected on consolidated balance sheets:    
Current deferred tax assets, net 55,579,000us-gaap_DeferredTaxAssetsNetCurrent 71,093,000us-gaap_DeferredTaxAssetsNetCurrent
Noncurrent deferred tax assets (liabilities), net 79,067,000us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent (13,912,000)us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent
Net: 134,646,000us-gaap_DeferredTaxAssetsLiabilitiesNet 57,181,000us-gaap_DeferredTaxAssetsLiabilitiesNet
Operating loss carryforwards    
Tax benefit associated with net operating loss carryforwards 11,941,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal 4,690,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal
Tax Credit Carryforward, Valuation Allowance 2,400,000us-gaap_TaxCreditCarryforwardValuationAllowance  
Increased of valuation allowance 3,200,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount  
State and Local    
Deferred tax assets:    
Net operating losses 9,600,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		  
Operating loss carryforwards    
Net operating loss carryforwards 184,600,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		  
Tax benefit associated with net operating loss carryforwards 9,600,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		  
Valuation allowance recorded to reflect the net operating losses which are not presently expected to be realized 4,500,000us-gaap_OperatingLossCarryforwardsValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		  
State and Local | Subsidiaries    
Operating loss carryforwards    
Gross state net operating loss carryforwards for which no benefit has been recorded as they are attributable to uncertain tax positions 916,600,000penn_OperatingLossCarryforwardsAttributableToUncertainTaxPositions
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		  
Unrecognized tax benefits attributable to the net operating losses 55,700,000penn_UnrecognizedTaxBenefitsResultingInNetOperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		  
Increase to equity in the event of any benefit from realization of net operating losses $ 11,500,000penn_IncreaseToEquityInEventOfBenefitFromRealizationOfNetOperatingLosses
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember