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Summary of Significant Accounting Policies (Details 7)
 12 Months Ended
Dec. 31, 2014
facility
Dec. 31, 2013
Dec. 31, 2012
Stock-based compensation costs      
Time period of historical volatility of stock used to estimate expected volatility 5 years 5 months 12 days    
Expected dividend yield assumption (as a percent) 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate    
Weighted-average assumptions used in the Black-Scholes option-pricing model      
Risk-free interest rate (as a percent) 1.68%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate 1.08%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate 0.84%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
Expected volatility (as a percent) 44.80%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate 46.27%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate 45.78%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
Weighted-average expected life 5 years 5 months 12 days 6 years 6 months 26 days 6 years 7 months 21 days
Certain Risks and Uncertainties      
Number of facilities in terms of net revenues that will face new significant competition in the near term 2penn_NumberOfFacilitiesThatWillFaceSignificantCompetition    
Number of facilities located in Charles Town, West Virginia that will face new significant competition in the near term 1penn_NumberOfFacilitiesInSpecifiedLocationOneThatWillFaceSignificantCompetition    
Number of facilities located in Grantville, Pennsylvania that will face new significant competition in the near term 1penn_NumberOfFacilitiesInSpecifiedLocationTwoThatWillFaceSignificantCompetition    
Kansas      
Segment Information      
Ownership interest in joint venture (as a percent) 50.00%penn_JointVentureOwnershipInterestPercentage
/ us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis
= penn_KansasEntertainmentLLCMember		    
Cordish      
Segment Information      
Ownership interest in joint venture (as a percent) 50.00%penn_JointVentureOwnershipInterestPercentage
/ us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis
= penn_CordishMember