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Summary of Significant Accounting Policies (Details 7) | 12 Months Ended
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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 | 2 penn_NumberOfFacilitiesThatWillFaceSignificantCompetition |  |
Number of facilities located in Charles Town, West Virginia that will face new significant competition in the near term | 1 penn_NumberOfFacilitiesInSpecifiedLocationOneThatWillFaceSignificantCompetition |  |
Number of facilities located in Grantville, Pennsylvania that will face new significant competition in the near term | 1 penn_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 |  |

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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the 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 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.D.2) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section D -Subsection 2 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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