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Business and Basis of Presentation (Details) | 12 Months Ended
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Dec. 31, 2014 item facility jurisdiction
Business and Basis of Presentation |
Number of facilities the entity owned, managed, or had ownership interests in | 26 penn_NumberOfFacilities
Number of jurisdictions in which the entity operates | 17 penn_NumberOfJurisdictionsInWhichEntityOperates
Number of new gaming properties | 4 penn_NumberOfGamingProperties
Period for opening new gaming properties | 3 years

X
- Definition The number of facilities which the entity owns, manages or has an ownership interest in as of the balance sheet date. + References No definition available. + Details
Name: | penn_NumberOfFacilities
Namespace Prefix: | penn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the number of new gaming properties . + References No definition available. + Details
Name: | penn_NumberOfGamingProperties
Namespace Prefix: | penn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of jurisdictions the entity operates in as of the balance sheet date. + References No definition available. + Details
Name: | penn_NumberOfJurisdictionsInWhichEntityOperates
Namespace Prefix: | penn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the period over which new gaming properties have opened. + References No definition available. + Details
Name: | penn_PeriodOfFourGamingPropertiesOpened
Namespace Prefix: | penn_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration