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

- References

No definition available.

+ Details

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