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Summary of Significant Accounting Policies (Details 6) | Mar. 31, 2015
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Kansas Entertainment |
Segment Information |
Ownership interest in joint venture (as a percent) | 50.00%
Cordish |
Segment Information |
Ownership interest in joint venture (as a percent) | 50.00%

X
- Definition Represents the entity's ownership interest in a joint venture. + References No definition available. + Details
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Namespace Prefix: | penn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis=penn_KansasEntertainmentLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis=penn_CordishMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |