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Summary of Significant Accounting Policies - Segment Information (Details) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2018
Kansas Entertainment |  |
Segment Information |  |
Ownership interest in joint venture (as a percent) | 50.00% | 50.00%
Penn Interactive Ventures | Maximum |  |
Segment Information |  |
Percent of net revenue | 2.00% | 2.00%
Percent of income from operations | 2.00% | 2.00%
Percent of total assets | 2.00% | 2.00%

X
- Definition Percent of total assets at close of period. + References No definition available. + Details
Name: | penn_AssetsPercentOfTotalAssets
Namespace Prefix: | penn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the percentage of income from operations derived from the division. + References No definition available. + Details
Name: | penn_IncomeFromOperationsPercentage
Namespace Prefix: | penn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition The percent of total net revenues of the entity represented by the segment or subsegment. + References No definition available. + Details
Name: | penn_PercentOfNetRevenue
Namespace Prefix: | penn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=penn_PennInteractiveVenturesLlcMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |