Summary of Significant Accounting Policies - Segment Information and Certain Risks and Uncertainties (Details)	12 Months Ended
Dec. 31, 2016 segment
Segment Information
Number of reportable segments	3
Hollywood Casino at Charles Town Races \| Minimum
Certain Risks and Uncertainties
Percent of net revenue	10.00%
Kansas Entertainment
Segment Information
Ownership interest in joint venture (as a percent)	50.00%
Penn Interactive Ventures
Segment Information
Percentage of net revenues	0.80%
Percentage of income from operations	0.40%

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Represents the percentage of income from operations derived from the division.

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The percent of total net revenues of the entity represented by the segment or subsegment.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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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.

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