Segment Information - Additional Information (Details) slot_machine in Thousands	6 Months Ended
Jun. 30, 2021 segment slot_machine game sportsbook state	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Number of operating segments \| segment	3
Number of slot machines \| slot_machine	11
Number of table games \| game	200
Number of states in which Gaming segment has slot machines and video lottery terminals \| state	8
TwinSpires
Schedule of Equity Method Investments [Line Items]
Number of sportsbooks \| sportsbook	6
Rivers Des Plaines
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	61.30%	61.30%
Miami Valley Gaming LLC
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	50.00%	50.00%

Number Of Slot Machines

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- Definition

Number Of Sportsbooks

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Number of table games

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
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-Paragraph 3
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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8672-108599

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The number of states the entity operates in as of the balance sheet date.

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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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