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Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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Maximum amount of loss due to credit risk that, based on the gross fair value of the financial instrument, the entity would incur if parties to the financial instruments that make up the concentration failed completely to perform according to the terms of the contracts and the collateral or other security, if any, for the amount due proved to be of no value to the entity.

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Amount of the cumulative effect on retained earnings net of related income tax effect.

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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)	3 Months Ended												12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Nov. 24, 2015
Property and Equipment
Impairment charge of assets being held and used													$ 0		$ 0
Investment in Unconsolidated Affiliates
Impairment charge													0	$ 0	0
Goodwill and Intangible Asset Impairment
Impairment charges related to goodwill														9,815,000	34,900,000
Impairment charges related to trade names															3,100,000
Impairment of goodwill and indefinite-lived intangible assets													0	0
Impairment charges													958,000	13,602,000	38,016,000
Impairment charges													0	0	0
Impairment of non operating real property													1,000,000.0	0	0
Disaggregation of Revenue
Net revenues	$ 592,124,000	$ 663,181,000	$ 637,121,000	$ 635,823,000	$ 671,760,000	$ 487,253,000	$ 456,802,000	$ 440,192,000	$ 429,901,000	$ 472,878,000	$ 375,626,000	$ 202,393,000	2,528,249,000	2,056,007,000	1,480,798,000
Advertising
Advertising Costs													28,900,000	33,900,000	33,000,000.0
ASC Topic 842
Advertising
Cumulative adjustment to retained earnings, net of tax													4,700,000
Complimentaries and Loyalty Point Redemptions
Disaggregation of Revenue
Net revenues													$ 291,900,000	210,800,000	$ 172,400,000
Maximum
Loyalty Program
Loyalty program liability redemption period													1 year
Silver Legacy Joint Venture
Investment in Unconsolidated Affiliates
Ownership interest	50.00%												50.00%			50.00%
Nemacolin \| Disposal Group, Held-for-sale, Not Discontinued Operations
Property and Equipment
Impairment charge of net assets being sold						$ 3,800,000								3,800,000
Churchill Downs Incorporated \| Vicksburg's
Goodwill and Intangible Asset Impairment
Impairment charges								$ 9,800,000					$ 9,800,000	9,800,000
Accounts Receivable
Accounts Receivable and Credit Risk
Concentration Risk, Credit Risk, Financial Instruments													$ 0	$ 0