Operating Leases - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2002
Leases [Abstract]
Rent expense for contingent lease payments	$ 3,600,000	$ 3,400,000	$ 3,500,000
Total rent expense for all operating leases	$ 18,300,000	$ 18,900,000	$ 19,700,000
Payment to re-acquire Churchill Downs facility in future period				$ 1.00