Property and Equipment - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property Plant And Equipment [Line Items]
Depreciation, depletion and amortization, nonproduction	$ 63,449,000	$ 56,921,000	$ 28,643,000
Depreciation expense including amortization expense on capital leases		51,000,000	26,900,000
Capital expenditure reimbursed by West Virginia Racing Commission	4,207,000	1,266,000	$ 799,000
Mountaineer
Property Plant And Equipment [Line Items]
Capital expenditure reimbursed by West Virginia Racing Commission	700,000
Amount of qualified capital expenditure reimbursed by West Virginia Lottery Commission	1
Amount of qualified capital expenditure submitted for reimbursement by West Virginia Lottery Commission	2
Qualified capital expenditure reimbursed	3,500,000
Modernization fund grants eligibility fund	3,400,000
Assets Acquired Under Capital Lease
Property Plant And Equipment [Line Items]
Accumulated, depreciation and amortization	2,900,000	$ 3,300,000
Capital Leases
Property Plant And Equipment [Line Items]
Depreciation, depletion and amortization, nonproduction	$ 58,900,000