Revenue Recognition - Summary of Net Revenues Disaggregated Type of Revenue and Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation Of Revenue [Line Items]
Net revenues	$ 635,823	$ 440,192
Casino
Disaggregation Of Revenue [Line Items]
Net revenues	466,878	339,458
Pari-mutuel Commissions
Disaggregation Of Revenue [Line Items]
Net revenues	3,973	4,070
Food and Beverage
Disaggregation Of Revenue [Line Items]
Net revenues	75,209	52,198
Hotel
Disaggregation Of Revenue [Line Items]
Net revenues	64,691	30,741
Other
Disaggregation Of Revenue [Line Items]
Net revenues	25,072	13,725
Corporate
Disaggregation Of Revenue [Line Items]
Net revenues	1,522	127
Corporate | Other
Disaggregation Of Revenue [Line Items]
Net revenues	1,522	127
West Segment | Operating Segment
Disaggregation Of Revenue [Line Items]
Net revenues	118,095	99,579
West Segment | Operating Segment | Casino
Disaggregation Of Revenue [Line Items]
Net revenues	53,571	49,734
West Segment | Operating Segment | Food and Beverage
Disaggregation Of Revenue [Line Items]
Net revenues	27,906	23,211
West Segment | Operating Segment | Hotel
Disaggregation Of Revenue [Line Items]
Net revenues	27,415	19,430
West Segment | Operating Segment | Other
Disaggregation Of Revenue [Line Items]
Net revenues	9,203	7,204
Midwest Segment | Operating Segment
Disaggregation Of Revenue [Line Items]
Net revenues	96,787	100,795
Midwest Segment | Operating Segment | Casino
Disaggregation Of Revenue [Line Items]
Net revenues	85,169	88,359
Midwest Segment | Operating Segment | Food and Beverage
Disaggregation Of Revenue [Line Items]
Net revenues	6,087	6,916
Midwest Segment | Operating Segment | Hotel
Disaggregation Of Revenue [Line Items]
Net revenues	3,622	3,637
Midwest Segment | Operating Segment | Other
Disaggregation Of Revenue [Line Items]
Net revenues	1,909	1,883
South Segment | Operating Segment
Disaggregation Of Revenue [Line Items]
Net revenues	132,714	122,800
South Segment | Operating Segment | Casino
Disaggregation Of Revenue [Line Items]
Net revenues	105,819	97,509
South Segment | Operating Segment | Pari-mutuel Commissions
Disaggregation Of Revenue [Line Items]
Net revenues	3,531	3,409
South Segment | Operating Segment | Food and Beverage
Disaggregation Of Revenue [Line Items]
Net revenues	14,709	13,860
South Segment | Operating Segment | Hotel
Disaggregation Of Revenue [Line Items]
Net revenues	6,337	5,992
South Segment | Operating Segment | Other
Disaggregation Of Revenue [Line Items]
Net revenues	2,318	2,030
East Segment | Operating Segment
Disaggregation Of Revenue [Line Items]
Net revenues	166,233	116,891
East Segment | Operating Segment | Casino
Disaggregation Of Revenue [Line Items]
Net revenues	124,509	103,856
East Segment | Operating Segment | Pari-mutuel Commissions
Disaggregation Of Revenue [Line Items]
Net revenues	442	661
East Segment | Operating Segment | Food and Beverage
Disaggregation Of Revenue [Line Items]
Net revenues	14,721	8,211
East Segment | Operating Segment | Hotel
Disaggregation Of Revenue [Line Items]
Net revenues	19,997	1,682
East Segment | Operating Segment | Other
Disaggregation Of Revenue [Line Items]
Net revenues	6,564	$ 2,481
Central Segment | Operating Segment
Disaggregation Of Revenue [Line Items]
Net revenues	120,472
Central Segment | Operating Segment | Casino
Disaggregation Of Revenue [Line Items]
Net revenues	97,810
Central Segment | Operating Segment | Food and Beverage
Disaggregation Of Revenue [Line Items]
Net revenues	11,786
Central Segment | Operating Segment | Hotel
Disaggregation Of Revenue [Line Items]
Net revenues	7,320
Central Segment | Operating Segment | Other
Disaggregation Of Revenue [Line Items]
Net revenues	$ 3,556