Summary of Significant Accounting Policies (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	1 Months Ended	3 Months Ended	12 Months Ended						12 Months Ended					12 Months Ended
	Jul. 31, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Retama Partners	Jan. 31, 2011 Belterra Park [Member]	Dec. 31, 2012 Heartland Poker Tour	Dec. 31, 2013 Allowance for Doubtful Accounts	Dec. 31, 2012 Allowance for Doubtful Accounts	Dec. 31, 2011 Allowance for Doubtful Accounts	Dec. 31, 2013 Ameristar	Aug. 12, 2013 Ameristar	Dec. 31, 2013 Ameristar Lake Charles [Domain]	Dec. 31, 2013 Boomtown Bossier City [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount			1.7	0.5
Impairment of indefinite-lived intangible			$ 10,000,000	$ 0	$ 0										$ 10,000,000
Goodwill, Acquired During Period			864,100,000			3,300,000
Indefinite-lived Intangible Assets Acquired			529,200,000			5,000,000
intangible assets-gaming license														29,800,000
Business Acquisition, Purchase Pruce Allocation, Goodwill							35,800,000	2,600,000
Basis of Presentation and Organization
Cost of Acquired Entity, Per Share												$ 26.50
Cost of Acquired Entity												2,800,000,000	962,428,000
Balance Sheet Related Disclosures
Cash and cash equivalents			191,938,000	94,800,000
Allowance for doubtful accounts			5,178,000	7,308,000
Bad debt expense									2,190,000	3,766,000	2,932,000
Restricted cash			11,592,000	5,667,000
Business Acquisition, Contratual rights						50.00%
Accrued Liabilities
Self insurance accruals			26,200,000	13,700,000
Customer Loyalty Program Liability			18,900,000	10,600,000
Stock Repurchase Program, Authorized Amount	100,000,000
Treasury Stock, Shares, Acquired				4.4
Payments for Repurchase of Common Stock		51,000,000	0	51,000,000	0
Proceeds from Divestiture of Businesses														180,000,000
Proceeds from divestiture of business, deferred consideration														$ 35,000,000