Segment Information (Details) (USD $)	3 Months Ended										12 Months Ended
	Dec. 31, 2013		Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012		Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Revenues:
Revenues	$ 535,000,000		$ 418,900,000	$ 267,300,000	$ 266,600,000	$ 254,800,000		$ 256,200,000	$ 248,500,000	$ 243,400,000	$ 1,487,836,000		$ 1,002,836,000		$ 940,874,000
Adjusted EBITDA [Abstract]
Adjusted EBITDA											370,600,000	[1]	250,300,000	[1]	216,000,000	[1]
Other benefits (costs) [Abstract]
Depreciation and amortization											(148,456,000)		(82,689,000)		(70,205,000)
Pre-opening and development costs											(89,009,000)		(21,508,000)		(8,817,000)
Share-based Compensation Expense											(11,500,000)		(8,500,000)		(6,500,000)
Write-downs, reserves and recoveries, net											(17,265,000)		(829,000)		(3,167,000)
Net interest expense, net of capitalized interest											(169,812,000)		(93,670,000)		(95,308,000)
Loss from equity method investment											(92,181,000)		(30,780,000)		(588,000)
Loss on early extinguishment of debt											(30,830,000)		(20,718,000)		(183,000)
Income tax (expense) benefit											55,055,000		(4,764,000)		(2,284,000)
Income (loss) from continuing operations	8,600,000		(47,100,000)	(7,100,000)	(87,800,000)	(31,100,000)		6,700,000	13,200,000	(2,000,000)	(133,381,000)		(13,237,000)		28,903,000
Capital expenditures											292,623,000		299,464,000		153,452,000
Assets	5,159,426,000					2,108,994,000					5,159,426,000		2,108,994,000
Midwest Segment [Domain]
Revenues:
Revenues											650,900,000	[2]	367,300,000	[2]	346,700,000	[2]
Adjusted EBITDA [Abstract]
Adjusted EBITDA											183,700,000	[1],[2]	94,300,000	[1],[2]	76,700,000	[1],[2]
Other benefits (costs) [Abstract]
Capital expenditures											139,400,000		37,100,000		7,800,000
Assets	2,310,700,000					542,800,000					2,310,700,000		542,800,000
South Segment [Domain]
Revenues:
Revenues											748,100,000		634,900,000		594,000,000
Adjusted EBITDA [Abstract]
Adjusted EBITDA											213,500,000	[1]	176,600,000	[1]	167,700,000	[1]
Other benefits (costs) [Abstract]
Capital expenditures											77,800,000		249,000,000		124,600,000
Assets	1,363,600,000					882,200,000					1,363,600,000		882,200,000
West [Member]
Revenues:
Revenues											82,900,000		0		0
Adjusted EBITDA [Abstract]
Adjusted EBITDA											27,700,000	[1]	0	[1]	0	[1]
Other benefits (costs) [Abstract]
Capital expenditures											1,700,000		0		0
Assets	436,000,000	[2]				0	[2]				436,000,000	[2]	0	[2]
Operating Segments [Member]
Revenues:
Revenues											1,481,900,000		1,002,200,000		940,700,000
Adjusted EBITDA [Abstract]
Adjusted EBITDA											424,900,000		270,900,000		244,400,000
Corporate and Other
Revenues:
Revenues											6,000,000		600,000		100,000
Adjusted EBITDA [Abstract]
Adjusted EBITDA											(54,300,000)	[1]	(20,600,000)	[1]	(28,400,000)	[1]
Other benefits (costs) [Abstract]
Capital expenditures											73,700,000		13,400,000		21,100,000
Assets	$ 1,049,100,000					$ 684,000,000					$ 1,049,100,000		$ 684,000,000

[1] (b) Our South segment consists of Ameristar Vicksburg located in Mississippi, Boomtown Bossier City located in Louisiana, Boomtown New Orleans located in Louisiana, L'Auberge Baton Rouge located in Louisiana and L'Auberge Lake Charles located in Louisiana.

[2] (a) Our Midwest segment consists of Ameristar Council Bluffs located in Iowa, Ameristar East Chicago located in Indiana, Ameristar Kansas City located in Missouri, Ameristar St. Charles located in Missouri, Belterra located in Indiana, Belterra Park (formerly River Downs) located in Ohio and River City located in Missouri.