Investments and Acquisition Activities (Details) (USD $)				12 Months Ended	3 Months Ended			3 Months Ended				3 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Aug. 12, 2013	Dec. 31, 2013 ACDL [Member]	Sep. 30, 2014 Farmworks	Dec. 31, 2013 Midwest [Member]	Dec. 31, 2013 Ameristar [Member]	Mar. 31, 2013 Retama Partners	Sep. 30, 2014 Retama Partners	Dec. 31, 2013 South Segment [Member]	Dec. 31, 2013 West [Member]	Sep. 30, 2013 Ameristar [Member]	Aug. 12, 2013 Ameristar [Member]
Schedule of Equity Method Investments
Equity Method Investment, Other than Temporary Impairment				$ 94,000,000
Business Acquisition Costs Excluding Assumption Of Long Term Debt													1,800,000,000
Business Acquisition Transaction, Consideration for Equity Acquired													962,428,000
Repayments of Debt												878,828,000
Current and other assets	260,496,000	602,178,000											152,165,000
Property, Plant and Equipment, Net	3,044,296,000	3,036,515,000											1,783,735,000
Goodwill	919,282,000	919,282,000				551,100,000	860,800,000			231,500,000	78,200,000		860,805,000
Intangible Assets	534,515,000	500,084,000											524,200,000
Other non-current assets	81,858,000	87,800,000											39,496,000
Total assets	4,848,114,000	5,159,426,000											3,360,401,000
Current liabilities	381,739,000	372,406,000											179,493,000
Deferred tax liabilities													218,646,000
Other long-term liabilities	40,107,000	31,321,000											8,109,000
Total liabilities	4,577,101,000	4,934,256,000											1,519,145,000
Business Acquisition, Net Assets Acquired													1,841,256,000
Land and land improvements	391,700,000	391,700,000											162,770,000
Buildings, vessels and improvements	2,649,800,000	2,492,200,000											1,308,151,000
Furniture, fixtures and equipment	693,500,000	633,100,000											158,999,000
Construction in Progress	118,500,000	175,600,000											153,815,000
Business Acquisition, Total Property and Equipment Acquired													1,783,735,000
Trade names													187,000,000
Gaming licenses													258,800,000
Player relationships													74,000,000
Favorable leasehold interests													4,400,000
Acquired Intangible Assets													524,200,000
Long Term Purchase Commitment, Invested Amount					2,000,000
Business Acquisition, Percentage of Voting Interests Acquired									75.50%
Goodwill, Acquired During Period								3,300,000
Intangible Asset, Acquired During Period								5,000,000
Business Acquisition, Goodwill, Expected Tax Deductible Amount			176,900,000
Promissory Notes	11,500,000	9,500,000
Held-to-maturity, Corporate Bonds	11,400,000
Long-term Debt	$ 3,993,300,000	$ 4,380,100,000											$ 1,112,897,000