Property and Equipment, net (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Property, Plant and Equipment [Abstract]
Land and land improvements	$ 6,231.3	$ 6,266.8
Buildings, riverboats, and improvements	7,574.1	6,668.1
Furniture, fixtures, and equipment	2,558.7	2,297.7
Construction in progress	251.1	824.6
Total, Gross	16,615.2	16,057.2
Less: accumulated depreciation	(3,130.4)	(2,819.3)
Property and equipment, net	$ 13,484.8	$ 13,237.9