Property and Equipment, net (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Abstract]
Land and land improvements	$ 6,273.3	$ 6,266.8
Buildings, riverboats, and improvements	6,610.0	6,668.1
Furniture, fixtures, and equipment	2,244.4	2,297.7
Construction in progress	1,099.4	824.6
Total, Gross	16,227.1	16,057.2
Less: accumulated depreciation	(2,879.2)	(2,819.3)
Property and equipment, net	$ 13,347.9	$ 13,237.9