Property and Equipment, net (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Property, Plant and Equipment [Abstract]
Land and land improvements	$ 6,810.3	$ 7,208.8
Buildings, riverboats, and improvements	8,102.9	8,725.7
Furniture, fixtures, and equipment	2,530.7	2,491.0
Construction in progress	694.8	378.3
Total, Gross	18,138.7	18,803.8
Less: accumulated depreciation	(3,222.3)	(3,102.1)
Property and equipment, net	$ 14,916.4	$ 15,701.7