Supplemental Cash Flow Information - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended		3 Months Ended	6 Months Ended	3 Months Ended		6 Months Ended		1 Months Ended		3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2012 Trademarks [Member]	Jun. 30, 2012 Trademarks [Member]	Jun. 30, 2013 Gaming Rights [Member]	Mar. 31, 2013 Gaming Rights [Member]	Jun. 30, 2013 Gaming Rights [Member]	Jun. 30, 2013 Discontinued Operations [Member]	Jun. 30, 2013 Mississippi [Member]	Mar. 31, 2012 Mississippi [Member]	Jun. 30, 2012 Macau [Member] Assets Held-for-sale [Member] Discontinued Operations [Member]	Jun. 30, 2013 Casino Reinvestment Development Authority (CRDA) [Member] Mississippi [Member]
Supplemental Cash Flow Information [Line Items]
Non-cash intangible asset impairments	$ 23.0		$ 33.0		$ 3.0	$ 20.0	$ 23.0					$ 101.7
Other Noncash Expense								42.5
Shares contributed by participating co-investors		1.8
Recorded impairment of tangible assets		$ 174.0		$ 33.0					$ 79.3	$ 167.5	$ 101.0