Supplemental Cash Flow Information - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended		12 Months Ended
	Feb. 29, 2012	Jan. 31, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Foreign currency translation adjustments			$ 18.8
Capital lease obligations incurred			35.8
Share-based Compensation			55.1	22.2	18.1
Non-cash write-downs and reserves, net of recoveries			41.4	5.3	108.1
Number Of Shares Agreed To Be Contributed By Participating Co Investors	1.8	1.8
Effect of change in accounting for accruals for casino jackpot liabilities, net of tax				10.7
Interest capitalized			38.2	22.8	1.4
Federal income tax refund received			0	0	220.8
Thistledown Racetrack [Member]
Deconsolidation of subsidiary			$ 42.9