Goodwill and Other Intangible Assets - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Intangible Assets Excluding Goodwill [Line Items]
Goodwill acquired									$ 14.3	$ 50.7
Impairment of non-amortizing intangible assets other than goodwill	50.0	159.0							242.0	8.0
Goodwill impairment loss	8.2	247.0							195.2	3.0	92.0
Goodwill impairment reversal	(60.0)
Contribution of Thistledown to joint venture, Goodwill adjustment									(20.1)	0
Amortizing Intangible Assets, Additions or adjustments										85.4
Impairment of intangible and tangible assets	448.2	419.0	33.0	167.5	5.7	27.1	0	0	1,067.7	32.8	184.0
Amortization of Intangible Assets									174.6	156.7	160.8
Estimated amortization expense, 2013	163.9								163.9
Estimated amortization expense, 2014	151.9								151.9
Estimated amortization expense, 2015	150.3								150.3
Estimated amortization expense, 2016	135.4								135.4
Estimated amortization expense, 2017	126.0								126.0
Gaming rights [Member]
Intangible Assets Excluding Goodwill [Line Items]
Impairment of non-amortizing intangible assets other than goodwill	1.0	32.0							33.0
Trademark [Member]
Intangible Assets Excluding Goodwill [Line Items]
Impairment of non-amortizing intangible assets other than goodwill	49.0	127.0							209.0
Thistledown Racetrack [Member]
Intangible Assets Excluding Goodwill [Line Items]
Contribution of Thistledown to joint venture, Goodwill adjustment									20.1
Bubbler Media [Member]
Intangible Assets Excluding Goodwill [Line Items]
Goodwill acquired									7.5
Buffalo Studios, LLC [Member]
Intangible Assets Excluding Goodwill [Line Items]
Goodwill acquired									6.8
Amortizing Intangible Assets, Additions or adjustments									37.8
Playtika LTD [Member]
Intangible Assets Excluding Goodwill [Line Items]
Goodwill acquired										$ 50.7