Acquisitions, Investments, Dispositions and Divestitures - Income from Discontinued Operations (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net revenues	$ 1.7	$ 65.8
Pre-tax (loss)/income from operations	(43.8)	14.2
(Loss)/income, net of income taxes	(41.0)	7.3
Harrahs St. Louis [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net revenues	0	63.5
Pre-tax (loss)/income from operations	(0.7)	19.1
(Loss)/income, net of income taxes	(0.4)	11.6
Macau [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net revenues	1.0	0.9
Pre-tax (loss)/income from operations	(20.7)	(3.7)
(Loss)/income, net of income taxes	(18.2)	(3.1)
Alea Leeds [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net revenues	0.7	1.4
Pre-tax (loss)/income from operations	(22.4)	(1.2)
(Loss)/income, net of income taxes	$ (22.4)	$ (1.2)