Acquisitions, Investments, Dispositions and Divestitures - Income from Discontinued Operations (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net revenues	$ 14.3	$ 37.7	$ 47.7	$ 75.7
Pre-tax income/(loss) from operations	(26.4)	(7.5)	(113.1)	(54.9)
Income/(loss), net of income taxes	(26.4)	(5.0)	(113.1)	(48.7)
Harrahs Tunica [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net revenues	14.3	33.8	46.4	68.0
Pre-tax income/(loss) from operations	(25.6)	(7.1)	(96.4)	(9.6)
Income/(loss), net of income taxes	(25.6)	(4.6)	(96.4)	(6.2)
Golden Nugget Casino [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net revenues	0	3.1	1.3	5.2
Pre-tax income/(loss) from operations	(0.3)	(0.1)	(15.7)	(1.1)
Income/(loss), net of income taxes	(0.3)	(0.1)	(15.7)	(1.1)
Alea Leeds [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net revenues	0	0	0	0.7
Pre-tax income/(loss) from operations	(0.5)	(0.5)	(1.0)	(23.0)
Income/(loss), net of income taxes	(0.5)	(0.5)	(1.0)	(23.0)
Macau [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net revenues	0	0.8	0	1.8
Pre-tax income/(loss) from operations	0	0.2	0	(20.5)
Income/(loss), net of income taxes	0	0.2	0	(18.0)
Harrahs St. Louis [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net revenues	0	0	0	0
Pre-tax income/(loss) from operations	0	0	0	(0.7)
Income/(loss), net of income taxes	$ 0	$ 0	$ 0	$ (0.4)