Acquisitions, Investments, Dispositions and Divestitures - Components of Assets and Liabilities Held for Sale (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Assets
Cash and cash equivalents		$ 13.4
Other current assets		2.1
Assets held for sale, current	5.1	15.5
Property and equipment, net		780.4
Goodwill		104.4
Intangible assets other than goodwill		292.7
Other long-term assets		0.2
Assets held for sale, non-current		1,177.7
Liabilities
Accounts payable and accrued expenses		13.5
Liabilities held for sale, current	3.8	13.5
Deferred credits and other		0.1
Deferred income taxes		66.2
Liabilities held for sale, non-current		66.3
Macau [Member]
Assets
Cash and cash equivalents	4.7	3.4
Other current assets	0.4	0.5
Assets held for sale, current	5.1	3.9
Property and equipment, net	471.2	584.3
Goodwill	0	0
Intangible assets other than goodwill	0	0
Other long-term assets	0	0
Assets held for sale, non-current	471.2	584.3
Liabilities
Accounts payable and accrued expenses	3.8	3.4
Liabilities held for sale, current	3.8	3.4
Deferred credits and other	0.2	0.1
Deferred income taxes	51.9	66.2
Liabilities held for sale, non-current	52.1	66.3
Harrahs St. Louis Casino [Member]
Assets
Cash and cash equivalents		10.0
Other current assets		1.6
Assets held for sale, current		11.6
Property and equipment, net		196.1
Goodwill		104.4
Intangible assets other than goodwill		292.7
Other long-term assets		0.2
Assets held for sale, non-current		593.4
Liabilities
Accounts payable and accrued expenses		10.1
Liabilities held for sale, current		10.1
Deferred credits and other		0
Deferred income taxes		0
Liabilities held for sale, non-current		$ 0