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Acquisitions, Investments and Dispositions - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
1 Months Ended 3 Months Ended 9 Months Ended 1 Months Ended 1 Months Ended
Aug. 31, 2012
May 31, 2012
Sep. 30, 2012
Sep. 30, 2012
Jan. 31, 2012
Chester Downs and Marina, LLC [Member]
Feb. 14, 2012
Chester Downs and Marina, LLC [Member]
Jun. 30, 2012
Windsor Casino Limited [Member]
Jan. 31, 2012
Windsor Casino Limited [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]                
Percentage of minority ownership acquired         90.00%      
Consideration for purchase of minority interest         $ 9.6      
Total ownership interest property     52.00% 52.00%   99.50% 100.00%  
Percentage of minority ownership acquired               50.00%
Payment for third party equity redemption             8.7  
Sales price of Harrah's St. Louis   610.0            
Percentage of majority interest sold 53.39%              
Cash received from sale of equity interest in associated companies 28.6              
Contribution of remaining equity interest for exchange 46.61%              
Gain on exchange for additional equity interest 11.0   11.0 11.0        
Purchased equity interest $ 14.3              
Percentage of equity interest retain 80.00%