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Acquisitions, Investments, Dispositions and Divestitures - Additional Information (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
Dec. 31, 2013
Acquisitions and Investments [Abstract]          
Impairment of intangible and tangible assets $ 32.9 $ 104.7 $ 65.8 $ 124.7  
Net revenues 2,185.5 2,121.3 4,254.7 4,228.0  
Income/(loss) from operations 106.3 132.4 248.3 277.6  
Proceeds received from sale of assets     27.9 0  
Assets held for sale 6.7   6.7   11.9
Harrahs Tunica [Member]
         
Acquisitions and Investments [Abstract]          
Impairment of intangible and tangible assets     68.0    
Business Exit Costs     10.9    
Showboat Atlantic City [Member]
         
Acquisitions and Investments [Abstract]          
Business Exit Costs     4.8    
Golden Nugget Casino [Member]
         
Acquisitions and Investments [Abstract]          
Impairment of intangible and tangible assets     1.7    
Business Exit Costs     13.1    
Claridge Hotel Tower, Atlantic City [Member]
         
Acquisitions and Investments [Abstract]          
Proceeds received from sale of assets     12.5    
Assets held for sale         11.9
Council Bluffs, Iowa [Member]
         
Acquisitions and Investments [Abstract]          
Business Exit Costs     65.0    
Business Exit Costs Fair Value $ 40.3 $ 0 $ 40.3 $ 0