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Related-Party Transactions - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended 3 Months Ended 4 Months Ended 5 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Jun. 30, 2010
Monsoon
Dec. 31, 2010
Monsoon
Aug. 31, 2011
Monsoon
Jul. 01, 2010
Monsoon
Dec. 31, 2011
Everest Gaming
Related Party Transaction [Line Items]              
Related party transactions, outstanding short-term indebtedness $ 1.7 $ 1.5          
Equity investment effective date 2010-07-01            
Loan to related party     $ 5.0 $ 5.1 $ 3.2 $ 10.3 $ 5.2
Loan to related party, interest rate     7.00% 7.00%     3.00%