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Investments in Equity Method Affiliates - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2012
Jun. 30, 2011
Dec. 31, 2010
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Schedule Of Investments In Equity Method Affiliates [Line Items]            
Incentive fee $ 4,301 $ 8,719 $ 12,308      
Company's share of incentive fee 1,720 4,359 6,154      
Earnings/(loss) realized       5,052 6,232 5,884
Deep Value GP [Member]
           
Schedule Of Investments In Equity Method Affiliates [Line Items]            
Company ownership percentage 50.00%   50.00% 50.00% 50.00% 50.00%
Earnings/(loss) realized         4,349 6,076
Deep Value GP II [Member]
           
Schedule Of Investments In Equity Method Affiliates [Line Items]            
Company ownership percentage 40.00%     40.00% 40.00%  
Earnings/(loss) realized       $ 1,726