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Investments in Equity Method Affiliates - Schedule of Investment in Equity Method Affiliates (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Schedule Of Investments In Equity Method Affiliates [Line Items]      
Beginning Balance $ 6,076 $ 2,106 $ 477
Investments / advances 4,716 5,031 5,783
Distributions / repayments (12,093) (7,293) (9,983)
In-kind distribution     (55)
Earnings / (loss) realized 5,052 6,232 5,884
Ending Balance 1,910 6,076 2,106
Reorganization (1,841)    
Star Asia Manager [Member]
      
Schedule Of Investments In Equity Method Affiliates [Line Items]      
Beginning Balance 1,046 202 343
Investments / advances         
Distributions / repayments (1,600) (850) (975)
In-kind distribution       
Earnings / (loss) realized 1,101 1,694 834
Ending Balance 547 1,046 202
Reorganization       
Deep Value GP [Member]
      
Schedule Of Investments In Equity Method Affiliates [Line Items]      
Beginning Balance 21 269 97
Investments / advances         
Distributions / repayments   (4,597) (5,904)
In-kind distribution       
Earnings / (loss) realized (14) 4,349 6,076
Ending Balance 7 21 269
Reorganization       
Deep Value GP II [Member]
      
Schedule Of Investments In Equity Method Affiliates [Line Items]      
Beginning Balance 33 31 37
Investments / advances         
Distributions / repayments (1,720)      
In-kind distribution       
Earnings / (loss) realized 1,726 2 (6)
Ending Balance 39 33 31
Reorganization       
Star Asia SPV [Member]
      
Schedule Of Investments In Equity Method Affiliates [Line Items]      
Beginning Balance 466 1,604  
Investments / advances 10 6 4,500
Distributions / repayments (662) (1,846) (3,104)
In-kind distribution     (55)
Earnings / (loss) realized 1,581 702 263
Ending Balance 1,395 466 1,604
Reorganization       
Star Asia Opportunity [Member]
      
Schedule Of Investments In Equity Method Affiliates [Line Items]      
Beginning Balance 4,460      
Investments / advances    4,055   
Distributions / repayments (4,982)      
In-kind distribution       
Earnings / (loss) realized 544 405   
Ending Balance 22 4,460   
Reorganization       
Star Asia Capital Management [Member]
      
Schedule Of Investments In Equity Method Affiliates [Line Items]      
Beginning Balance 50      
Investments / advances 6 6   
Distributions / repayments (652)      
In-kind distribution       
Earnings / (loss) realized 504 44   
Ending Balance (92) 50   
Reorganization       
Star Asia Opportunity II [Member]
      
Schedule Of Investments In Equity Method Affiliates [Line Items]      
Beginning Balance         
Investments / advances 4,700      
Distributions / repayments (2,477)      
In-kind distribution       
Earnings / (loss) realized (382)      
Ending Balance         
Reorganization (1,841)    
SAA Manager [Member]
      
Schedule Of Investments In Equity Method Affiliates [Line Items]      
Beginning Balance         
Investments / advances         
Distributions / repayments         
In-kind distribution       
Earnings / (loss) realized (8)      
Ending Balance (8)      
Reorganization       
Duart Capital and Other [Member]
      
Schedule Of Investments In Equity Method Affiliates [Line Items]      
Beginning Balance         
Investments / advances    964 1,283
Distributions / repayments         
In-kind distribution       
Earnings / (loss) realized    (964) (1,283)
Ending Balance         
Reorganization