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Financial Instruments - Changes in Level 3 Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Investments [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Beginning Balance     $ 12,482 [1] $ 17,208 [1]
Realized Gains (Losses)     (9) [1],[2]  
Unrealized Gains (Losses)     405 [1],[2] (794) [1],[3]
Purchases, Issuances     358 [1] 572 [1]
Sales, Settlements     (442) [1] (1,500) [1]
Transfers In/ Out     11 [1] (13) [1]
Ending Balance 12,805 [1] 15,473 [1] 12,805 [1] 15,473 [1]
Other [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Beginning Balance     50 [4]  
Purchases & Issuances   1,502 [4] (50) [4] 1,502 [4]
Transfers In/ Out    [4]    [4]    [4]    [4]
Ending Balance   1,502 [4]   1,502 [4]
Derivative [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Beginning Balance 2,334   2,347  
Unrealized Gains (Losses) (81) [3]   (94) [3]  
Transfers In/ Out            
Ending Balance 2,253   2,253  
Mortgage Backed Securities, Other [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Beginning Balance     16 [5] 14 [5]
Realized Gains (Losses)     (8) [2],[5] 1 [3],[5]
Unrealized Gains (Losses)     5 [2],[5] 0 [3],[5]
Purchases, Issuances     95 [5] 995 [5]
Sales, Settlements     (80) [5] (244) [5]
Transfers In/ Out     (2) [5] 0 [5]
Ending Balance 26 [5] 766 [5] 26 [5] 766 [5]
Beginning Balance   11 [5]    
Realized Gains (Losses)       0 [3],[5]
Purchases & Issuances   (11) [5]   11 [5]
Sales & Settlements       (11) [5]
Transfers In/ Out    [5]    [5]    [5]    [5]
Municipal obligations [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Beginning Balance     3,562 1,787
Realized Gains (Losses)     (5) [2] (12) [3]
Unrealized Gains (Losses)     (505) [2] (334) [3]
Purchases, Issuances     9,960 2,982
Sales, Settlements     (2,340) (294)
Ending Balance 10,672 4,129 10,672 4,129
Other [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Beginning Balance     65,001 [4] 35,909 [4]
Unrealized Gains (Losses)     (351) [2],[4] (393) [3],[4]
Purchases, Issuances     20,675 [4] 38,178 [4]
Sales, Settlements     (18,946) [4] (8,475) [4]
Ending Balance 66,379 [4] 65,219 [4] 66,379 [4] 65,219 [4]
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Investments [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Beginning Balance 12,760 [1] 16,141 [1]    
Realized Gains (Losses) (9) [1],[3]      
Unrealized Gains (Losses) (32) [1],[3] (793) [1],[3]    
Purchases, Issuances 231 [1] 126 [1]    
Sales, Settlements (145) [1]      
Transfers In/ Out   (1) [1]    
Ending Balance 12,805 [1] 15,473 [1] 12,805 [1] 15,473 [1]
Fair Value, Measurements, Recurring [Member] | Mortgage Backed Securities, Other [Member] | Level 3 [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Beginning Balance 12 [5] 105 [5]    
Realized Gains (Losses)   1 [3],[5]    
Unrealized Gains (Losses) 3 [3],[5] (3) [3],[5]    
Purchases, Issuances 11 [5] 893 [5]    
Sales, Settlements   (230) [5]    
Transfers In/ Out   0 [5]    
Ending Balance 26 [5] 766 [5] 26 [5] 766 [5]
Fair Value, Measurements, Recurring [Member] | Municipal obligations [Member] | Level 3 [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Beginning Balance 10,120 3,829    
Realized Gains (Losses)   (12) [3]    
Unrealized Gains (Losses) (13) [3] (143) [3]    
Purchases, Issuances 655 575    
Sales, Settlements (90) (119)    
Ending Balance 10,672 4,129 10,672 4,129
Fair Value, Measurements, Recurring [Member] | Other [Member] | Level 3 [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Beginning Balance 64,644 [4] 63,098 [4]    
Unrealized Gains (Losses) 410 [3],[4] 543 [3],[4]    
Purchases, Issuances 5,950 [4] 4,028 [4]    
Sales, Settlements (4,625) [4] (2,450) [4]    
Ending Balance $ 66,379 [4] $ 65,219 [4] $ 66,379 [4] $ 65,219 [4]
[1] Primarily represents general partner ownership interests in hedge funds and private equity funds sponsored by the Company.
[2] Included in principal transactions on the consolidated statement of operations, except for investments which are included in other income on the consolidated statement of operations
[3] Included in principal transactions on the consolidated statement of operations, except for investments which are included in other income on the condensed consolidated statement of operations.
[4] Represents auction rate securities that failed in the auction rate market.
[5] Represents private placements of non-agency collateralized mortgage obligations.