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Realized and Unrealized Gains and Losses on Assets and Liabilities (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Fair Value Assets And Liabilities Measured On Unobservable Inputs [Line Items]        
Change in fair value of financial instruments, Liabilities $ (13,439)      
Change in fair value of financial instruments 8,356 $ (25,071) $ 12,846 $ (49,210)
Warrants and investor SARs        
Fair Value Assets And Liabilities Measured On Unobservable Inputs [Line Items]        
Change in fair value of financial instruments, Liabilities (13,203)      
Fair Value, Measurements, Recurring | Warrants and investor SARs        
Fair Value Assets And Liabilities Measured On Unobservable Inputs [Line Items]        
Change in fair value of financial instruments, Liabilities 6,413 (782) 13,203 3,260
Trading securities and security-related receivables        
Fair Value Assets And Liabilities Measured On Unobservable Inputs [Line Items]        
Change in fair value of financial instruments, Assets   2,132 (173) 8,574
Collateralized Debt Obligations Notes Payable and Trust Preferred Obligations        
Fair Value Assets And Liabilities Measured On Unobservable Inputs [Line Items]        
Change in fair value of financial instruments, Liabilities 316 (18,937) 236 (49,333)
Derivative        
Fair Value Assets And Liabilities Measured On Unobservable Inputs [Line Items]        
Change in fair value of financial instruments, Liabilities $ 1,627 $ (7,484) $ (420) $ (11,711)