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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, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Fair Value Assets And Liabilities Measured On Unobservable Inputs [Line Items]        
Change in fair value of financial instruments, Liabilities $ (3,358)   $ (2,198)  
Change in fair value of financial instruments 3,093 $ (1,592) 1,940 $ (5,680)
Junior subordinated notes        
Fair Value Assets And Liabilities Measured On Unobservable Inputs [Line Items]        
Change in fair value of financial instruments, Liabilities (42) (1,004) (702) (285)
Derivative        
Fair Value Assets And Liabilities Measured On Unobservable Inputs [Line Items]        
Change in fair value of financial instruments, Liabilities (265) (388) (258) (2,295)
Warrants and investor SARs        
Fair Value Assets And Liabilities Measured On Unobservable Inputs [Line Items]        
Change in fair value of financial instruments, Liabilities (3,400)   (2,900)  
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 $ 3,400 $ (200) $ 2,900 $ (3,100)