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Current Fair Value of Debt (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt $ 292,144 $ 174,673
Debt, fair value 285,904  
Margin borrowing facilities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt 195,787 $ 174,673
Debt, fair value 195,787  
7.75% Subordinated Notes due 2045    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt [1] 96,357  
Debt, fair value [1] $ 90,117  
[1] As of September 30, 2015, the carrying value and fair value of the 7.75% Subordinated Notes due 2045 are net of unamortized debt issuance cost of $3.6 million.