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Debt - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Aug. 12, 2015
Dec. 31, 2014
Debt Instrument [Line Items]            
Debt $ 292,144   $ 292,144     $ 174,673
Interest expense 1,595 $ 118 $ 2,635 $ 628    
Debt instrument, interest rate terms     100.00%      
Margin borrowing facilities            
Debt Instrument [Line Items]            
Debt $ 195,787   $ 195,787     $ 174,673
Stated interest rate 1.00%   1.00%      
Collateral deposited to support borrowing $ 248,500   $ 248,500      
Interest expense 500 $ 100 1,600 $ 500    
7.75% Subordinated Notes due 2045            
Debt Instrument [Line Items]            
Debt [1] $ 96,357   $ 96,357      
Stated interest rate 7.75%   7.75%     7.75%
Interest expense $ 1,100   $ 1,100      
Debt instrument, face amount         $ 100,000  
Debt instrument, interest rate terms     Payable quarterly in arrears on February 15, May 15, August 15, and November 15 of each year      
Debt instrument, maturity date     Aug. 15, 2045      
Debt instrument, redemption description     The Company has the right to redeem the notes in $25 increments, in whole or in part, on and after August 15, 2020, or on any interest payments date thereafter, at a redemption price equal to 100% of the principal amount of the notes being redeemed plus accrued and unpaid interest to, but not including, the date of redemption.      
Deferred issuance costs $ 3,600   $ 3,600      
[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.