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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.

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