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Subsequent Events - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Oct. 29, 2015 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Subsequent Event [Line Items] |  |  |  |  |
Net realized investment gain |  | $ (10,778,000) | $ 1,158,000 | $ (7,216,000) | $ 40,226,000
Fox Paine & Company, LLC | Redemption Agreement | Had the redemption occurred on or prior to September 30, 2015 |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Ordinary shares, shares outstanding |  | 17,472,318 |  | 17,472,318 |
Subsequent Events | Fox Paine & Company, LLC | Redemption Agreement |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Ordinary shares agreed to redeem, shares | 8,260,870 |  |  |  |
Ordinary shares agreed to redeem | $ 190,000,000 |  |  |  |
Proceeds from sale of securities | 279,900,000 |  |  |  |
Net realized investment gain | 1,600,000 |  |  |  |
Repayments under margin borrowing facilities | $ 102,000,000 |  |  |  |
Subsequent Events | Fox Paine & Company, LLC | Additional Redemption Agreement |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Ordinary shares agreed to redeem, shares | 3,376,561 |  |  |  |
Ordinary shares agreed to redeem | $ 77,660,903 |  |  |  |
Redemption agreement expiration date | Dec. 31, 2019 |  |  |  |
Subsequent Events | Fox Paine & Company, LLC | Redemption Agreement in Discussions |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Ordinary shares agreed to redeem, shares | 1,146,716 |  |  |  |

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