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Stockholders' Equity - Additional Information (Detail) - USD ($) |  | 1 Months Ended | 3 Months Ended | 7 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Apr. 28, 2016 | Apr. 30, 2016 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  |  |  |  |  |  |  | $ 10,000,000 |  |
Treasury shares acquired |  |  |  |  |  |  | 98,929 |  |  |
Shares repurchased during period |  |  |  |  |  |  | $ 2,100,000 | 8,510,000 | $ 18,649,000 | $ 29,736,000
Stock Repurchase Program Expiration Date |  |  |  |  |  |  | Dec. 31, 2017 |  |  |
Received distributions from the earnings of subsidiaries |  |  |  |  |  |  |  | 46,900,000 | 58,200,000 | 55,800,000
Capital contributions to subsidiaries |  |  |  |  |  |  |  |  | 0 | $ 0
APPCIC [Member] |  |  |  |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Capital contributions to subsidiaries |  |  |  |  |  |  |  | $ 2,000,000 |  |
Open Market [Member] |  |  |  |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Treasury shares acquired |  |  |  |  |  |  |  | 441,036 |  |
Shares repurchased during period |  |  |  |  |  |  |  | $ 8,500,000 |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Amount of shares authorized to repurchase |  |  |  |  | $ 20,000,000 |  |  |  |  |
Private Placement [Member] | RenaissanceRe Ventures Ltd [Member] |  |  |  |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Number of common stock, shares issued | 583,771 |  |  |  |  |  |  |  |  |
Common stock, price per share | $ 17.13 | $ 17.13 |  |  |  |  |  |  |  |
Issuance of common stock | $ 10,000,000 | $ 10,000,000 |  |  |  |  |  |  |  |
Cash proceeds from private placement | 2,965,000 | 2,965,000 |  |  |  |  |  |  |  |
Proceeds used to cancellation of outstanding indebtedness, including accrued interest | $ 7,035,000 | $ 7,035,000 |  |  |  |  |  |  |  |
Series A [Member] |  |  |  |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Series A preferred stock pays a cumulative dividend |  |  | $ 0.25 | $ 0.25 | $ 0.25 | $ 0.25 |  |  |  |
Preferred stock aggregate dividends |  |  |  |  |  |  |  | $ 10,000 | $ 10,000 |

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