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Stockholders' Equity - Additional Information (Detail) - USD ($) | 1 Months Ended | 3 Months Ended | 4 Months Ended | 12 Months Ended | 19 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Apr. 30, 2016 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017 | Jun. 30, 2016
Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of common stock, shares issued |  |  |  |  |  |  |  | 584,000 |  |  |
Total consideration for issuance of common stock |  |  |  |  |  |  |  | $ 10,000,000 |  |  |
Treasury shares acquired |  |  |  |  |  |  | 771,000 | 441,000 | 748,000 |  |
Shares repurchased during period |  |  |  |  |  |  | $ 18,141,000 | $ 8,510,000 | $ 18,649,000 |  |
Received distributions from the earnings of subsidiaries |  |  |  |  |  |  | 122,200,000 | 46,900,000 | 58,200,000 |  |
Capital contributions to subsidiaries |  |  |  |  |  |  | 0 |  | 0 |  |
APPCIC [Member] |  |  |  |  |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Capital contributions to subsidiaries |  |  |  |  |  |  | $ 0 | 2,000,000 | $ 0 |  |
June 2016 Share Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Treasury shares acquired |  |  |  |  |  |  |  |  |  | 861,296 |
Shares repurchased during period |  |  |  |  |  |  |  |  |  | $ 20,000,000 |
Stock Repurchase Program Expiration Date |  |  |  |  |  |  |  |  |  | Dec. 31, 2017 |
September 2017 Share Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Treasury shares acquired |  |  |  |  |  | 8,192 |  |  |  |  |
Shares repurchased during period |  |  |  |  |  | $ 200,000 |  |  |  |  |
Stock Repurchase Program Expiration Date |  |  |  |  |  | Dec. 31, 2018 |  |  |  |  |
Open Market [Member] |  |  |  |  |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Treasury shares acquired |  |  |  |  |  |  | 770,559 |  |  |  |
Shares repurchased during period |  |  |  |  |  |  | $ 18,100,000 |  |  |  |
Maximum [Member] | June 2016 Share Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount of shares authorized to repurchase |  |  |  |  |  |  |  |  |  |  | $ 20,000,000
Maximum [Member] | September 2017 Share Repurchase Program [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 |  |  |  |  |  |  |  |  |  |
Total consideration for issuance of common stock | $ 10,000,000 |  |  |  |  |  |  |  |  |  |
Cash proceeds from private placement | 2,965,000 |  |  |  |  |  |  |  |  |  |
Amount of non-cash portion for cancellation of outstanding indebtedness, including accrued interest | $ 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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