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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 |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2018 | Apr. 30, 2016 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2016
Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Series A preferred stock pays a cumulative dividend |  |  |  |  |  |  |  | $ 1.00 | $ 1.00 | $ 1.00 |  |  |
Shares reissued |  |  |  |  |  |  |  |  |  | 584,000 |  |  |
Total consideration for issuance of common stock |  |  |  |  |  |  |  |  |  | $ 10,000,000 |  |  |
Treasury shares acquired |  |  |  |  |  |  |  | 688,000 | 771,000 | 441,000 |  |  |
Shares repurchased during period |  |  |  |  |  |  |  | $ 25,276,000 | $ 18,141,000 | $ 8,510,000 |  |  |
Received distributions from the earnings of subsidiaries |  |  |  |  |  |  |  | 96,600,000 | 122,200,000 | 46,900,000 |  |  |
Capital contributions to subsidiaries |  |  |  |  |  |  |  | 0 | 0 |  |  |  |
APPCIC |  |  |  |  |  |  |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Capital contributions to subsidiaries |  |  |  |  |  |  |  | $ 0 | 0 | $ 2,000,000.0 |  |  |
June 2016 Share Repurchase Program |  |  |  |  |  |  |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of shares authorized to repurchase |  |  |  |  |  |  |  |  |  |  |  |  | $ 20,000,000
Stock repurchase program expiration date |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2017 |  |
Treasury shares acquired |  |  |  |  |  |  |  |  |  |  | 861,296 |  |
Shares repurchased during period |  |  |  |  |  |  |  |  |  |  | $ 20,000,000.0 |  |
September 2017 Share Repurchase Program |  |  |  |  |  |  |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program expiration date |  |  |  |  |  |  | Dec. 31, 2018 |  |  |  |  |  |
Treasury shares acquired |  |  |  |  |  |  | 558,647 |  |  |  |  |  |
Shares repurchased during period |  |  |  |  |  |  | $ 20,000,000.0 |  |  |  |  |  |
December 2018 Share Repurchase Program |  |  |  |  |  |  |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury shares acquired | 138,234 |  |  |  |  |  |  |  |  |  |  |  |
Shares repurchased during period | $ 5,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Open Market |  |  |  |  |  |  |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury shares acquired |  |  |  |  |  |  |  | 688,689 |  |  |  |  |
Shares repurchased during period |  |  |  |  |  |  |  | $ 25,300,000 |  |  |  |  |
Maximum | September 2017 Share Repurchase Program |  |  |  |  |  |  |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of shares authorized to repurchase |  |  |  |  |  |  |  |  |  |  |  | $ 20,000,000 |
Maximum | December 2018 Share Repurchase Program |  |  |  |  |  |  |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of shares authorized to repurchase | $ 20,000,000 |  | $ 20,000,000 |  |  |  |  | 20,000,000 |  |  |  |  |
Private Placement | RenaissanceRe Ventures Ltd |  |  |  |  |  |  |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Shares reissued |  | 583,771 |  |  |  |  |  |  |  |  |  |  |
Common stock, price per share (in dollars 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 |  | $ 7,035,000.000 |  |  |  |  |  |  |  |  |  |  |
Series A |  |  |  |  |  |  |  |  |  |  |  |  |
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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