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Stockholders' Equity - Additional Information (Detail) - USD ($) |  |  |  | 1 Months Ended | 3 Months Ended | 8 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 31, 2016 | Apr. 13, 2016 | Jan. 14, 2016 | Sep. 30, 2016 | Apr. 30, 2016 | Sep. 30, 2016 | Sep. 30, 2015 | Jun. 30, 2016 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015 | Nov. 30, 2015
Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amount of shares authorized to repurchase |  |  |  |  |  |  |  | $ 20,000,000 |  |  |  | $ 10,000,000
Treasury shares acquired |  |  |  | 95,000 |  |  |  | 342,107 |  |  |  |
Shares repurchased during period |  |  |  | $ 2,000,000 |  |  |  | $ 6,400,000 |  |  |  |
Common stock, par value |  |  |  | $ 0.01 |  | $ 0.01 |  |  | $ 0.01 |  | $ 0.01 |
Issuance of common stock |  |  |  |  |  |  |  |  |  | $ 511,000 |  |
Dividends per share declared on outstanding common stock | $ 0.14 | $ 0.14 | $ 0.14 |  |  | $ 0.14 | $ 0.12 |  | $ 0.42 | $ 0.36 |  |
Installment1-FY2016 |  |  |  |  |  |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Dividends payable date |  |  |  |  |  |  |  |  | Mar. 02, 2016 |  |  |
Dividends payable, shareholders record date |  |  |  |  |  |  |  |  | Feb. 18, 2016 |  |  |
Installment2-FY2016 |  |  |  |  |  |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Dividends payable date |  |  |  |  |  |  |  |  | Jul. 05, 2016 |  |  |
Dividends payable, shareholders record date |  |  |  |  |  |  |  |  | Jun. 15, 2016 |  |  |
Installment3-FY2016 |  |  |  |  |  |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Dividends payable date |  |  |  |  |  |  |  |  | Oct. 24, 2016 |  |  |
Dividends payable, shareholders record date |  |  |  |  |  |  |  |  | Sep. 12, 2016 |  |  |
Private Placement [Member] | RenaissanceRe Ventures Ltd [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of common stock, shares issued |  |  |  |  | 583,771 |  |  |  |  |  |  |
Common stock, par value |  |  |  |  | $ 17.13 |  |  |  |  |  |  |
Issuance of common stock |  |  |  |  | $ 10,000,000 |  |  |  |  |  |  |
Cash proceeds from private placement |  |  |  |  | 2,965,000 |  |  |  |  |  |  |
Proceeds used to cancellation of outstanding indebtedness |  |  |  |  | $ 7,035,000 |  |  |  |  |  |  |

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