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Quarterly Results for 2019 and 2018 - Summary of Quarterly Results for the Periods Presented (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Premiums earned, net | $ 215,819 | $ 206,599 | $ 210,357 | $ 209,727 | $ 204,595 | $ 188,938 | $ 192,272 | $ 182,577 | $ 842,502 | $ 768,382 | $ 688,793
Net investment income | 7,578 | 7,613 | 7,410 | 8,142 | 7,603 | 6,642 | 5,786 | 4,785 | 30,743 | 24,816 | 13,460
Total revenues | 239,402 | 229,641 | 233,722 | 236,586 | 216,373 | 206,155 | 209,788 | 191,500 | 939,351 | 823,816 | 751,916
Total expenses | 308,455 | 201,745 | 182,792 | 182,842 | 227,614 | 154,988 | 148,540 | 139,801 | 875,834 | 670,943 | 581,432
Net income (loss) | $ (51,073) | $ 20,146 | $ 37,293 | $ 40,148 | $ (6,468) | $ 37,380 | $ 46,084 | $ 40,055 | $ 46,514 | $ 117,051 | $ 106,935
Basic earnings per share (in dollars per share) | $ (1.55) | $ 0.60 | $ 1.09 | $ 1.16 | $ (0.19) | $ 1.07 | $ 1.32 | $ 1.15 | $ 1.37 | $ 3.36 | $ 3.07
Diluted earnings per share (in dollars per share) | $ (1.55) | $ 0.59 | $ 1.08 | $ 1.14 | $ (0.19) | $ 1.04 | $ 1.29 | $ 1.12 | $ 1.36 | $ 3.27 | $ 2.99

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