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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
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