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Quarterly Results for 2020 and 2010 (Unaudited) - Summary of Quarterly Results for the Periods Presented (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]                      
Premiums earned, net $ 242,173 $ 234,191 $ 226,370 $ 220,829 $ 215,819 $ 206,599 $ 210,357 $ 209,727 $ 923,563 $ 842,502 $ 768,382
Net investment income 2,823 4,557 6,179 6,834 7,578 7,613 7,410 8,142 20,393 30,743 24,816
Total revenues 273,126 311,665 252,704 235,275 239,402 229,641 233,722 236,586 1,072,770 939,351 823,816
Total expenses 300,125 315,457 225,266 207,691 308,455 201,745 182,792 182,842 1,048,539 875,834 670,943
Net income (loss) $ (17,675) $ (3,169) $ 19,882 $ 20,067 $ (51,073) $ 20,146 $ 37,293 $ 40,148 $ 19,105 $ 46,514 $ 117,051
Basic earnings per share (in dollars per share) $ (0.57) $ (0.10) $ 0.62 $ 0.62 $ (1.55) $ 0.60 $ 1.09 $ 1.16 $ 0.60 $ 1.37 $ 3.36
Diluted earnings per share (in dollars per share) $ (0.57) $ (0.10) $ 0.62 $ 0.61 $ (1.55) $ 0.59 $ 1.08 $ 1.14 $ 0.60 $ 1.36 $ 3.27