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Quarterly Results for 2016 and 2015 - Summary of Quarterly Results for the Periods Presented (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]                      
Premiums earned, net $ 163,973 $ 159,534 $ 156,461 $ 152,448 $ 150,598 $ 146,153 $ 112,888 $ 94,360 $ 632,416 $ 503,999 $ 326,877
Investment income 3,489 2,304 2,142 1,605 1,779 1,307 1,207 862 9,540 5,155 2,375
Total revenues 178,605 172,436 169,802 164,446 162,100 157,043 123,591 103,810 685,289 546,544 369,276
Total expenses 155,878 128,273 114,908 123,347 114,220 109,143 82,371 65,787 522,406 371,521 241,672
Net income $ 13,655 $ 26,882 $ 33,647 $ 25,226 $ 29,152 $ 30,298 $ 24,704 $ 22,330 $ 99,410 $ 106,484 $ 72,988
Basic earnings per share $ 0.39 $ 0.77 $ 0.96 $ 0.73 $ 0.84 $ 0.87 $ 0.71 $ 0.65 $ 2.85 $ 3.06 $ 2.17
Diluted earnings per share $ 0.38 $ 0.75 $ 0.94 $ 0.71 $ 0.82 $ 0.84 $ 0.69 $ 0.62 $ 2.79 $ 2.97 $ 2.08