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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
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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

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