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Quarterly Results for 2015 and 2014 - Summary of Quarterly Results for the Periods Presented (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]                      
Net premiums earned $ 150,598 $ 146,153 $ 112,888 $ 94,360 $ 95,420 $ 94,288 $ 73,362 $ 63,807 $ 503,999 $ 326,877 $ 267,655
Investment income 1,779 1,307 1,207 862 801 644 412 518 5,155 2,375 1,928
Total revenues 162,100 157,043 123,591 103,810 104,482 103,500 86,989 74,305 546,544 369,276 301,159
Total expenses 114,220 109,143 82,371 65,787 67,556 66,348 56,580 51,188 371,521 241,672 200,603
Net income $ 29,152 $ 30,298 $ 24,704 $ 22,330 $ 20,972 $ 21,341 $ 17,126 $ 13,549 $ 106,484 [1] $ 72,988 [1] $ 58,977 [1]
Basic earnings per share $ 0.84 $ 0.87 $ 0.71 $ 0.65 $ 0.63 $ 0.64 $ 0.50 $ 0.41 $ 3.06 $ 2.17 $ 1.64
Diluted earnings per share $ 0.82 $ 0.84 $ 0.69 $ 0.62 $ 0.59 $ 0.61 $ 0.49 $ 0.38 $ 2.97 $ 2.08 $ 1.56
[1] See “—Note 8 (Stockholders’ Equity)” for an explanation of events subsequent to December 31, 2014 giving rise to pro-forma stockholders’ equity of $218.9 million as of December 31, 2014.