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Quarterly Results for 2013 and 2012 - Summary of Quarterly Results for the Periods Presented (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract]                      
Net premiums earned $ 66,452 $ 68,927 $ 66,867 $ 65,409 $ 67,274 $ 59,512 $ 55,694 $ 48,640 $ 267,655 $ 231,120 $ 198,985
Investment income 1,397 382 137 12 278 215 (16) (36) 1,928 441 788
Total revenues 77,580 78,368 77,756 67,455 75,227 74,537 59,928 60,247 301,159 269,939 225,861
Total expenses 51,587 53,255 48,068 47,693 65,863 60,563 46,936 44,018 200,603 217,380 192,143
Net income $ 15,582 $ 14,407 $ 17,029 $ 11,959 $ 4,406 $ 8,256 $ 7,777 $ 9,873 $ 58,977 $ 30,312 $ 20,109
Basic earnings per share $ 0.46 $ 0.43 $ 0.47 $ 0.30 $ 0.11 $ 0.21 $ 0.20 $ 0.24 $ 1.64 $ 0.76 $ 0.51
Diluted earnings per share $ 0.44 $ 0.40 $ 0.44 $ 0.29 $ 0.11 $ 0.20 $ 0.19 $ 0.24 $ 1.56 $ 0.75 $ 0.50