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Other Comprehensive Income (Loss) - Reclassifications Out of Accumulated Other Comprehensive Income (Detail) - USD ($)
$ 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
Accumulated Other Comprehensive Income (Loss) [Line Items]                      
Net realized gains (losses) on investments                 $ 1,060 $ 5,627 $ (14,740)
Income taxes, current                 (69,232) (55,122) (34,216)
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]
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]                      
Accumulated Other Comprehensive Income (Loss) [Line Items]                      
Net realized gains (losses) on investments                 1,060 5,627 1,297
Income taxes, current                 (406) (2,171) (500)
NET INCOME                 $ 654 $ 3,456 $ 797
[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.