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Schedule II - Condensed Financial Information of Registrant - Condensed Statements of 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
PREMIUMS EARNED AND OTHER REVENUES                      
Net investment income (expense) $ 1,779 $ 1,307 $ 1,207 $ 862 $ 801 $ 644 $ 412 $ 518 $ 5,155 $ 2,375 $ 1,928
Net realized gains (losses) on investments                 1,060 5,627 (14,740)
Net change in unrealized gains (losses) on investments                     7,850
Total premiums earned and other revenues 162,100 157,043 123,591 103,810 104,482 103,500 86,989 74,305 546,544 369,276 301,159
OPERATING COSTS AND EXPENSES                      
General and administrative expenses                 183,782 118,397 91,988
Total operating costs and expenses 114,220 109,143 82,371 65,787 67,556 66,348 56,580 51,188 371,521 241,672 200,603
INCOME BEFORE INCOME TAXES                 175,023 127,604 100,556
Benefit from income taxes                 68,539 54,616 41,579
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]
Parent Company [Member]                      
PREMIUMS EARNED AND OTHER REVENUES                      
Net investment income (expense)                 22 (23) 207
Net realized gains (losses) on investments                 66 625 (2,947)
Net change in unrealized gains (losses) on investments                     1,625
Management fee                 140 121 134
Total premiums earned and other revenues                 228 723 (981)
OPERATING COSTS AND EXPENSES                      
General and administrative expenses                 48,056 39,062 32,476
Total operating costs and expenses                 48,056 39,062 32,476
INCOME BEFORE INCOME TAXES                 (47,828) (38,339) (33,457)
Benefit from income taxes                 (17,495) (16,403) (13,834)
LOSS BEFORE EQUITY IN NET EARNINGS OF SUBSIDIARIES                 (30,333) (21,936) (19,623)
Equity in net income of subsidiaries                 136,817 94,924 78,600
NET INCOME                 $ 106,484 $ 72,988 $ 58,977
[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.