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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, 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
PREMIUMS EARNED AND OTHER REVENUES                      
Net investment income (expense) $ 3,489 $ 2,304 $ 2,142 $ 1,605 $ 1,779 $ 1,307 $ 1,207 $ 862 $ 9,540 $ 5,155 $ 2,375
Net realized gains (losses) on investments                 2,294 1,060 5,627
Other revenue                 6,426 6,020 6,210
Total premiums earned and other revenues 178,605 172,436 169,802 164,446 162,100 157,043 123,591 103,810 685,289 546,544 369,276
OPERATING COSTS AND EXPENSES                      
General and administrative expenses                 221,177 183,782 118,397
Total operating costs and expenses 155,878 128,273 114,908 123,347 114,220 109,143 82,371 65,787 522,406 371,521 241,672
INCOME BEFORE INCOME TAXES                 162,883 175,023 127,604
Benefit from income taxes                 63,473 68,539 54,616
NET INCOME $ 13,655 $ 26,882 $ 33,647 $ 25,226 $ 29,152 $ 30,298 $ 24,704 $ 22,330 99,410 106,484 72,988
Parent Company [Member]                      
PREMIUMS EARNED AND OTHER REVENUES                      
Net investment income (expense)                 (35) 22 (23)
Net realized gains (losses) on investments                 667 66 625
Management fee                 138 140 121
Other revenue                 80    
Total premiums earned and other revenues                 850 228 723
OPERATING COSTS AND EXPENSES                      
General and administrative expenses                 35,342 48,056 39,062
Total operating costs and expenses                 35,342 48,056 39,062
INCOME BEFORE INCOME TAXES                 (34,492) (47,828) (38,339)
Benefit from income taxes                 (12,055) (17,495) (16,403)
LOSS BEFORE EQUITY IN NET EARNINGS OF SUBSIDIARIES                 (22,437) (30,333) (21,936)
Equity in net income of subsidiaries                 121,847 136,817 94,924
NET INCOME                 $ 99,410 $ 106,484 $ 72,988