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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, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
PREMIUMS EARNED AND OTHER REVENUES                      
Net investment income (expense) $ 4,448 $ 3,085 $ 3,223 $ 2,704 $ 3,489 $ 2,304 $ 2,142 $ 1,605 $ 13,460 $ 9,540 $ 5,155
Net realized gains (losses) on investments                 2,570 2,294 1,060
Other revenue                 7,002 6,426 6,020
Total premiums earned and other revenues 201,312 190,243 185,487 174,874 178,605 172,436 169,802 164,446 751,916 685,289 546,544
OPERATING COSTS AND EXPENSES                      
General and administrative expenses                 231,004 221,177 183,782
Total operating costs and expenses 142,721 173,644 137,564 127,503 155,878 128,273 114,908 123,347 581,432 522,406 371,521
INCOME BEFORE INCOME TAXES                 170,484 162,883 175,023
Benefit from income taxes                 63,549 63,473 68,539
NET INCOME $ 36,396 $ 9,964 $ 29,376 $ 31,199 $ 13,655 $ 26,882 $ 33,647 $ 25,226 106,935 99,410 106,484
Parent Company [Member]                      
PREMIUMS EARNED AND OTHER REVENUES                      
Net investment income (expense)                 259 (35) 22
Net realized gains (losses) on investments                 255 667 66
Management fee                 151 138 140
Other revenue                 12 80  
Total premiums earned and other revenues                 677 850 228
OPERATING COSTS AND EXPENSES                      
General and administrative expenses                 30,819 35,342 48,056
Total operating costs and expenses                 30,819 35,342 48,056
INCOME BEFORE INCOME TAXES                 (30,142) (34,492) (47,828)
Benefit from income taxes                 (18,296) (12,055) (17,495)
LOSS BEFORE EQUITY IN NET EARNINGS OF SUBSIDIARIES                 (11,846) (22,437) (30,333)
Equity in net income of subsidiaries                 118,781 121,847 136,817
NET INCOME                 $ 106,935 $ 99,410 $ 106,484