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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, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
PREMIUMS EARNED AND OTHER REVENUES                      
Net investment income $ 7,603 $ 6,642 $ 5,786 $ 4,785 $ 4,448 $ 3,085 $ 3,223 $ 2,704 $ 24,816 $ 13,460 $ 9,540
Net realized gains (losses) on sale of securities                 (2,089) 2,570 2,294
Net change in unrealized gains (losses) of equity securities (8,000)               (17,169) 0 0
Other revenue                 7,163 7,002 6,426
Total premiums earned and other revenues 216,373 206,155 209,788 191,500 201,312 190,243 185,487 174,874 823,816 751,916 685,289
OPERATING COSTS AND EXPENSES                      
General and administrative expenses                 256,488 231,004 221,177
Total operating costs and expenses 227,614 154,988 148,540 139,801 142,721 173,644 137,564 127,503 670,943 581,432 522,406
INCOME BEFORE INCOME TAXES                 152,873 170,484 162,883
Benefit from income taxes                 35,822 63,549 63,473
NET INCOME $ (6,468) $ 37,380 $ 46,084 $ 40,055 $ 36,396 $ 9,964 $ 29,376 $ 31,199 117,051 106,935 99,410
Parent Company                      
PREMIUMS EARNED AND OTHER REVENUES                      
Net investment income                 1,635 259 (35)
Net realized gains (losses) on sale of securities                 0 255 667
Net change in unrealized gains (losses) of equity securities                 (2,648) 0 0
Management fee                 157 151 138
Other revenue                 0 12 80
Total premiums earned and other revenues                 (856) 677 850
OPERATING COSTS AND EXPENSES                      
General and administrative expenses                 32,063 30,819 35,342
Total operating costs and expenses                 32,063 30,819 35,342
INCOME BEFORE INCOME TAXES                 (32,919) (30,142) (34,492)
Benefit from income taxes                 (10,434) (18,296) (12,055)
LOSS BEFORE EQUITY IN NET EARNINGS OF SUBSIDIARIES                 (22,485) (11,846) (22,437)
Equity in net income of subsidiaries                 139,987 118,781 121,847
NET INCOME                 $ 117,502 $ 106,935 $ 99,410