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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, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
PREMIUMS EARNED AND OTHER REVENUES                      
Net investment income $ 7,578 $ 7,613 $ 7,410 $ 8,142 $ 7,603 $ 6,642 $ 5,786 $ 4,785 $ 30,743 $ 24,816 $ 13,460
Net realized gains (losses) on investments                 (12,715) (2,089) 2,570
Net change in unrealized gains (losses) of equity securities                 23,188 (17,169) 0
Other revenue                 7,972 7,163 7,002
Total premiums earned and other revenues 239,402 229,641 233,722 236,586 216,373 206,155 209,788 191,500 939,351 823,816 751,916
OPERATING COSTS AND EXPENSES                      
General and administrative expenses                 272,428 256,488 231,004
Total operating costs and expenses 308,455 201,745 182,792 182,842 227,614 154,988 148,540 139,801 875,834 670,943 581,432
INCOME BEFORE INCOME TAXES                 63,517 152,873 170,484
Benefit from income taxes                 17,003 35,822 63,549
NET INCOME $ (51,073) $ 20,146 $ 37,293 $ 40,148 $ (6,468) $ 37,380 $ 46,084 $ 40,055 46,514 117,051 106,935
Parent Company [Member]                      
PREMIUMS EARNED AND OTHER REVENUES                      
Net investment income                 2,249 1,635 259
Net realized gains (losses) on investments                 (1,908) 0 255
Net change in unrealized gains (losses) of equity securities                 3,186 (2,648) 0
Management fee                 166 157 151
Other revenue                 10 0 12
Total premiums earned and other revenues                 3,703 (856) 677
OPERATING COSTS AND EXPENSES                      
General and administrative expenses                 21,526 32,063 30,819
Total operating costs and expenses                 21,526 32,063 30,819
INCOME BEFORE INCOME TAXES                 (17,823) (32,919) (30,142)
Benefit from income taxes                 (2,984) (10,434) (18,296)
LOSS BEFORE EQUITY IN NET EARNINGS OF SUBSIDIARIES                 (14,839) (22,485) (11,846)
Equity in net income of subsidiaries                 61,336 139,987 118,781
NET INCOME                 $ 46,497 $ 117,502 $ 106,935