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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
Revenues                      
Net investment income $ 7,855 $ 8,006 $ 6,201 $ 6,044 $ 7,256 $ 6,923 $ 6,890 $ 6,833 $ 28,106 $ 27,902 $ 27,214
Fee and other income                 347 316 361
Total revenues 98,558 98,206 97,563 102,335 101,760 97,470 99,936 101,788 396,662 400,954 404,019
Expenses                      
Total expenses                 283,841 299,987 330,270
Income tax expense (benefit)                 34,956 30,505 20,083
Net income $ 19,073 $ 17,896 $ 16,639 $ 24,257 $ 23,073 $ 17,940 $ 14,319 $ 15,130 77,865 70,462 53,666
Parent Company [Member]                      
Revenues                      
Net investment income                 1,509 854 1,541
Fee and other income                 5,843 5,893 5,368
Total revenues                 7,352 6,747 6,909
Expenses                      
Other operating costs                 7,352 6,747 6,909
Total expenses                 7,352 6,747 6,909
Income tax expense (benefit)                 (156) (57) (13)
Gain (loss) before equity in earnings of subsidiaries                 156 57 13
Equity in net income of subsidiaries                 77,709 70,405 53,653
Net income                 $ 77,865 $ 70,462 $ 53,666