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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
Revenues                      
Net investment income $ 7,312 $ 7,788 $ 7,471 $ 6,710 $ 7,855 $ 8,006 $ 6,201 $ 6,044 $ 29,281 $ 28,106 $ 27,902
Fee and other income                 420 347 316
Total revenues 94,937 92,804 89,925 97,542 98,558 98,206 97,563 102,335 375,208 396,662 400,954
Expenses                      
Total expenses                 292,968 283,841 299,987
Income tax expense (benefit)                 36,009 34,956 30,505
Net income $ 649 $ 16,577 $ 15,481 $ 13,524 $ 19,073 $ 17,896 $ 16,639 $ 24,257 46,231 77,865 70,462
Parent Company [Member]                      
Revenues                      
Net investment income                 679 1,509 854
Fee and other income                 6,890 5,843 5,893
Total revenues                 7,569 7,352 6,747
Expenses                      
Other operating costs                 7,569 7,352 6,747
Total expenses                 7,569 7,352 6,747
Income tax expense (benefit)                 125 (156) (57)
Gain (loss) before equity in earnings of subsidiaries                 (125) 156 57
Equity in net income of subsidiaries                 46,356 77,709 70,405
Net income                 $ 46,231 $ 77,865 $ 70,462