Segment Information - Selected Financial Data by Business Segment (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
Segment Reporting Information [Line Items]
Revenues	$ 82,054	$ 85,984	$ 91,411	$ 88,069	$ 87,806	$ 102,115	$ 102,754	$ 96,948	$ 347,518	$ 389,623	$ 331,892
Income (loss) before income taxes	3,139	$ 3,351	$ (1,480)	$ 1,576	(5,822)	$ (327)	$ (30,607)	$ (8,374)	6,586	(45,130)	(2,572)
Total assets	395,859				400,074				395,859	400,074
Insurance
Segment Reporting Information [Line Items]
Revenues									347,448	388,323	331,828
Income (loss) before income taxes									12,483	(40,685)	338
Total assets	361,869				354,008				361,869	354,008
Real estate and Corporate
Segment Reporting Information [Line Items]
Revenues									70	1,300	64
Income (loss) before income taxes									(5,897)	(4,445)	$ (2,910)
Total assets	$ 33,990				$ 46,066				$ 33,990	$ 46,066