Segment Information - Selected Financial Data by Business Segment (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
Segment Reporting Information [Line Items]
Revenues	$ 87,806	$ 102,115	$ 102,754	$ 96,948	$ 88,536	$ 87,620	$ 80,631	$ 75,105	$ 389,623	$ 331,892	$ 263,194
(Loss) income before income taxes	(5,822)	$ (327)	$ (30,607)	$ (8,374)	458	$ (4,524)	$ 690	$ 804	(45,130)	(2,572)	9,723
Total assets	400,074				402,127				400,074	402,127
Insurance
Segment Reporting Information [Line Items]
Revenues									388,323	331,828	263,133
(Loss) income before income taxes									(40,685)	338	12,549
Total assets	354,008				373,475				354,008	373,475
Real estate and Corporate
Segment Reporting Information [Line Items]
Revenues									1,300	64	61
(Loss) income before income taxes									(4,445)	(2,910)	$ (2,826)
Total assets	$ 46,066				$ 28,652				$ 46,066	$ 28,652