Segment Information - Selected Financial Data by Business Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Revenues	$ 91,411	$ 102,754	$ 179,480	$ 199,702
(Loss) income before income taxes	(1,480)	(30,607)	96	(38,981)	$ (45,100)
Total assets	414,828		414,828		400,074
Insurance
Segment Reporting Information [Line Items]
Revenues	91,394	101,501	179,447	198,434
(Loss) income before income taxes	(26)	(30,434)	2,942	(37,455)
Total assets	369,700		369,700		354,008
Real estate and Corporate
Segment Reporting Information [Line Items]
Revenues	17	1,253	33	1,268
(Loss) income before income taxes	(1,454)	$ (173)	(2,846)	$ (1,526)
Total assets	$ 45,128		$ 45,128		$ 46,066