Income Taxes - Summary of Benefit (Provision) for Income Taxes from Continuing Operation (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
Current:
United States federal									$ (1,649)	$ (1,426)	$ (218)
State and local									859	(12)	(12)
Foreign									(442)	(389)	(75)
Total current									(1,232)	(1,827)	(305)
Deferred:
United States federal									(24,261)	585	(2,137)
State and local									0	0	0
Foreign									(28)	(349)	246
Total deferred									(24,289)	236	(1,891)
Income tax, total	$ (26,785)	$ (3,760)	$ 3,323	$ 1,701	$ 56	$ (1,015)	$ (668)	$ 36	$ (25,521)	$ (1,591)	$ (2,196)