Reorganization - Schedule of Rolls Forward of Activity in Reorganization Accrual (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Restructuring Cost And Reserve [Line Items]
Accrual Beginning Balance	$ 481
Additions	1,026	$ 4,433
Cash payments	(1,507)
Accrual Ending Balance		481
Workforce Reduction [Member]
Restructuring Cost And Reserve [Line Items]
Accrual Beginning Balance	41
Additions	1,022
Cash payments	(1,063)
Accrual Ending Balance		41
Subsidiary Liquidation [Member]
Restructuring Cost And Reserve [Line Items]
Accrual Beginning Balance	7
Cash payments	(7)
Accrual Ending Balance		7
Products Group Reorganization [Member]
Restructuring Cost And Reserve [Line Items]
Accrual Beginning Balance	433
Additions	4
Cash payments	$ (437)
Accrual Ending Balance		$ 433