Reorganization - Schedule of Rolls Forward of Activity in Reorganization Accrual (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Restructuring Cost And Reserve [Line Items]
Accrual Beginning Balance		$ 481
Additions	$ 928	1,026	$ 4,433
Cash payments		(1,507)
Workforce Reduction [Member]
Restructuring Cost And Reserve [Line Items]
Accrual Beginning Balance		41
Additions		1,022
Cash payments		(1,063)
Subsidiary Liquidation [Member]
Restructuring Cost And Reserve [Line Items]
Accrual Beginning Balance		7
Cash payments		(7)
Products Group Reorganization [Member]
Restructuring Cost And Reserve [Line Items]
Accrual Beginning Balance		433
Additions		4
Cash payments		$ (437)