Intangibles, Net - Schedule of Intangibles, Net (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Cost	$ 119,022	$ 155,453
Accumulated Amortization	(109,889)	(143,655)
Net	9,133	11,798
Trademarks
Finite-Lived Intangible Assets [Line Items]
Cost	13,540	13,540
Accumulated Amortization	(9,856)	(9,304)
Net	3,684	4,236
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Cost	98,912	99,133
Accumulated Amortization	(93,463)	(92,072)
Net	5,449	7,061
Patents
Finite-Lived Intangible Assets [Line Items]
Cost	6,570	42,780
Accumulated Amortization	(6,570)	(42,279)
Net	$ 0	$ 501