Goodwill and Intangible Assets - Summary of Other Intangible Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Finite Lived Intangible Assets [Line Items]
Cost	$ 35,197	$ 35,197
Accumulated Amortization	32,212	31,922
Net Book Value	2,985	3,275
Customer Contracts and Relationships [Member]
Finite Lived Intangible Assets [Line Items]
Cost	17,380	17,380
Accumulated Amortization	17,380	17,380
Net Book Value	0	0
Patents and Technology [Member]
Finite Lived Intangible Assets [Line Items]
Cost	10,114	10,114
Accumulated Amortization	8,169	8,004
Net Book Value	1,945	2,110
Trademarks and Trade Names [Member]
Finite Lived Intangible Assets [Line Items]
Cost	4,960	4,960
Accumulated Amortization	4,199	4,111
Net Book Value	761	849
Other [Member]
Finite Lived Intangible Assets [Line Items]
Cost	2,743	2,743
Accumulated Amortization	2,464	2,427
Net Book Value	$ 279	$ 316