Goodwill and Intangible Assets - Summary of Other Intangible Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Cost	$ 43,314	$ 30,148
Accumulated Amortization	30,880	27,511
Net Book Value	12,434	2,637
Customer Contracts and Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	25,497	17,381
Accumulated Amortization	17,880	15,933
Net Book Value	7,617	1,448
Patents and Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	10,114	6,781
Accumulated Amortization	7,171	6,507
Net Book Value	2,943	274
Trademarks and Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	4,960	3,988
Accumulated Amortization	3,631	3,152
Net Book Value	1,329	836
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	2,743	1,998
Accumulated Amortization	2,198	1,919
Net Book Value	$ 545	$ 79