Goodwill and Intangible Assets - Summary of Other Intangible Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Cost	$ 42,684	$ 30,148
Accumulated Amortization	29,755	27,511
Net Book Value	12,929	2,637
Customer Contracts and Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	24,895	17,381
Accumulated Amortization	17,104	15,933
Net Book Value	7,791	1,448
Patents and Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	10,114	6,781
Accumulated Amortization	7,004	6,507
Net Book Value	3,110	274
Trademarks and Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	4,960	3,988
Accumulated Amortization	3,524	3,152
Net Book Value	1,436	836
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	2,715	1,998
Accumulated Amortization	2,123	1,919
Net Book Value	$ 592	$ 79