Goodwill and Other Intangible Assets, Net - Schedule of Other Intangible Assets, Net (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Total carrying value	$ 626,243	$ 633,077
Total accumulated amortization	(234,817)	(217,290)
Other intangible assets, net	391,426	415,787
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Total carrying value	402,032	407,636
Total accumulated amortization	(116,519)	(104,800)
Trade names & patents
Finite-Lived Intangible Assets [Line Items]
Total carrying value	38,146	38,771
Total accumulated amortization	(16,998)	(15,241)
Technological know-how
Finite-Lived Intangible Assets [Line Items]
Total carrying value	161,331	161,856
Total accumulated amortization	(81,580)	(76,766)
Other
Finite-Lived Intangible Assets [Line Items]
Total carrying value	24,734	24,814
Total accumulated amortization	$ (19,720)	$ (20,483)