Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 998,993	$ 990,364
Accumulated depreciation	(471,969)	(457,597)
Property, plant and equipment, net	527,024	532,767
Land and Buildings [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	137,655	140,471
Production Machinery and Technical Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	774,058	769,451
Leasehold Improvements and Others [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	12,730	12,883
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 74,550	$ 67,559