Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 1,029,420	$ 990,364
Accumulated depreciation	(490,727)	(457,597)
Property, plant and equipment, net	538,693	532,767
Land and Buildings [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	140,696	140,471
Production Machinery and Technical Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	791,359	769,451
Leasehold Improvements and Other [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	13,435	12,883
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 83,930	$ 67,559