Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 955,078	$ 928,038
Accumulated depreciation	(423,733)	(391,352)
Property, plant and equipment, net	531,345	536,686
Land and Buildings [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	137,987	136,918
Production Machinery and Technical Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	740,413	720,175
Leasehold Improvements and Others [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	12,281	12,192
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 64,397	$ 58,753