Property, Plant and Equipment - Summary 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	$ 417,559	$ 421,168
Less: accumulated depreciation	(235,894)	(231,356)
Property, plant and equipment, net	197,034	205,903
Buildings and Related Structures [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	70,194	69,958
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	302,207	308,713
Others [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	45,158	42,497
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	$ 15,369	$ 16,091