Property, Plant and Equipment - Summary of Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 144,837	$ 134,520
Less: accumulated depreciation	(81,409)	(75,704)
Property, plant and equipment, net	77,489	73,068
Buildings and Related Structures [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	22,580	22,502
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	90,136	89,453
Finance Lease Right Of Use Assets [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	319	323
Others [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	31,802	22,242
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	$ 14,061	$ 14,252