Property, Plant and Equipment, Net - Additional Information (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Depreciation expense	$ 7,300	$ 7,400
Property, plant and equipment, gross	151,359		$ 140,568
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	10,830		5,138
Statesboro, Georgia [Member] | Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 6,300		$ 2,300