Property, Plant and Equipment, at Cost (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	$ 711,246	$ 672,850
Less: Accumulated depreciation	(356,213)	(319,473)
Total property, plant and equipment, net	355,033	353,377
Land
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	68,562	68,562
Buildings and Leasehold Improvements
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	193,427	163,333
Machinery and Equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	$ 449,257	$ 440,955