Property, Plant and Equipment, Net - Property, Plant and Equipment Details (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost	$ 410,209	$ 408,308
Accumulated depreciation	(98,087)	(81,901)
Total property, plant and equipment, net	312,122	326,407
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost	12,927	12,925
Buildings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost	112,572	112,121
Plant machinery
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost	273,395	272,613
Mobile equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost	5,815	3,837
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost	$ 5,500	$ 6,812