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Property, Plant and Equipment, Net (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 569,559 $ 556,518
Less: Accumulated depreciation and amortization (389,860) (381,122)
Property, plant and equipment, net $ 179,699 $ 175,396