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Property, Plant And Equipment - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property Plant And Equipment [Abstract]      
Depreciation expense related to property, plant and equipment $ 8,154 $ 8,307 $ 8,953
Elimination of Assets and Accumulated depreciation $ 6,317 $ 16,652 $ 549