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Property, Plant And Equipment - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Property Plant And Equipment [Abstract]        
Depreciation expense related to property, plant and equipment $ 2,020 $ 2,033 $ 6,166 $ 6,112
Elimination of Assets and Accumulated depreciation $ 249 $ 1,126 $ 3,596 $ 5,884