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Property, Plant And Equipment - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Property Plant And Equipment [Abstract]        
Depreciation expense related to property, plant and equipment $ 2,129 $ 2,059 $ 4,079 $ 4,313
Elimination of Assets and Accumulated depreciation $ 3,584 $ 2 $ 4,759 $ 125