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Property, Plant And Equipment - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Property Plant And Equipment [Abstract]        
Depreciation expense related to property, plant and equipment $ 1,577,000 $ 2,055,000 $ 3,225,000 $ 4,146,000
Elimination of Assets and Accumulated depreciation $ 0 $ 3,219,000 $ 710,000 $ 3,347,000