XML 52 R42.htm IDEA: XBRL DOCUMENT v3.10.0.1
Property, Plant And Equipment - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Property Plant And Equipment [Abstract]        
Depreciation expense related to property, plant and equipment $ 2,055 $ 2,129 $ 4,146 $ 4,313
Elimination of Assets and Accumulated depreciation $ 3,219 $ 3,584 $ 3,347 $ 4,759