XML 61 R49.htm IDEA: XBRL DOCUMENT v3.20.4
Property Plant And Equipment - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Property Plant And Equipment [Abstract]      
Depreciation on property,plant and equipment $ 6,703 $ 7,366 $ 7,027