XML 75 R52.htm IDEA: XBRL DOCUMENT v3.19.3
Property, Plant and Equipment - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Property, Plant and Equipment [Abstract]        
Depreciation expense $ 2,307 $ 2,190 $ 6,892 $ 6,573