XML 78 R61.htm IDEA: XBRL DOCUMENT v3.20.4
Property and Equipment - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]      
Depreciation and amortization expense $ 19,963 $ 18,808 $ 16,747