Annual report pursuant to Section 13 and 15(d)

Share-based Compensation - Share-Based Compensation Expense and Related Tax Benefits (Detail)

v3.20.4
Share-based Compensation - Share-Based Compensation Expense and Related Tax Benefits (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]      
Share-based compensation expense $ 2,544 $ 3,125 $ 3,515
Related tax benefits $ 734 $ 941 $ 984