Annual report pursuant to Section 13 and 15(d)

Soft Dollar Arrangements - Additional Information (Detail)

v3.20.4
Soft Dollar Arrangements - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Soft Dollar Arrangements [Abstract]      
Soft dollar credits $ 824 $ 997 $ 772