XML 33 R111.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Deferred Compensation Plans - Summary of Changes in Deferred Compensation Plan Liability (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Postemployment Benefits [Roll Forward]      
Balance, beginning of year $ 2,408 $ 2,503 $ 2,080
Deferrals, dividends, and changes in fair value recorded as an expense 904 64 444
Deferred compensation payments (78) (159) (21)
Balance, end of year $ 3,234 $ 2,408 $ 2,503