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Changes in Benefits Obligation and Plan Assets and Reconciliation of Funded Status (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Change in benefit obligation      
Projected benefit obligation at beginning of year $ 1,716 $ 1,754 $ 5,838
Service cost 35 5 275
Interest cost 20 5 91
Actuarial loss (gain) 142 (8) 72
Benefits paid (110) (40) (450)
Disposal of subsidiary     (4,072)
Projected benefit obligation at end of year 1,803 1,716 1,754
Change in plan assets      
Fair value of plan assets at beginning of year 1,551 1,487 5,410
Actual return on plan assets 48 49 98
Employer contributions 70 49 85
Benefits paid (30) (34) (448)
Disposal of subsidiary     (3,658)
Fair value of plan assets at end of year 1,639 1,551 1,487
Funded status recognized as an other liabilities $ (164) $ (165) $ (267)