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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Change in benefit obligation      
Projected benefit obligation at beginning of year $ 1,754 $ 5,838 $ 5,131
Service cost 5 275 568
Interest cost 5 91 126
Actuarial loss (gain) (8) 72 146
Benefits paid (40) (450) (133)
Disposal of subsidiary   (4,072)  
Projected benefit obligation at end of year 1,716 1,754 5,838
Change in plan assets      
Fair value of plan assets at beginning of year 1,487 5,410 5,114
Actual return on plan assets 49 98 63
Employer contributions 49 85 331
Benefits paid (34) (448) (98)
Disposal of subsidiary   (3,658)  
Fair value of plan assets at end of year 1,551 1,487 5,410
Funded status recognized as an other liabilities $ (165) $ (267) $ (428)