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Pension Plans - Projected Benefit Obligation and Fair Value of Plan Assets (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Funded Status Of Plan [Abstract]      
Projected benefit obligation at beginning of the year $ 33,931 $ 36,031  
Service cost 299 250 $ 255
Interest cost 1,411 1,349 1,456
Actuarial loss (gain) 3,528 (2,409)  
Benefits paid (1,233) (1,290)  
Projected benefit obligation at end of year 37,936 33,931 36,031
Fair value of plan assets at beginning of the year 28,672 25,367  
Actual return on plan assets 5,219 (745)  
Employer contributions 0 5,340  
Benefits paid (1,233) (1,290)  
Fair value of plan assets at end of the year 32,658 28,672 $ 25,367
Unfunded pension obligation $ 5,278 $ 5,259