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Pension Plans - Accumulated Benefit Obligations in Excess of Plan Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Plans With Benefit Obligations In Excess Of Plan Assets [Abstract]    
Accumulated benefit obligation $ 37,936 $ 33,931
Fair market value of assets $ 32,658 $ 28,672