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Amounts Recognized in Accumulated Other Comprehensive Loss Net of Tax (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan [Abstract]    
Net actuarial loss $ 598 $ 514
Prior service cost 460 616
Gross amount recognized 1,058 1,130
Deferred income taxes (267) (270)
Net amount recognized $ 791 $ 860