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Retirement Plans - Schedule of Amounts Recognized in Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net (gain) loss	$ (590)	$ (575)	$ (461)
Transition obligation	244	305	364
Total	(346)	$ (270)	$ (97)
Postretirement Benefit Costs [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net (gain) loss	(108)
Transition obligation	76
Total	$ (32)

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