Benefit Plans - Net Periodic Benefit Cost (Increase) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 0	$ 0
Interest cost	1,208	855	790
Return on plan assets	(2,824)	(3,456)	(3,227)
Amortization of net loss (gain)	709	0	472
Amortization of unrecognized prior service cost	0	0	0
Net periodic (benefit) increase cost	(907)	(2,601)	(1,965)
Post-retirement
Defined Benefit Plan Disclosure [Line Items]
Service cost	13	28	34
Interest cost	600	443	424
Return on plan assets	0	0	0
Amortization of net loss (gain)	(2,130)	(1,304)	(1,070)
Amortization of unrecognized prior service cost	0	0	0
Net periodic (benefit) increase cost	$ (1,517)	$ (833)	$ (612)