Retirement Plans - Schedule of Weighted-Average Assumptions Used to Determine Net Periodic Cost (Detail)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Net Periodic Benefit Cost Assumptions [Line Items]
Discount rate	5.33%	4.90%	5.31%
Health care cost trend: Ultimate	4.75%	4.75%	4.75%
Year ultimate reached	2034	2033	2029
Corridor	10.00%	10.00%	10.00%
Recognition period for gains and losses	8 years 3 months 18 days	8 years 9 months 18 days	9 years 3 months 18 days
Net Periodic Cost [Member]
Net Periodic Benefit Cost Assumptions [Line Items]
Health care cost trend: Initial	7.45%	6.95%	6.50%
Year ultimate reached	2033	2029	2028