Retirement Plans - Defined Benefit Plan, Fair Value of Plan Assets, Unobservable Input Reconciliation (Detail) - Bank and Insurance Investment Contracts [Member] - Significant Unobservable Inputs (Level 3) [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of defined benefit plan assets, beginning balance	$ 61,427	$ 66,191
Net purchases (sales) and appreciation (depreciation) of defined benefit plan assets	8,790	(4,764)
Fair value of defined benefit plan assets, ending balance	$ 70,217	$ 61,427

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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