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Postretirement Benefit Plans - Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost	$ (31)	$ (253)	$ (62)	$ (508)
United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	1,646	1,700	3,292	3,400
Expected return on plan assets	(1,847)	(2,003)	(3,695)	(4,005)
Amortization of net actuarial loss (gain)	109	(19)	217	(38)
Net periodic benefit cost	(92)	(322)	(186)	(643)
United Kingdom [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	178	178	357	346
Expected return on plan assets	(201)	(206)	(403)	(400)
Amortization of net actuarial loss (gain)	85	97	170	189
Net periodic benefit cost	$ 62	$ 69	$ 124	$ 135

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Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.

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