Postretirement Benefit Plans - Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost	$ 690	$ (302)	$ 874
United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	4,923	4,671	5,668
Expected return on plan assets	(8,802)	(10,348)	(9,747)
Amortization of net actuarial loss	2,277	4,444	4,262
Net periodic benefit cost	(1,602)	(1,233)	183
United Kingdom [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	374	357	445
Expected return on plan assets	(399)	(320)	(548)
Amortization of net actuarial loss	9	129	79
Net periodic benefit cost	$ (16)	$ 166	$ (24)