Pension Plans and Postretirement Benefits - Obligations and Funded Status (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Change in benefit obligation:
Service cost			$ 15,100	$ 7,900	$ 7,900
Actuarial loss (gain)	$ (6,600)	$ 10,600
Change in plan assets:
Fair value of plan assets at beginning of period			865,552
Company contributions			32,878
Fair value of plan assets at the end of period	1,369,558	865,552	1,369,558	865,552
Amounts recognized in the balance sheet consist of:
Accumulated postretirement benefit obligation	(78,460)	(16,515)	(78,460)	(16,515)
Pension liability	(78,167)	(82,602)	(78,167)	(82,602)
Pension Benefits
Change in benefit obligation:
Benefit obligation at beginning of period			892,914	954,369
Service cost			13,156	7,523	7,515
Interest cost			58,820	45,513	47,638
Plan participants' contributions			5,340	156
Amendments			4,642	1,307
Acquisitions			453,635	0
Settlements			0	0
Actuarial loss (gain)			36,707	(50,535)
Foreign currency exchange rate changes			2,028	(2,814)
Benefits paid			(75,571)	(62,605)
Benefit obligation at end of period	1,391,671	892,914	1,391,671	892,914	954,369
Change in plan assets:
Fair value of plan assets at beginning of period			818,153	878,942
Actual return on plan assets			96,974	271
Plan participants' contributions			5,340	156
Company contributions				4,611
Settlements			0	0
Acquisitions			421,730	0
Foreign currency exchange rate changes			23,586	(3,222)
Benefits paid			(75,571)	(62,605)
Fair value of plan assets at the end of period	1,323,090	818,153	1,323,090	818,153	878,942
Funded status	(68,581)	(74,761)	(68,581)	(74,761)
Amounts recognized in the balance sheet consist of:
Prepaid postretirement benefit obligation	0	0	0	0
Prepaid pension	12,546	10,663	12,546	10,663
Prepaid (accrued) employee benefits	(2,960)	(2,822)	(2,960)	(2,822)
Accumulated postretirement benefit obligation		0		0
Pension liability	(78,167)	(82,602)	(78,167)	(82,602)
Accrued benefit liability, net	(68,581)	(74,761)	(68,581)	(74,761)
Amount recognized in accumulated comprehensive income (before taxes):
Prior service cost (credit)	18,806	17,301	18,806	17,301
Plans with accumulated benefit obligation in excess of plan assets:
Projected benefit obligation	1,370,088	872,933	1,370,088	872,933
Accumulated benefit obligation	1,299,983	871,892	1,299,983	871,892
Fair value of plan assets	1,290,027	787,514	1,290,027	787,514
Plans with plan assets in excess of accumulated benefit obligation:
Projected benefit obligation	21,584	19,974	21,584	19,974
Accumulated benefit obligation	21,584	19,974	21,584	19,974
Fair value of plan assets	33,063	30,638	33,063	30,638
Other Benefits
Change in benefit obligation:
Benefit obligation at beginning of period			43,076	43,316
Service cost			1,990	384	338
Interest cost			3,948	2,012	2,139
Plan participants' contributions			473	396
Amendments			0	0
Acquisitions			61,915	0
Settlements			(4,860)	0
Actuarial loss (gain)			2,307	835
Foreign currency exchange rate changes			435	(1,054)
Benefits paid			(4,313)	(2,813)
Benefit obligation at end of period	104,971	43,076	104,971	43,076	43,316
Change in plan assets:
Fair value of plan assets at beginning of period			47,506	47,453
Actual return on plan assets			2,498	1,661
Plan participants' contributions			237	121
Company contributions			5,617	1,048
Settlements			(4,860)	0
Acquisitions			0	0
Foreign currency exchange rate changes			(131)	0
Benefits paid			(4,399)	(2,777)
Fair value of plan assets at the end of period	46,468	47,506	46,468	47,506	$ 47,453
Funded status	(58,503)	4,430	(58,503)	4,430
Amounts recognized in the balance sheet consist of:
Prepaid postretirement benefit obligation	19,629	22,880	19,629	22,880
Prepaid pension	0	0	0	0
Prepaid (accrued) employee benefits	328	(1,935)	328	(1,935)
Accumulated postretirement benefit obligation	(78,460)	(16,515)	(78,460)	(16,515)
Pension liability		0		0
Accrued benefit liability, net	(58,503)	4,430	(58,503)	4,430
Amount recognized in accumulated comprehensive income (before taxes):
Prior service cost (credit)	2,578	2,666	2,578	2,666
Plans with accumulated benefit obligation in excess of plan assets:
Accumulated benefit obligation	77,034	16,658	77,034	16,658
Fair value of plan assets	0	107	0	107
Plans with plan assets in excess of accumulated benefit obligation:
Accumulated benefit obligation	27,937	26,418	27,937	26,418
Fair value of plan assets	$ 46,468	$ 47,399	$ 46,468	$ 47,399

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Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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