Postretirement Benefit Plans - Company's Asset Allocations for its U.S. Pension Plans by Asset Category (Detail) - United States [Member] - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]
Total	$ 125,216	$ 126,888	$ 137,985
Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	57,240	70,708
Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	67,976	56,180
Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	12,735	8,416
Cash and Cash Equivalents [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	12,735	8,416
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	20,530	23,503
Equity Securities [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	20,530	23,503
U.S. Equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	16,256	16,010
U.S. Equities [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	16,256	16,010
Non-U.S. Equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total		0
Non-U.S. Equities [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total		0
Employer Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	4,274	7,493
Employer Securities [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	4,274	7,493
Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	91,951	94,969
Fixed Income Securities [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	23,975	38,789
Fixed Income Securities [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	67,976	56,180
U.S. Corporate Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	62,029	46,114
U.S. Corporate Bonds [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	62,029	46,114
U.S. Government and Agency Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	24,913	42,007
U.S. Government and Agency Bonds [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	23,975	38,789
U.S. Government and Agency Bonds [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	938	3,218
Other Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	5,009	6,848
Other Bonds [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	$ 5,009	$ 6,848