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, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Total	$ 126,888	$ 137,985	$ 136,744
Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	70,708	65,732
Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	56,180	72,253
Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	8,416	8,196
Cash and Cash Equivalents [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	8,416	8,196
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	23,503	27,258
Equity Securities [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	23,503	27,258
U.S. Equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	16,010	14,942
U.S. Equities [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	16,010	14,942
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	7,493	12,316
Employer Securities [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	7,493	12,316
Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	94,969	102,531
Fixed Income Securities [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	38,789	30,278
Fixed Income Securities [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	56,180	72,253
U.S. Corporate Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	46,114	57,595
U.S. Corporate Bonds [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	46,114	57,595
U.S. Government and Agency Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	42,007	33,811
U.S. Government and Agency Bonds [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	38,789	30,278
U.S. Government and Agency Bonds [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	3,218	3,533
Other Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	6,848	11,125
Other Bonds [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	$ 6,848	$ 11,125