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, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Total	$ 137,985	$ 136,744	$ 178,574
Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	65,732	72,195
Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	72,253	64,549
Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	8,196	7,531
Cash and Cash Equivalents [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	8,196	7,531
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	27,258	49,037
Equity Securities [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	27,258	49,037
U.S. Equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	14,942	21,279
U.S. Equities [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	14,942	21,279
Non-U.S. Equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total		9,788
Non-U.S. Equities [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	0	9,788
Employer Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	12,316	17,970
Employer Securities [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	12,316	17,970
Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	102,531	80,176
Fixed Income Securities [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	30,278	15,627
Fixed Income Securities [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	72,253	64,549
U.S. Corporate Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	57,595	51,444
U.S. Corporate Bonds [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	57,595	51,444
U.S. Government and Agency Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	33,811	18,255
U.S. Government and Agency Bonds [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	30,278	15,627
U.S. Government and Agency Bonds [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	3,533	2,628
Other Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	11,125	10,477
Other Bonds [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	$ 11,125	$ 10,477