Retirement Plans and Other Postretirement Benefits - Weighted-Average Assumptions Used to Determine Benefit Obligations (Detail)	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Assumed long-term rate of investment return	6.50%
Retirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Assumed discount rate	5.00%	5.20%
Assumed discount rate	5.20%	2.80%
Assumed long-term rate of investment return	6.50%	6.50%
Assumed cash balance interest crediting rate	4.80%	2.60%
Retirement Plans [Member] \| Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Assumed salary increase rate	3.00%	3.00%
Assumed salary increase rate	3.00%	3.00%
Retirement Plans [Member] \| Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Assumed salary increase rate	6.00%	6.00%
Assumed salary increase rate	6.00%	6.00%
Other Post Retirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Assumed discount rate	5.00%	5.20%
Assumed salary increase rate	0.00%	0.00%
Assumed discount rate	5.20%	2.80%
Assumed long-term rate of investment return	0.00%	0.00%
Assumed salary increase rate	0.00%	0.00%
Assumed cash balance interest crediting rate	0.00%	0.00%

Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (k)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

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- Definition

Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (k)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

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- Definition

Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan.

+ References

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- Definition

Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-8

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (k)(3)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

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- Definition

Weighted average rate of compensation increase used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan.

+ References

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- Definition

Weighted-average interest crediting rate used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, cash balance and other defined benefit plans with promised interest crediting rate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (k)(4)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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