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Pension Plans - Weighted-Average Asset Allocations of Plan Assets (Detail)	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocations of pension plan assets	100.00%	100.00%
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocations of pension plan assets	47.00%	48.00%
Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocations of pension plan assets	53.00%	51.00%
Cash and Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocations of pension plan assets	0.00%	1.00%

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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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- Definition

Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

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