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Contingencies - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Site Contingency [Line Items]
Environmental losses accrual	$ 22,884,000	$ 25,905,000
Cash expenditures related to legal and environmental matters	$ 4,483,000	$ 3,791,000
Contribution for future response costs	5.00%
Wilmington Site [Member]
Site Contingency [Line Items]
Payment of environmental response costs	$ 2,965,000
Minimum [Member]
Site Contingency [Line Items]
Environmental and legal losses	22,884,000
Maximum [Member]
Site Contingency [Line Items]
Environmental and legal losses	$ 41,104,000

X

- Definition

Life to date payments for environmental remediation response activities.

+ References

No definition available.

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- Definition

Site contingency maximum future response cost percentage.

+ References

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- Definition

Amount of loss contingency liability.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349

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- Definition

Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
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-Publisher FASB
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-Topic 460
-SubTopic 10
-Section 50
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- Definition

The amount of cash paid for the settlement of litigation or for other legal issues during the period.

+ References

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-SubTopic 10
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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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