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Postretirement Benefit Plans - Defined Contribution Plans - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Contribution Plan Disclosure [Line Items]
Supplemental plan liability balances	$ 1,853	$ 1,819
Defined contribution plan expense	$ 14,142	12,030	$ 11,799
Percentage of union and non-union employees eligible for either statutory or Company's sponsored profit sharing contributions	79.00%
Percentage of us based union and non-union employees eligible for either statutory or Company's sponsored profit sharing contributions	100.00%
Statutory Plans [Member]
Defined Contribution Plan Disclosure [Line Items]
Defined contribution plan expense	$ 1,679	935	$ 374
Defined Contribution Plans [Member]
Defined Contribution Plan Disclosure [Line Items]
Balance of trust assets	$ 1,778	$ 1,744

X

- Definition

Balance of the trust assets.

+ References

No definition available.

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X

- Definition

Percentage of US based union and non union employees eligible for either Statutory or companys sponsored profit sharing contributions.

+ References

No definition available.

+ Details

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X

- Definition

Percentage of union and non-union employees eligible for either statutory or Company's sponsored profit sharing contributions.

+ References

No definition available.

+ Details

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X

- Definition

Supplemental executive retirement plan liability.

+ References

No definition available.

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X

- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

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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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