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Postretirement Benefit Plans - Defined Contribution Plans - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
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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 |

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- Definition Balance of the trust assets. + References No definition available. + Details
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Balance Type: | debit
Period Type: | instant

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- 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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- 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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- Definition Supplemental executive retirement plan liability. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- 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 + Details
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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. + Details
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- Details
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- Details
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