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Retirement Plans and Other Postretirement Benefits - Accumulated Benefit Obligation ("ABO") (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
U.S. Defined Benefit Pension Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accumulated benefit obligation | $ 520,161 | $ 498,969
U.S. Defined Benefit Pension Plans | Funded plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accumulated benefit obligation | 515,667 | 493,756
U.S. Defined Benefit Pension Plans | Unfunded plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accumulated benefit obligation | 4,494 | 5,213
Foreign Defined Benefit Pension Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accumulated benefit obligation | 349,088 | 309,990
Foreign Defined Benefit Pension Plans | Funded plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accumulated benefit obligation | 295,998 | 264,675
Foreign Defined Benefit Pension Plans | Unfunded plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accumulated benefit obligation | $ 53,090 | $ 45,315

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + 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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- Details
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