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Pensions and Other Post-retirement Benefits - Schedule of Defined Benefit Pension Plans and Other Postretirement Benefits Plan (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Funded Status |  |  |
Noncurrent assets | $ 97,545 | $ 75,066 |
Noncurrent liabilities | (208,068) | (186,697) |
Pension Benefits |  |  |
Change in Benefit Obligations |  |  |
Benefit obligations at January 1 | 603,551 | 525,520 |
Service cost | 12,094 | 10,342 | $ 11,125
Interest cost | 14,905 | 18,803 | 17,214
Participant contributions | 396 | 470 |
Plan amendments | (430) | 0 |
Actuarial losses(a) | 54,606 | 81,132 |
Benefits paid | (24,496) | (24,452) |
Curtailments | 1,559 | 0 |
Settlements | (506) | (7,265) |
Currency translation | 12,296 | (999) |
Benefit obligations at December 31 | 670,857 | 603,551 | 525,520
Change in Plan Assets |  |  |
Fair value of plan assets at January 1 | 515,858 | 443,112 |
Actual return on plan assets | 87,769 | 98,210 |
Employer contributions | 5,596 | 5,537 |
Participant contributions | 396 | 470 |
Settlements | (506) | (7,265) |
Benefits paid | 24,496 | 24,452 |
Administrative expenses paid | (172) | (297) |
Currency translation | 2,377 | 543 |
Fair value of plan assets at December 31 | 586,822 | 515,858 | 443,112
Funded Status |  |  |
Funded status at December 31 | (84,035) | (87,693) |
Unrecognized transition losses | 4 | 4 |
Unrecognized prior service credit | 1,717 | 1,572 |
Unrecognized net actuarial losses | 169,028 | 183,733 |
Net amount recognized | 86,714 | 97,616 |
Noncurrent assets | 97,545 | 75,066 |
Current liabilities | (6,600) | (5,944) |
Noncurrent liabilities | (174,980) | (156,815) |
Net amount recognized | (84,035) | (87,693) |
Amounts Recognized in Accumulated Other Comprehensive Loss |  |  |
Net actuarial losses | 169,028 | 183,733 |
Prior service cost (credit) | 1,717 | 1,572 |
Unrecognized net initial obligation | 4 | 4 |
Total (before tax effects) | 170,749 | 185,309 |
Accumulated Benefit Obligations for all Defined Benefit Plans | 619,167 | 558,183 |
Other Benefits |  |  |
Change in Benefit Obligations |  |  |
Benefit obligations at January 1 | 28,151 | 28,477 |
Service cost | 396 | 354 | 369
Interest cost | 716 | 996 | 793
Participant contributions | 370 | 380 |
Plan amendments | 0 | 0 |
Actuarial losses(a) | 5,284 | 1,319 |
Benefits paid | (2,692) | (3,375) |
Curtailments | 0 | 0 |
Settlements | 0 | 0 |
Currency translation | 0 | 0 |
Benefit obligations at December 31 | 32,225 | 28,151 | 28,477
Change in Plan Assets |  |  |
Fair value of plan assets at January 1 | 0 | 0 |
Actual return on plan assets | 0 | 0 |
Employer contributions | 2,322 | 2,995 |
Participant contributions | 370 | 380 |
Settlements | 0 | 0 |
Benefits paid | 2,692 | 3,375 |
Administrative expenses paid | 0 | 0 |
Currency translation | 0 | 0 |
Fair value of plan assets at December 31 | 0 | 0 | $ 0
Funded Status |  |  |
Funded status at December 31 | (32,225) | (28,151) |
Unrecognized transition losses | 0 | 0 |
Unrecognized prior service credit | (1,125) | (1,519) |
Unrecognized net actuarial losses | 16,686 | 12,547 |
Net amount recognized | (16,664) | (17,123) |
Noncurrent assets | 0 | 0 |
Current liabilities | (2,849) | (2,406) |
Noncurrent liabilities | (29,376) | (25,745) |
Net amount recognized | (32,225) | (28,151) |
Amounts Recognized in Accumulated Other Comprehensive Loss |  |  |
Net actuarial losses | 16,686 | 12,547 |
Prior service cost (credit) | (1,125) | (1,519) |
Unrecognized net initial obligation | 0 | 0 |
Total (before tax effects) | 15,561 | 11,028 |
Accumulated Benefit Obligations for all Defined Benefit Plans | $ 0 | $ 0 |

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- Definition Amount of payment to participant under defined benefit plan which decreases plan assets. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of contributions received by defined benefit plan from participant which increases plan assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of foreign currency translation gain (loss) which increases (decreases) plan assets of defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of (increase) decrease to benefit obligation of defined benefit plan from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Includes, but is not limited to, lump-sum cash payment to participant in exchange for right to receive specified benefits, purchase of nonparticipating annuity contract and change from remeasurement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(10) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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