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Pension Plans and Postretirement Benefits - Obligations and Funded Status (Detail) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 31, 2018 | Jul. 31, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Change in benefit obligation: |  |  |  |  |  |  |
Service cost |  |  |  |  | $ 11,300 | $ 9,700 | $ 10,200
Actuarial loss (gain) |  |  | $ 6,400 | $ 3,600 |  |  |
Change in plan assets: |  |  |  |  |  |  |
Fair value of plan assets at beginning of period |  |  |  |  | 1,198,816 |  |
Company contributions |  |  |  |  | 5,131 |  |
Fair value of plan assets at the end of period |  |  | 1,333,309 | 1,198,816 | 1,333,309 | 1,198,816 |
Amounts recognized in the balance sheet consist of: |  |  |  |  |  |  |
Accumulated postretirement benefit obligation |  |  | (25,689) | (23,259) | (25,689) | (23,259) |
Pension liability |  |  | (144,859) | (172,508) | (144,859) | (172,508) |
Pension Plan |  |  |  |  |  |  |
Change in benefit obligation: |  |  |  |  |  |  |
Benefit obligation at beginning of period |  |  |  |  | 1,308,798 | 1,186,186 |
Service cost |  |  |  |  | 10,650 | 9,123 | 9,593
Interest cost |  |  |  |  | 37,199 | 46,307 | 47,496
Plan participants' contributions |  |  |  |  | 180 | 321 |
Amendments |  |  |  |  | 2,333 | 5,523 |
Settlements |  | $ (240,000) |  |  | (7,041) | (25,694) |
Actuarial loss (gain) |  |  |  |  | 120,126 | 139,909 |
Foreign currency exchange rate changes |  |  |  |  | 3,513 | 6,027 |
Benefits paid |  |  |  |  | (61,703) | (58,904) |
Benefit obligation at end of period |  |  | 1,414,055 | 1,308,798 | 1,414,055 | 1,308,798 | 1,186,186
Change in plan assets: |  |  |  |  |  |  |
Fair value of plan assets at beginning of period |  |  |  |  | 1,150,495 | 1,024,091 |
Actual return on plan assets |  |  |  |  | 190,862 | 195,846 |
Plan participants' contributions |  |  |  |  | 180 | 321 |
Company contributions | $ 118,100 |  |  |  |  | 4,284 | 159,000
Settlements |  |  |  |  | (7,041) | (21,191) |
Foreign currency exchange rate changes |  |  |  |  | 3,308 | 6,048 |
Benefits paid |  |  |  |  | (61,703) | (58,904) |
Fair value of plan assets at the end of period |  |  | 1,281,232 | 1,150,495 | 1,281,232 | 1,150,495 | 1,024,091
Funded status |  |  | (132,823) | (158,303) | (132,823) | (158,303) |
Amounts recognized in the balance sheet consist of: |  |  |  |  |  |  |
Prepaid pension |  |  | 14,588 | 16,936 | 14,588 | 16,936 |
Accrued employee benefits |  |  | (3,082) | (3,218) | (3,082) | (3,218) |
Accumulated postretirement benefit obligation |  |  | 0 | 0 | 0 | 0 |
Pension liability |  |  | (144,329) | (172,021) | (144,329) | (172,021) |
Accrued benefit liability, net |  |  | (132,823) | (158,303) | (132,823) | (158,303) |
Amount recognized in accumulated comprehensive income (before taxes): |  |  |  |  |  |  |
Prior service cost (credit) |  |  | 21,319 | 22,356 | 21,319 | 22,356 |
Plans with accumulated benefit obligation in excess of plan assets: |  |  |  |  |  |  |
Projected benefit obligation |  |  | 1,264,764 | 1,167,257 | 1,264,764 | 1,167,257 |
Accumulated benefit obligation |  |  | 1,255,899 | 1,153,811 | 1,255,899 | 1,153,811 |
Fair value of plan assets |  |  | 1,117,353 | 992,018 | 1,117,353 | 992,018 |
Plans with plan assets in excess of accumulated benefit obligation: |  |  |  |  |  |  |
Projected benefit obligation |  |  | 149,291 | 141,541 | 149,291 | 141,541 |
Accumulated benefit obligation |  |  | 149,270 | 141,497 | 149,270 | 141,497 |
Fair value of plan assets |  |  | 163,879 | 158,477 | 163,879 | 158,477 |
Other Benefits |  |  |  |  |  |  |
Change in benefit obligation: |  |  |  |  |  |  |
Benefit obligation at beginning of period |  |  |  |  | 58,881 | 60,405 |
Service cost |  |  |  |  | 642 | 545 | 620
Interest cost |  |  |  |  | 1,612 | 2,254 | 2,121
Plan participants' contributions |  |  |  |  | 562 | 550 |
Amendments |  |  |  |  | 0 | 0 |
Settlements |  |  |  |  | 0 | 0 |
Actuarial loss (gain) |  |  |  |  | 2,219 | (2,427) |
Foreign currency exchange rate changes |  |  |  |  | 331 | 462 |
Benefits paid |  |  |  |  | (3,161) | (2,908) |
Benefit obligation at end of period |  |  | 61,086 | 58,881 | 61,086 | 58,881 | 60,405
Change in plan assets: |  |  |  |  |  |  |
Fair value of plan assets at beginning of period |  |  |  |  | 48,321 | 43,945 |
Actual return on plan assets |  |  |  |  | 5,293 | 5,688 |
Plan participants' contributions |  |  |  |  | 562 | 550 |
Company contributions |  |  |  |  | 992 | 915 |
Settlements |  |  |  |  | 0 | 0 |
Foreign currency exchange rate changes |  |  |  |  | 0 | 0 |
Benefits paid |  |  |  |  | (3,091) | (2,777) |
Fair value of plan assets at the end of period |  |  | 52,077 | 48,321 | 52,077 | 48,321 | $ 43,945
Funded status |  |  | (9,009) | (10,560) | (9,009) | (10,560) |
Amounts recognized in the balance sheet consist of: |  |  |  |  |  |  |
Prepaid pension |  |  | 18,069 | 14,012 | 18,069 | 14,012 |
Accrued employee benefits |  |  | (1,389) | (1,313) | (1,389) | (1,313) |
Accumulated postretirement benefit obligation |  |  | (25,689) | (23,259) | (25,689) | (23,259) |
Pension liability |  |  | 0 | 0 | 0 | 0 |
Accrued benefit liability, net |  |  | (9,009) | (10,560) | (9,009) | (10,560) |
Amount recognized in accumulated comprehensive income (before taxes): |  |  |  |  |  |  |
Prior service cost (credit) |  |  | (1,059) | (1,252) | (1,059) | (1,252) |
Plans with accumulated benefit obligation in excess of plan assets: |  |  |  |  |  |  |
Accumulated benefit obligation |  |  | 24,593 | 22,316 | 24,593 | 22,316 |
Fair value of plan assets |  |  | 0 | 0 | 0 | 0 |
Plans with plan assets in excess of accumulated benefit obligation: |  |  |  |  |  |  |
Accumulated benefit obligation |  |  | 36,493 | 36,565 | 36,493 | 36,565 |
Fair value of plan assets |  |  | $ 52,077 | $ 48,321 | $ 52,077 | $ 48,321 |

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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + 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 (j) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 + Details
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- Definition Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109237824&loc=d3e1703-114919 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: 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 + Details
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- Definition Amount of cost recognized for passage of time related to 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)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109237824&loc=SL108413299-114919 Reference 3: 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 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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- Definition Amount of accumulated benefit obligation for defined benefit plan with accumulated benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2417-114920 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 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2417-114920 + Details
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- Definition Amount of plan asset for defined benefit plan with accumulated benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2417-114920 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 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2417-114920 + Details
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- Definition Amount of projected benefit obligation for defined benefit pension plan with accumulated benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2417-114920 + Details
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- Definition Amount of increase (decrease) in benefit obligation of defined benefit plan from change in terms of existing plan or initiation of new 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 (a)(7) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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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://www.xbrl.org/2003/role/disclosureRef -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 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -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 + Details
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- Definition Amount of contributions received by defined benefit plan from participant which increases plan assets. + 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 (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://www.xbrl.org/2003/role/disclosureRef -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 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921 + Details
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