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Pension and other post-retirement benefits - Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Change in plan assets |  |
Non-current assets (note 11) | $ 10,662 | $ 8,437
Pension Plans |  |
Change in projected benefit obligation |  |
Projected benefit obligation, beginning of year | 564,970 | 484,707
Projected benefit obligation assumed from business combination | 195,231 | 20,196
Modifications to plans | (191) | (7,705)
Service cost | 15,450 | 12,351
Interest cost | 19,281 | 20,222
Actuarial (gain) loss | 76,618 | 65,443
Contributions from retirees | 171 | 0
Medicare Part D | 0 | 0
Benefits paid | (37,020) | (30,244)
Foreign exchange | 403 | 0
Projected benefit obligation, end of year | 834,913 | 564,970
Change in plan assets |  |
Fair value of plan assets, beginning of year | 407,074 | 339,099
Plan assets acquired in business combination | 179,600 | 8,004
Actual return on plan assets | 52,876 | 68,025
Employer contributions | 26,099 | 22,190
Contributions from retirees | 171 | 0
Medicare Part D subsidy receipts | 0 | 0
Benefits paid | (37,020) | (30,244)
Foreign exchange | 357 | 0
Fair value of plan assets, end of year | 629,157 | 407,074
Unfunded status | (205,756) | (157,896)
Non-current assets (note 11) | 488 | 0
Current liabilities | (1,989) | (1,415)
Non-current liabilities | (204,255) | (156,481)
Net amount recognized | (205,756) | (157,896)
Other Postretirement Benefit Plans, Defined Benefit |  |
Change in projected benefit obligation |  |
Projected benefit obligation, beginning of year | 219,217 | 168,325
Projected benefit obligation assumed from business combination | 44,950 | 11,646
Modifications to plans | 0 | 0
Service cost | 6,175 | 4,587
Interest cost | 7,695 | 7,575
Actuarial (gain) loss | 34,507 | 33,605
Contributions from retirees | 2,037 | 1,913
Medicare Part D | 377 | 414
Benefits paid | (8,434) | (8,848)
Foreign exchange | 0 | 0
Projected benefit obligation, end of year | 306,524 | 219,217
Change in plan assets |  |
Fair value of plan assets, beginning of year | 158,873 | 115,542
Plan assets acquired in business combination | 0 | 15,688
Actual return on plan assets | 21,219 | 25,464
Employer contributions | 2,583 | 8,628
Contributions from retirees | 1,998 | 1,913
Medicare Part D subsidy receipts | 377 | 414
Benefits paid | (8,434) | (8,776)
Foreign exchange | 0 | 0
Fair value of plan assets, end of year | 176,616 | 158,873
Unfunded status | (129,908) | (60,344)
Non-current assets (note 11) | 10,174 | 8,437
Current liabilities | (2,835) | (1,168)
Non-current liabilities | (137,247) | (67,613)
Net amount recognized | $ (129,908) | $ (60,344)

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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + 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)(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 + 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 receipt from prescription drug subsidy which increases plan assets of defined benefit postretirement plan. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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 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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