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Operating leases - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Lessee, Lease, Description [Line Items] |  |  |  |
Total lease cost | $ 13,245 | $ 7,329 | $ 28,182 | $ 14,907
Early termination options reasonably certain to be exercised | 0 | 0 | 0 | 4,200
Right-of-use assets obtained in exchange for lease obligations | $ 29,000 | $ 1,000 | $ 35,800 | $ 3,800
Weighted average remaining lease term | 6 years 9 months 25 days |  | 6 years 9 months 25 days |
Weighted average discount rate | 2.65% |  | 2.65% |
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] | Other Liabilities | Other Liabilities | Other Liabilities | Other Liabilities
Other liabilities |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Operating lease liabilities | $ 47,000 | $ 22,800 | $ 47,000 | $ 22,800
Selling, general and administration costs |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Total lease cost |  |  | 27,100 | 13,800
Direct costs |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Total lease cost |  |  | $ 1,100 | $ 1,100

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- Definition Amount of lease cost recognized by lessee for lease contract. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI https://asc.fasb.org/extlink&oid=123414884&loc=SL77918982-209971 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + Details
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- Definition Weighted average discount rate for operating lease calculated at point in time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(4) -URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI https://asc.fasb.org/extlink&oid=123414884&loc=SL77918982-209971 + Details
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- Definition Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI https://asc.fasb.org/extlink&oid=123414884&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(3) -URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918686-209980 + Details
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