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Operating leases - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Lessee, Lease, Description [Line Items]        
Total lease cost $ 11,896 $ 18,593 $ 40,078 $ 33,500
Early termination options reasonably certain to be exercised 0 0 0 4,200
Right-of-use assets obtained in exchange for lease obligations $ 1,700 $ 1,100 $ 37,600 $ 4,900
Weighted average remaining lease term 6 years 9 months 7 days   6 years 9 months 7 days  
Weighted average discount rate 2.48%   2.48%  
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 $ 42,200 $ 61,900 $ 42,200 $ 61,900
Selling, general and administration costs        
Lessee, Lease, Description [Line Items]        
Total lease cost     38,100 31,900
Direct costs        
Lessee, Lease, Description [Line Items]        
Total lease cost     $ 2,000 $ 1,600