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Operating leases - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Lessee, Lease, Description [Line Items]    
Total lease cost $ 12,593 $ 14,937
Right-of-use assets obtained in exchange for lease obligations $ 12,300 $ 6,800
Weighted average remaining lease term 7 years 3 months  
Weighted average discount rate 2.60%  
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Other Liabilities Other Liabilities
Other liabilities    
Lessee, Lease, Description [Line Items]    
Operating lease liabilities $ 43,400 $ 48,600
Selling, general and administration costs    
Lessee, Lease, Description [Line Items]    
Total lease cost 10,000 14,300
Direct costs    
Lessee, Lease, Description [Line Items]    
Total lease cost $ 2,600 $ 600