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Operating leases - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Lessee, Lease, Description [Line Items]      
Total lease cost $ 12,827 $ 12,593  
Right-of-use assets obtained in exchange for lease obligations $ 35,600 $ 12,300  
Weighted average remaining lease term 7 years 2 months 1 day   6 years 8 months 19 days
Weighted average discount rate 3.73%   3.29%
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Other Liabilities Other Liabilities  
Other liabilities      
Lessee, Lease, Description [Line Items]      
Operating lease liabilities $ 36,100 $ 36,400  
Selling, general and administration costs      
Lessee, Lease, Description [Line Items]      
Total lease cost 10,000 10,000  
Direct costs      
Lessee, Lease, Description [Line Items]      
Total lease cost $ 2,800 $ 2,600