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Operating leases - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Lessee, Lease, Description [Line Items]          
Total lease cost $ 11,923 $ 11,566 $ 33,736 $ 36,694  
Right-of-use assets obtained in exchange for lease obligations $ 13,300 2,100 $ 59,900 24,600  
Weighted average remaining lease term 6 years 8 months 19 days   6 years 8 months 19 days   6 years 8 months 19 days
Weighted average discount rate 3.79%   3.79%   3.29%
Operating lease liabilities, current $ 38,500   $ 38,500   $ 36,400
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Other Liabilities   Other Liabilities   Other Liabilities
Operating lease liabilities, non-current $ 145,714   $ 145,714   $ 126,321
Selling, general and administration costs          
Lessee, Lease, Description [Line Items]          
Total lease cost 10,600 8,800 28,600 28,100  
Direct costs          
Lessee, Lease, Description [Line Items]          
Total lease cost $ 1,300 $ 2,800 $ 5,100 $ 8,600