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Employee benefit plans - Schedule of Defined Contribution Plans (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
Defined contribution plans, contributed amount | $ 38,861 | $ 34,722 | $ 112,625 | $ 106,212
India |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
Defined contribution plans, contributed amount | 15,623 | 14,029 | 45,499 | 40,517
U.S. |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
Defined contribution plans, contributed amount | 4,463 | 4,664 | 14,564 | 15,815
U.K. |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
Defined contribution plans, contributed amount | 5,808 | 4,227 | 14,873 | 14,246
China |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
Defined contribution plans, contributed amount | 7,221 | 7,315 | 21,991 | 21,625
Other Regions |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
Defined contribution plans, contributed amount | $ 5,746 | $ 4,487 | $ 15,698 | $ 14,009

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