Employee benefit plans - Schedule of Defined Contribution Plans (Details) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
|
| Defined Contribution Plan Disclosure [Line Items] | ||
| Defined contribution plans, contributed amount | $ 40,741 | $ 36,934 |
| India | ||
| Defined Contribution Plan Disclosure [Line Items] | ||
| Defined contribution plans, contributed amount | 15,124 | 14,342 |
| U.S. | ||
| Defined Contribution Plan Disclosure [Line Items] | ||
| Defined contribution plans, contributed amount | 5,701 | 5,518 |
| U.K. | ||
| Defined Contribution Plan Disclosure [Line Items] | ||
| Defined contribution plans, contributed amount | 7,447 | 4,583 |
| China | ||
| Defined Contribution Plan Disclosure [Line Items] | ||
| Defined contribution plans, contributed amount | 7,488 | 7,398 |
| Other Regions | ||
| Defined Contribution Plan Disclosure [Line Items] | ||
| Defined contribution plans, contributed amount | $ 4,981 | $ 5,093 |