Net Revenues - Schedule of net revenues disaggregated by customer (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Segment Reporting Information [Line Items]
Net revenues	$ 1,254,418	$ 1,176,212	$ 2,469,344	$ 2,307,449
Data-Tech-AI
Segment Reporting Information [Line Items]
Net revenues	599,265	546,043	1,181,213	1,069,878
Digital Operations
Segment Reporting Information [Line Items]
Net revenues	655,153	630,169	1,288,131	1,237,571
Advanced Technology Solutions
Segment Reporting Information [Line Items]
Net revenues	292,655	249,462	570,282	489,311
Core Business Services
Segment Reporting Information [Line Items]
Net revenues	$ 961,763	$ 926,750	$ 1,899,062	$ 1,818,138

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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+ Details