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Business Segments - Schedule of Reconciliation of Revenue and Operating Income by Reportable Segment to Consolidated Results (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Segment Reporting Information [Line Items] |  |
Service revenues | $ 1,475,937 | $ 1,716,335
Segment income | 84,578 | 164,794
Amortization of intangible assets | 304 | 721
Interest income, net | (6,413) | (4,825)
Income before income taxes | 90,687 | 168,898
Contract talent solutions |  |
Segment Reporting Information [Line Items] |  |
Service revenues | 887,058 | 1,065,474
Segment income | 50,118 | 102,146
Permanent placement talent solutions |  |
Segment Reporting Information [Line Items] |  |
Service revenues | 124,767 | 156,737
Segment income | 11,855 | 23,827
Protiviti |  |
Segment Reporting Information [Line Items] |  |
Service revenues | 464,112 | 494,124
Segment income | $ 22,605 | $ 38,821

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