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Business Segments - Reconciliation of Revenue and Operating Income by Reportable Segment (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Segment Reporting Information [Line Items] |  |
Service revenues | $ 1,716,335 | $ 1,814,834
Segment income | 164,794 | 227,651
Amortization of intangible assets | 721 | 417
Interest income, net | (4,825) | (166)
Income before income taxes | 168,898 | 227,400
Contract talent solutions |  |
Segment Reporting Information [Line Items] |  |
Service revenues | 1,065,474 | 1,155,723
Segment income | 102,146 | 133,246
Permanent placement talent solutions |  |
Segment Reporting Information [Line Items] |  |
Service revenues | 156,737 | 186,782
Segment income | 23,827 | 37,328
Protiviti |  |
Segment Reporting Information [Line Items] |  |
Service revenues | 494,124 | 472,329
Segment income | $ 38,821 | $ 57,077

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