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Revenue Recognition - Schedule of Revenue Disaggregated by Functional Specialization and Segments (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 USD ($) segment | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Revenue from Contract with Customer [Abstract] |  |  |
Number of reportable segments | segment | 3 |  |
Guarantee period | 90 days |  |
Disaggregation of Revenue [Line Items] |  |  |
Service revenues | $ 5,795,837 | $ 6,392,517 | $ 7,238,142
Contract Talent Solutions |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Service revenues | 3,357,872 | 3,895,332 | 4,532,847
Contract Talent Solutions | Elimination Of Intersegment Revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Service revenues | (471,777) | (442,326) | (552,231)
Contract Talent Solutions | Finance and accounting |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Service revenues | 2,454,119 | 2,811,093 | 3,185,183
Contract Talent Solutions | Administration and customer support |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Service revenues | 741,468 | 816,409 | 1,042,634
Contract Talent Solutions | Technology |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Service revenues | 634,062 | 710,156 | 857,261
Permanent Placement Talent Solutions |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Service revenues | 487,204 | 567,486 | 725,155
Protiviti |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Service revenues | $ 1,950,761 | $ 1,929,699 | $ 1,980,140

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