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Revenue Recognition - Schedule of Revenue Disaggregated by Line of Business (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2022 USD ($) segment | Sep. 30, 2021 USD ($)
Revenue from Contract with Customer [Abstract] |  |  |  |
Number of reportable segments | segment |  |  | 3 |
Guarantee period |  |  | 90 days |
Disaggregation of Revenue [Line Items] |  |  |  |
Service revenues | $ 1,833,455 | $ 1,712,566 | $ 5,511,116 | $ 4,691,527
Elimination of intersegment revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Service revenues | (132,745) | (172,534) | (414,493) | (419,375)
Finance and accounting |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Service revenues | 805,229 | 732,365 | 2,417,829 | 1,996,692
Administrative and customer support |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Service revenues | 250,531 | 279,370 | 809,578 | 763,035
Technology |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Service revenues | 216,735 | 215,500 | 648,252 | 581,905
Total contract talent solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Service revenues | 1,139,750 | 1,054,701 | 3,461,166 | 2,922,257
Permanent placement talent solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Service revenues | 182,329 | 156,444 | 569,207 | 411,788
Protiviti |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Service revenues | $ 511,376 | $ 501,421 | $ 1,480,743 | $ 1,357,482

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9031-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9038-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130543-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9054-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130545-203045 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI https://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 + Details
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