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Revenue Recognition - Schedule of Revenue Disaggregated by Line of Business (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) segment | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | segment |  |  |  |  |  |  |  |  | 3 |  |
Guarantee period |  |  |  |  |  |  |  |  | 90 days |  |
Service revenues | $ 1,304,086 | $ 1,189,897 | $ 1,108,326 | $ 1,506,691 | $ 1,537,385 | $ 1,552,132 | $ 1,516,385 | $ 1,468,530 | $ 5,109,000 | $ 6,074,432 | $ 5,800,271
Elimination of intersegment revenues |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Service revenues |  |  |  |  |  |  |  |  | (239,996) | (172,439) | (132,381)
Accountemps |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Service revenues |  |  |  |  |  |  |  |  | 1,558,024 | 1,985,221 | 1,941,544
OfficeTeam |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Service revenues |  |  |  |  |  |  |  |  | 764,947 | 1,040,755 | 1,065,427
Robert Half Technology |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Service revenues |  |  |  |  |  |  |  |  | 695,418 | 765,831 | 717,166
Robert Half Management Resources |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Service revenues |  |  |  |  |  |  |  |  | 698,942 | 792,757 | 738,810
Temporary and consultant staffing |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Service revenues |  |  |  |  |  |  |  |  | 3,477,335 | 4,412,125 | 4,330,566
Permanent placement staffing |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Service revenues |  |  |  |  |  |  |  |  | 370,109 | 533,432 | 511,989
Risk consulting and internal audit services |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Service revenues |  |  |  |  |  |  |  |  | $ 1,261,556 | $ 1,128,875 | $ 957,716

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