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Revenue Recognition - Schedule of Revenue Disaggregated by Line of Business (Details) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 USD ($) segment | Mar. 31, 2019 USD ($)
Disaggregation of Revenue [Line Items] |  |
Number of reportable segments | segment | 3 |
Guarantee period | 90 days |
Service revenues | $ 1,506,691 | $ 1,468,530
Accountemps |  |
Disaggregation of Revenue [Line Items] |  |
Service revenues | 480,441 | 483,473
OfficeTeam |  |
Disaggregation of Revenue [Line Items] |  |
Service revenues | 239,036 | 252,035
Robert Half Technology |  |
Disaggregation of Revenue [Line Items] |  |
Service revenues | 183,423 | 171,928
Robert Half Management Resources |  |
Disaggregation of Revenue [Line Items] |  |
Service revenues | 189,220 | 177,191
Temporary and consulting staffing |  |
Disaggregation of Revenue [Line Items] |  |
Service revenues | 1,092,120 | 1,084,627
Permanent placement staffing |  |
Disaggregation of Revenue [Line Items] |  |
Service revenues | 120,489 | 131,562
Risk consulting and internal audit services |  |
Disaggregation of Revenue [Line Items] |  |
Service revenues | $ 294,082 | $ 252,341

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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 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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