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Disaggregation of Revenue - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenue | $ 345,558 | $ 326,584 | $ 1,011,157 | $ 973,560
Flex revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenue | 333,652 | 316,102 | 973,987 | 939,147
Direct Hire revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenue | 11,906 | 10,482 | 37,170 | 34,413
Tech |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenue | 271,999 | 251,079 | 792,947 | 737,339
Tech | Flex revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenue | 267,304 | 247,154 | 777,227 | 723,159
Tech | Direct Hire revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenue | 4,695 | 3,925 | 15,720 | 14,180
FA |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenue | 73,559 | 75,505 | 218,210 | 236,221
FA | Flex revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenue | 66,348 | 68,948 | 196,760 | 215,988
FA | Direct Hire revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenue | $ 7,211 | $ 6,557 | $ 21,450 | $ 20,233

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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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