Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Disaggregation of Revenue [Line Items]
Total Revenue	$ 416,967	$ 363,225
Flex revenue
Disaggregation of Revenue [Line Items]
Total Revenue	401,866	353,847
Direct Hire revenue
Disaggregation of Revenue [Line Items]
Total Revenue	15,101	9,378
Technology
Disaggregation of Revenue [Line Items]
Total Revenue	359,905	279,560
Technology | Flex revenue
Disaggregation of Revenue [Line Items]
Total Revenue	351,716	274,784
Technology | Direct Hire revenue
Disaggregation of Revenue [Line Items]
Total Revenue	8,189	4,776
FA
Disaggregation of Revenue [Line Items]
Total Revenue	57,062	83,665
FA | Flex revenue
Disaggregation of Revenue [Line Items]
Total Revenue	50,150	79,063
FA | Direct Hire revenue
Disaggregation of Revenue [Line Items]
Total Revenue	$ 6,912	$ 4,602