Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Total Revenue	$ 436,516	$ 403,614	$ 853,483	$ 766,839
Flex revenue
Disaggregation of Revenue [Line Items]
Total Revenue	419,700	391,362	821,566	745,209
Direct Hire revenue
Disaggregation of Revenue [Line Items]
Total Revenue	16,816	12,252	31,917	21,630
Technology
Disaggregation of Revenue [Line Items]
Total Revenue	384,595	310,728	744,500	590,288
Technology | Flex revenue
Disaggregation of Revenue [Line Items]
Total Revenue	375,507	304,645	727,223	579,429
Technology | Direct Hire revenue
Disaggregation of Revenue [Line Items]
Total Revenue	9,088	6,083	17,277	10,859
FA
Disaggregation of Revenue [Line Items]
Total Revenue	51,921	92,886	108,983	176,551
FA | Flex revenue
Disaggregation of Revenue [Line Items]
Total Revenue	44,193	86,717	94,343	165,780
FA | Direct Hire revenue
Disaggregation of Revenue [Line Items]
Total Revenue	$ 7,728	$ 6,169	$ 14,640	$ 10,771