Disaggregation of Revenue - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Revenue	$ 1,531,756	$ 1,710,765	$ 1,579,922
Flex revenue
Disaggregation of Revenue [Line Items]
Revenue	1,493,774	1,652,450	1,530,157
Direct Hire revenue
Disaggregation of Revenue [Line Items]
Revenue	37,982	58,315	49,765
Technology
Disaggregation of Revenue [Line Items]
Revenue	1,384,553	1,507,627	1,273,941
Technology | Flex revenue
Disaggregation of Revenue [Line Items]
Revenue	1,366,095	1,476,055	1,247,560
Technology | Direct Hire revenue
Disaggregation of Revenue [Line Items]
Revenue	18,458	31,572	26,381
FA
Disaggregation of Revenue [Line Items]
Revenue	147,203	203,138	305,981
FA | Flex revenue
Disaggregation of Revenue [Line Items]
Revenue	127,679	176,395	282,597
FA | Direct Hire revenue
Disaggregation of Revenue [Line Items]
Revenue	$ 19,524	$ 26,743	$ 23,384