Disaggregation of Revenue - Schedule of Disaggregation of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Total Revenue	$ 373,122	$ 437,620	$ 1,168,309	$ 1,291,103
Flex revenue
Disaggregation of Revenue [Line Items]
Total Revenue	364,161	422,968	1,138,163	1,244,533
Direct Hire revenue
Disaggregation of Revenue [Line Items]
Total Revenue	8,961	14,652	30,146	46,570
Technology
Disaggregation of Revenue [Line Items]
Total Revenue	338,289	390,496	1,055,158	1,134,996
Technology | Flex revenue
Disaggregation of Revenue [Line Items]
Total Revenue	334,253	382,072	1,040,103	1,109,294
Technology | Direct Hire revenue
Disaggregation of Revenue [Line Items]
Total Revenue	4,036	8,424	15,055	25,702
FA
Disaggregation of Revenue [Line Items]
Total Revenue	34,833	47,124	113,151	156,107
FA | Flex revenue
Disaggregation of Revenue [Line Items]
Total Revenue	29,908	40,896	98,060	135,239
FA | Direct Hire revenue
Disaggregation of Revenue [Line Items]
Total Revenue	$ 4,925	$ 6,228	$ 15,091	$ 20,868