REVENUE RECOGNITION (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]
Revenue from services	$ 753,561	$ 331,827	$ 1,542,293	$ 661,068
Temporary Staffing Services
Disaggregation of Revenue [Line Items]
Revenue from services	733,297	323,591	1,504,848	644,972
Other Services
Disaggregation of Revenue [Line Items]
Revenue from services	20,264	8,236	37,445	16,096
Nurse And Allied Staffing
Disaggregation of Revenue [Line Items]
Revenue from services	731,443	316,188	1,497,023	629,196
Nurse And Allied Staffing | Temporary Staffing Services
Disaggregation of Revenue [Line Items]
Revenue from services	712,090	308,519	1,461,537	614,494
Nurse And Allied Staffing | Other Services
Disaggregation of Revenue [Line Items]
Revenue from services	19,353	7,669	35,486	14,702
Physician Staffing
Disaggregation of Revenue [Line Items]
Revenue from services	22,118	15,639	45,270	31,872
Physician Staffing | Temporary Staffing Services
Disaggregation of Revenue [Line Items]
Revenue from services	21,207	15,072	43,311	30,478
Physician Staffing | Other Services
Disaggregation of Revenue [Line Items]
Revenue from services	$ 911	$ 567	$ 1,959	$ 1,394