GOODWILL, TRADE NAMES, AND OTHER INTANGIBLE ASSETS - Goodwill Rollforward (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2022 USD ($)
Goodwill [Roll Forward]
Aggregate goodwill acquired, beginning balance	$ 439,851
Accumulated impairment loss, beginning balance	(310,472)
Goodwill, net of impairment loss, beginning balance	119,490
Goodwill acquisition adjustment - Selected	(6,130)
Aggregate goodwill acquired, ending balance	433,721
Accumulated impairment loss, ending balance	(310,472)
Goodwill, net of impairment loss, ending balance	113,360
Sale of business
Goodwill [Roll Forward]
Aggregate goodwill acquired, beginning balance	9,889
Aggregate goodwill acquired, ending balance	9,889
Nurse And Allied Staffing
Goodwill [Roll Forward]
Aggregate goodwill acquired, beginning balance	396,446
Accumulated impairment loss, beginning balance	(269,874)
Goodwill, net of impairment loss, beginning balance	116,683
Goodwill acquisition adjustment - Selected	(6,130)
Aggregate goodwill acquired, ending balance	390,316
Accumulated impairment loss, ending balance	(269,874)
Goodwill, net of impairment loss, ending balance	110,553
Nurse And Allied Staffing | Sale of business
Goodwill [Roll Forward]
Aggregate goodwill acquired, beginning balance	9,889
Aggregate goodwill acquired, ending balance	9,889
Physician Staffing
Goodwill [Roll Forward]
Aggregate goodwill acquired, beginning balance	43,405
Accumulated impairment loss, beginning balance	(40,598)
Goodwill, net of impairment loss, beginning balance	2,807
Goodwill acquisition adjustment - Selected	0
Aggregate goodwill acquired, ending balance	43,405
Accumulated impairment loss, ending balance	(40,598)
Goodwill, net of impairment loss, ending balance	2,807
Physician Staffing | Sale of business
Goodwill [Roll Forward]
Aggregate goodwill acquired, beginning balance	0
Aggregate goodwill acquired, ending balance	$ 0