Goodwill, Trade Names, and Other Intangible Assets - Changes in Carrying Amount of Goodwill by Segment (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($)
Goodwill balances
Aggregate goodwill acquired, beginning of period	$ 411,285
Accumulated impairment loss, beginning of period	(310,472)
Goodwill, net of impairment loss, beginning of period	90,924
Aggregate goodwill acquired	28,566
Aggregate goodwill acquired, end of period	439,851
Accumulated impairment loss, end of period	(310,472)
Goodwill, net of impairment loss, end of period	119,490
Sale of business
Goodwill balances
Aggregate goodwill acquired, beginning of period	9,889
Aggregate goodwill acquired, end of period	9,889
Nurse And Allied Staffing
Goodwill balances
Aggregate goodwill acquired, beginning of period	367,880
Accumulated impairment loss, beginning of period	(269,874)
Goodwill, net of impairment loss, beginning of period	88,117
Aggregate goodwill acquired	28,566
Aggregate goodwill acquired, end of period	396,446
Accumulated impairment loss, end of period	(269,874)
Goodwill, net of impairment loss, end of period	116,683
Nurse And Allied Staffing | Sale of business
Goodwill balances
Aggregate goodwill acquired, beginning of period	9,889
Aggregate goodwill acquired, end of period	9,889
Physician Staffing
Goodwill balances
Aggregate goodwill acquired, beginning of period	43,405
Accumulated impairment loss, beginning of period	(40,598)
Goodwill, net of impairment loss, beginning of period	2,807
Aggregate goodwill acquired	0
Aggregate goodwill acquired, end of period	43,405
Accumulated impairment loss, end of period	(40,598)
Goodwill, net of impairment loss, end of period	2,807
Physician Staffing | Sale of business
Goodwill balances
Aggregate goodwill acquired, beginning of period	0
Aggregate goodwill acquired, end of period	$ 0