Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]
Revenue from services	$ 640,679	$ 374,905	$ 331,827	$ 329,241	$ 215,606	$ 193,968	$ 216,779	$ 210,064	$ 1,676,652	$ 836,417	$ 822,224
Gross profit	147,150	83,794	72,590	71,465	54,392	48,003	50,734	49,603
Consolidated net income					4,822	(1,148)	(14,048)	(1,768)	132,002	(12,142)	(55,943)
Net income attributable to common stockholders	$ 77,573	$ 23,433	$ 11,548	$ 19,448	$ 4,612	$ (1,334)	$ (14,151)	$ (2,089)	$ 132,002	$ (12,962)	$ (57,713)
Net (loss) income per share attributable to common stockholders - Basic (usd per share)	$ 2.10	$ 0.63	$ 0.32	$ 0.54	$ 0.13	$ (0.04)	$ (0.39)	$ (0.06)	$ 3.60	$ (0.36)	$ (1.61)
Net income (loss) per share attributable to common stockholders - Diluted (usd per share)	$ 2.07	$ 0.62	$ 0.31	$ 0.53	$ 0.13	$ (0.04)	$ (0.39)	$ (0.06)	$ 3.53	$ (0.36)	$ (1.61)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment charges									$ 2,070	$ 16,248	$ 16,306
Restructuring costs			$ 800	$ 1,200	$ 900	$ 2,300	$ 2,300	$ 600	2,630	6,052	3,571
Legal fees to be recovered		$ 1,600
Legal fees					$ 600	800	1,600
Change in valuation allowance	$ 37,500								37,500
Nurse And Allied Staffing
Quarterly Financial Information Disclosure [Abstract]
Revenue from services									$ 1,605,781	$ 768,483	$ 747,619
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Amortization of assets						900	1,400	$ 700
Goodwill and Intangible Assets | Search Services
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment charges							10,500
Leased Property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment charges			$ 1,900			$ 900	$ 4,500