Segment Data - Additional Information (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2021 USD ($) segment	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | segment									2
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
Contribution income									210,066	77,788	66,288
Nurse And Allied Staffing
Segment Reporting Information [Line Items]
Revenue from services									1,605,781	768,483	747,619
Contribution income									$ 205,738	74,169	63,530
Revision of Prior Period, Adjustment | Nurse And Allied Staffing
Segment Reporting Information [Line Items]
Revenue from services										10,500	14,800
Contribution income										$ (1,100)	$ (800)