Revenue Recognition- Narrative (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($) segment	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 ($)
Disaggregation of Revenue [Line Items]
Number of reportable segments | segment				2					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
Nurse And Allied Staffing
Disaggregation of Revenue [Line Items]
Revenue from services									1,605,781	768,483	747,619
Revision of Prior Period, Adjustment | Nurse And Allied Staffing
Disaggregation of Revenue [Line Items]
Revenue from services										10,500	14,800
Other Services
Disaggregation of Revenue [Line Items]
Revenue from services									39,835	31,157	31,570
Other Services | Nurse And Allied Staffing
Disaggregation of Revenue [Line Items]
Revenue from services									$ 36,807	28,042	27,226
Other Services | Revision of Prior Period, Adjustment | Nurse And Allied Staffing
Disaggregation of Revenue [Line Items]
Revenue from services										$ 10,500	$ 14,800