Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Revenue from services	$ 628,218	$ 636,098	$ 753,561	$ 788,732	$ 640,679	$ 374,905	$ 331,827	$ 329,241	$ 2,806,609	$ 1,676,652	$ 836,417
Temporary Staffing Services
Disaggregation of Revenue [Line Items]
Revenue from services									2,730,528	1,636,817	805,260
Other Services
Disaggregation of Revenue [Line Items]
Revenue from services									76,081	39,835	31,157
Nurse And Allied Staffing
Disaggregation of Revenue [Line Items]
Revenue from services									2,700,383	1,605,781	768,483
Nurse And Allied Staffing | Temporary Staffing Services
Disaggregation of Revenue [Line Items]
Revenue from services									2,629,088	1,568,974	740,441
Nurse And Allied Staffing | Other Services
Disaggregation of Revenue [Line Items]
Revenue from services									71,295	36,807	28,042
Physician Staffing
Disaggregation of Revenue [Line Items]
Revenue from services									106,226	70,871	67,934
Physician Staffing | Temporary Staffing Services
Disaggregation of Revenue [Line Items]
Revenue from services									101,440	67,843	64,819
Physician Staffing | Other Services
Disaggregation of Revenue [Line Items]
Revenue from services									$ 4,786	$ 3,028	$ 3,115