Segment Information - Reconciliation of Revenue and Segment Operating Income by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ 857,445	$ 608,351	$ 1,743,390	$ 1,210,812
Segment operating income	99,174	38,401	203,576	74,144
Depreciation and amortization	24,740	22,071	47,994	42,160
Depreciation (included in cost of revenue)	616	355	1,087	500
Share-based compensation	6,019	6,347	15,306	11,274
Interest expense, net, and other	10,111	11,443	19,055	22,497
Income before income taxes	89,063	26,958	184,521	51,647
Nurse and allied solutions
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	624,485	444,464	1,281,146	868,810
Physician and leadership solutions
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	139,104	108,622	279,860	246,464
Technology and workforce solutions
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	93,856	55,265	182,384	95,538
Operating segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	857,445	608,351	1,743,390	1,210,812
Segment operating income	154,176	98,339	319,011	187,811
Operating segments \| Nurse and allied solutions
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	624,485	444,464	1,281,146	868,810
Segment operating income	89,674	61,175	191,204	120,783
Operating segments \| Physician and leadership solutions
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	139,104	108,622	279,860	246,464
Segment operating income	21,849	15,325	43,065	29,894
Operating segments \| Technology and workforce solutions
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	93,856	55,265	182,384	95,538
Segment operating income	42,653	21,839	84,742	37,134
Unallocated corporate overhead
Segment Reporting, Revenue Reconciling Item [Line Items]
Unallocated corporate overhead	$ 23,627	$ 31,165	$ 51,048	$ 59,733

Unallocated corporate overhead.

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Amount of expense for allocation of cost of tangible asset over its useful life directly used in production of good and rendering of service.

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Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.

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Amount of the cost of borrowed funds accounted for as interest expense.

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