Business Segments - Depreciation Expense by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Segment Reporting Information [Line Items]
Depreciation	$ 12,602	$ 12,516	$ 25,608	$ 25,520
Total contract talent solutions
Segment Reporting Information [Line Items]
Depreciation	6,219	6,364	12,717	12,957
Permanent placement talent solutions
Segment Reporting Information [Line Items]
Depreciation	2,043	2,047	4,141	4,271
Protiviti
Segment Reporting Information [Line Items]
Depreciation	$ 4,340	$ 4,105	$ 8,750	$ 8,292