Revenue Recognition - Schedule of Revenue Disaggregated by Functional Specialization and Segments (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2024 USD ($) segment	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Revenue from Contract with Customer [Abstract]
Number of reportable segments | segment	3
Guarantee period	90 days
Disaggregation of Revenue [Line Items]
Service revenues	$ 5,795,837	$ 6,392,517	$ 7,238,142
Contract Talent Solutions
Disaggregation of Revenue [Line Items]
Service revenues	3,357,872	3,895,332	4,532,847
Contract Talent Solutions | Elimination Of Intersegment Revenues
Disaggregation of Revenue [Line Items]
Service revenues	(471,777)	(442,326)	(552,231)
Contract Talent Solutions | Finance and accounting
Disaggregation of Revenue [Line Items]
Service revenues	2,454,119	2,811,093	3,185,183
Contract Talent Solutions | Administration and customer support
Disaggregation of Revenue [Line Items]
Service revenues	741,468	816,409	1,042,634
Contract Talent Solutions | Technology
Disaggregation of Revenue [Line Items]
Service revenues	634,062	710,156	857,261
Permanent Placement Talent Solutions
Disaggregation of Revenue [Line Items]
Service revenues	487,204	567,486	725,155
Protiviti
Disaggregation of Revenue [Line Items]
Service revenues	$ 1,950,761	$ 1,929,699	$ 1,980,140