Business Segments - Schedule of Reconciliation of Revenue and Operating Income by Reportable Segment to Consolidated Results (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Segment Reporting Information [Line Items]
Service revenues	$ 5,378,506	$ 5,795,837	$ 6,392,517
Segment costs of services	3,352,431	3,529,844	3,801,252
Compensation expenses	1,282,626	1,336,622	1,428,108
Other	560,896	593,818	610,547
Segment selling, general and administrative expenses	1,843,522	1,930,440	2,038,655
Segment income	182,553	335,553	552,610
Interest income, net	(11,799)	(22,118)	(23,973)
Income before income taxes	194,352	357,671	576,583
Service revenues	(5,378,506)	(5,795,837)	(6,392,517)
Total contract talent solutions
Segment Reporting Information [Line Items]
Service revenues	2,990,083	3,357,872	3,895,332
Segment costs of services	1,823,322	2,041,348	2,346,020
Compensation expenses	842,438	884,121	934,024
Other	275,702	301,885	322,473
Segment selling, general and administrative expenses	1,118,140	1,186,006	1,256,497
Segment income	48,621	130,518	292,815
Service revenues	(2,990,083)	(3,357,872)	(3,895,332)
Total contract talent solutions | Elimination of intersegment revenues
Segment Reporting Information [Line Items]
Service revenues	(485,187)	(471,777)	(442,326)
Service revenues	485,187	471,777	442,326
Permanent Placement Talent Solutions
Segment Reporting Information [Line Items]
Service revenues	439,500	487,204	567,486
Segment costs of services	795	985	1,105
Compensation expenses	342,245	359,205	405,747
Other	74,896	80,962	85,630
Segment selling, general and administrative expenses	417,141	440,167	491,377
Segment income	21,564	46,052	75,004
Service revenues	(439,500)	(487,204)	(567,486)
Protiviti
Segment Reporting Information [Line Items]
Service revenues	1,948,923	1,950,761	1,929,699
Segment costs of services	1,528,314	1,487,511	1,454,127
Compensation expenses	97,943	93,296	88,337
Other	210,298	210,971	202,444
Segment selling, general and administrative expenses	308,241	304,267	290,781
Segment income	112,368	158,983	184,791
Service revenues	(1,948,923)	(1,950,761)	(1,929,699)
Contract Talent Solutions And Protiviti | Elimination of intersegment revenues
Segment Reporting Information [Line Items]
Service revenues	(485,200)	(471,800)	(442,300)
Service revenues	$ 485,200	$ 471,800	$ 442,300