Business Segments - Schedule of Reconciliation of Revenue and Operating Income by Reportable Segment to Consolidated Results (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Segment Reporting [Line Items]
Service revenues	$ 1,300,179	$ 1,351,907
Segment costs of services	822,274	856,901
Compensation expenses	316,938	334,925
Other	132,283	141,370
Segment selling, general and administrative expenses	449,221	476,295
Segment income	28,684	18,711
Interest income, net	(2,758)	(3,572)
Income before income taxes	31,442	22,283
Service revenues	(1,300,179)	(1,351,907)
Contract talent solutions
Segment Reporting [Line Items]
Service revenues	725,016	763,205
Segment costs of services	443,263	466,272
Compensation expenses	206,511	220,982
Other	65,929	69,260
Segment selling, general and administrative expenses	272,440	290,242
Segment income	9,313	6,691
Service revenues	(725,016)	(763,205)
Contract talent solutions | Elimination of intersegment revenues
Segment Reporting [Line Items]
Service revenues	(116,830)	(117,897)
Service revenues	116,830	117,897
Permanent placement talent solutions
Segment Reporting [Line Items]
Service revenues	109,004	112,091
Segment costs of services	278	230
Compensation expenses	85,924	88,900
Other	16,746	19,337
Segment selling, general and administrative expenses	102,670	108,237
Segment income	6,056	3,624
Service revenues	(109,004)	(112,091)
Protiviti
Segment Reporting [Line Items]
Service revenues	466,159	476,611
Segment costs of services	378,733	390,399
Compensation expenses	24,503	25,043
Other	49,608	52,773
Segment selling, general and administrative expenses	74,111	77,816
Segment income	13,315	8,396
Service revenues	(466,159)	(476,611)
Contract Talent Solutions And Protiviti | Elimination of intersegment revenues
Segment Reporting [Line Items]
Service revenues	(116,800)	(117,900)
Service revenues	$ 116,800	$ 117,900