CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Income Statement [Abstract]
Service revenues	$ 1,336,365	$ 1,369,743	$ 2,636,544	$ 2,721,650
Costs of services	862,338	860,269	1,682,608	1,713,131
Gross margin	474,027	509,474	953,936	1,008,519
Selling, general and administrative expenses	536,326	507,934	979,324	968,097
Operating (loss) income	(62,299)	1,540	(25,388)	40,422
(Income) loss from investments held in employee deferred compensation trusts (which is completely offset by related costs and expenses - Note A)	(100,878)	(57,654)	(92,651)	(37,483)
Interest income, net	(2,013)	(2,239)	(4,771)	(5,811)
Income before income taxes	40,592	61,433	72,034	83,716
Provision for income taxes	14,274	20,465	31,926	25,398
Net income	$ 26,318	$ 40,968	$ 40,108	$ 58,318
Net income per share:
Basic (in usd per share)	$ 0.26	$ 0.41	$ 0.40	$ 0.58
Diluted (in usd per share)	$ 0.26	$ 0.41	$ 0.40	$ 0.58
Weighted average shares:
Basic (in shares)	99,941	100,410	99,783	100,537
Diluted (in shares)	100,307	100,539	100,104	100,776
Dividends declared per share (in usd per share)	$ 0.59	$ 0.59	$ 1.18	$ 1.18