CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Income Statement [Abstract]
Service revenues	$ 1,300,179	$ 1,351,907
Costs of services	820,270	852,862
Gross margin	479,909	499,045
Selling, general and administrative expenses	442,998	460,163
Operating income	36,911	38,882
(Income) loss from investments held in employee deferred compensation trusts (which is completely offset by related costs and expenses - Note A)	8,227	20,171
Interest income, net	(2,758)	(3,572)
Income before income taxes	31,442	22,283
Provision for income taxes	17,652	4,933
Net income	$ 13,790	$ 17,350
Net income per share:
Basic (in usd per share)	$ 0.14	$ 0.17
Diluted (in usd per share)	$ 0.14	$ 0.17
Weighted average shares:
Basic (in shares)	99,622	100,666
Diluted (in shares)	99,899	101,015
Dividends declared per share (in usd per share)	$ 0.59	$ 0.59