FAIR VALUE MEASUREMENTS - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets of deferred compensation plan	$ 165,466	$ 143,499
Available-for-sale debt securities	40,799	39,459	$ 43,485
Deferred compensation plan obligations	(165,466)	(143,499)
Bank debt	(337,300)	(312,400)
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets of deferred compensation plan	165,466	143,499
Available-for-sale debt securities	40,799	39,459
Other depository assets	346	1,031
Deferred compensation plan obligations	(165,466)	(143,499)
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swaps	1,279	3,999
Bank debt	(335,835)	(310,826)
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent purchase price liabilities	$ (78,002)	$ (114,946)