Fair Value Measurements - Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation plan assets	$ 130,284	$ 118,862
Available-for-sale debt securities	39,328	43,485	$ 38,670
Deferred compensation plan liabilities	(130,284)	(118,862)
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation plan assets	130,284	118,862
Available-for-sale debt securities	39,328	43,485
Other depository assets	519	868
Deferred compensation plan liabilities	(130,284)	(118,862)
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swaps	8,183	7,809
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent purchase price liabilities	$ (120,014)	$ (132,010)