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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) |

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