Accounts Payable, Accrued Expenses and Other Liabilities - Components of Other Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023	Dec. 31, 2022
Payables and Accruals [Abstract]
Accrued compensation	$ 117,995	$ 112,528
Payroll and other taxes payable	64,251	59,277
Financial guarantee liability	26,889	28,551	$ 27,729
Deferred rent	7,171	6,381
Contingent consideration	23,122	25,740
Other	12,554	9,264
Total	$ 251,982	$ 241,741