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Receivables and Allowance for Credit Losses - Narrative (Details)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2024
USD ($)
loan
Dec. 31, 2023
USD ($)
loan
Dec. 31, 2022
USD ($)
Notes Receivable and Allowance for Losses [Line Items]      
Allowance for credit loss $ 9,007 $ 8,616 $ 10,172
Notes receivable 99,722 78,900  
Write-offs, net of recoveries 10,700 600  
SG&A expenses      
Notes Receivable and Allowance for Losses [Line Items]      
Provision for credit losses 8,200 7,500  
Marketing And Reservation Fees      
Notes Receivable and Allowance for Losses [Line Items]      
Provision for credit losses 7,500 9,000  
Variable Interest Entity, Not Primary Beneficiary      
Notes Receivable and Allowance for Losses [Line Items]      
Notes receivable $ 116,800 $ 95,100  
Collateral-Dependent Loans      
Notes Receivable and Allowance for Losses [Line Items]      
Number of loans | loan 1 1  
Allowance for credit loss $ 2,200 $ 2,200  
Impaired Loans      
Notes Receivable and Allowance for Losses [Line Items]      
Average notes on nonaccrual status $ 15,200 $ 15,900