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Summary of Significant Accounting Policies - Related Party Transactions (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Related Party Transaction [Line Items]        
Revenue $ 365,662 $ 387,202 $ 699,807 $ 699,244
Douglas Elliman | Related Party | Tax Disaffiliation Agreement        
Related Party Transaction [Line Items]        
Other expenses   553   553
Douglas Elliman | VIE        
Related Party Transaction [Line Items]        
Proceeds from commissions received 0 201 842 1,101
Douglas Elliman | Transition Services Agreement | Related Party        
Related Party Transaction [Line Items]        
Revenue 1,050   2,100  
Douglas Elliman | Aviation Agreements | Related Party        
Related Party Transaction [Line Items]        
Revenue $ 734 $ 686 $ 1,296 $ 1,177