SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Related Party Transactions (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Related Party Transaction [Line Items]
Revenue	[1]	$ 371,914	$ 365,662	$ 696,481	$ 699,807
Douglas Elliman | VIE
Related Party Transaction [Line Items]
Proceeds from commissions received		793	0	2,017	842
Douglas Elliman | Transition Services Agreement | Related Party
Related Party Transaction [Line Items]
Revenue		1,050	1,050	2,100	2,100
Douglas Elliman | Aviation Agreements | Related Party
Related Party Transaction [Line Items]
Revenue		$ 1,000	$ 734	$ 1,595	$ 1,296

[1] Revenues and cost of sales include federal excise taxes of $120,452, $126,750, $226,275 and $244,568 for the three and six months ended June 30, 2024 and 2023, respectively.