GOODWILL (Goodwill by Segment) (Details) - USD ($) $ in Thousands			3 Months Ended	9 Months Ended	12 Months Ended
	Apr. 05, 2022	Oct. 01, 2021	Mar. 31, 2021	Sep. 30, 2022	Dec. 31, 2021
Goodwill [Roll Forward]
Goodwill, beginning balance			$ 2,235,999	$ 2,321,015	$ 2,235,999
Acquisitions, including measurement period adjustments				10,949	87,793
Effect of foreign currency translation				(30,225)	(2,777)
Goodwill, ending balance				2,301,739	2,321,015
North America
Goodwill [Roll Forward]
Goodwill, beginning balance			2,085,494	2,145,846	2,085,494
Acquisitions, including measurement period adjustments				3,401	60,352
Effect of foreign currency translation				0	0
Goodwill, ending balance				2,149,247	2,145,846
International
Goodwill [Roll Forward]
Goodwill, beginning balance			150,505	175,169	150,505
Acquisitions, including measurement period adjustments				7,548	27,441
Effect of foreign currency translation				(30,225)	(2,777)
Goodwill, ending balance				152,492	175,169
Homes.com | North America
Goodwill [Roll Forward]
Goodwill acquired					88,500
Goodwill, measuring period adjustment				3,400
Ten-X | North America
Goodwill [Roll Forward]
Goodwill adjustments			1,400
Homesnap | North America
Goodwill [Roll Forward]
Goodwill adjustments			$ 26,700
BureauxLocaux
Goodwill [Roll Forward]
Goodwill acquired		$ 27,000
BureauxLocaux | International
Goodwill [Roll Forward]
Goodwill acquired					$ 27,400
Business Immo
Goodwill [Roll Forward]
Goodwill acquired	$ 8,000
Business Immo | International
Goodwill [Roll Forward]
Goodwill acquired				$ 7,500