ACQUISITIONS (Narrative) (Details) $ in Thousands, € in Millions						3 Months Ended	9 Months Ended		12 Months Ended
	Apr. 05, 2022 USD ($)	Apr. 05, 2022 EUR (€)	Oct. 01, 2021 USD ($)	Oct. 01, 2021 EUR (€)	Apr. 14, 2021 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)	May 24, 2021 USD ($)	Dec. 31, 2020 USD ($)
Business Acquisition [Line Items]
Cash paid for acquisitions, net of cash acquired							$ 6,331	$ 152,594
Goodwill							2,301,739		$ 2,321,015		$ 2,235,999
North America
Business Acquisition [Line Items]
Goodwill							2,149,247		2,145,846		$ 2,085,494
Business Immo
Business Acquisition [Line Items]
Cash paid for acquisitions, net of cash acquired	$ 6,000	€ 6
Goodwill acquired	8,000
Intangible assets	$ 4,000
BureauxLocaux
Business Acquisition [Line Items]
Goodwill acquired			$ 27,000
Intangible assets			18,000
Aggregate purchase price			$ 41,000	€ 35
Homes.com
Business Acquisition [Line Items]
Intangible assets										$ 53,400
Purchase price before adjustments										150,000
Purchase price, net of adjustments					$ 148,000
Purchase price due					4 months
Fair value of identifiable net assets acquired						$ 152,000		152,000		152,175
Goodwill										91,875
Goodwill, expected tax deductible amount										20,000
Transaction costs							5,000
Tax liability accrual amount							7,000
Indemnification asset							$ 7,000
Increase in revenue						8,000		12,000
Decrease in net income						$ 7,000		$ 10,000
Homes.com | North America
Business Acquisition [Line Items]
Goodwill acquired									$ 88,500
Goodwill										$ 92,000