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INVESTMENTS IN UNCONSOLIDATED ENTITIES (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022 USD ($) board_member	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) board_member	Jun. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Equity method investments
Total investments in unconsolidated real estate entities	$ 533,705		$ 533,705		$ 523,465
Management Service
Equity method investments
Management fees	$ 3,800	$ 3,000	$ 7,300	$ 5,700
Atria
Equity method investments
Ownership percentage	34.00%		34.00%
Number of board members appointed \| board_member	2		2
Ardent
Equity method investments
Ownership percentage	9.80%		9.80%
Number of board members appointed \| board_member	1		1
Unconsolidated Properties \| Ventas Life Science & Healthcare Real Estate Fund
Equity method investments
Ownership percentage	21.90%		21.90%		21.10%
Total investments in unconsolidated real estate entities	$ 261,630		$ 261,630		$ 267,475
Unconsolidated Properties \| Pension Fund Joint Venture
Equity method investments
Ownership percentage	22.90%		22.90%		22.90%
Total investments in unconsolidated real estate entities	$ 27,532		$ 27,532		$ 29,192
Unconsolidated Properties \| Research & Innovation Development Joint Venture
Equity method investments
Ownership percentage	50.70%		50.70%		51.00%
Total investments in unconsolidated real estate entities	$ 239,478		$ 239,478		$ 221,363
Unconsolidated Properties \| Ventas Investment Management Platform
Equity method investments
Total investments in unconsolidated real estate entities	528,640		528,640		518,030
Unconsolidated Properties \| All other
Equity method investments
Total investments in unconsolidated real estate entities	$ 5,065		$ 5,065		$ 5,435
Unconsolidated Properties \| All other \| Minimum
Equity method investments
Ownership percentage	34.00%		34.00%		34.00%
Unconsolidated Properties \| All other \| Maximum
Equity method investments
Ownership percentage	50.00%		50.00%		50.00%