Acquisitions, Dispositions and Other Significant Transactions - Community Transactions and Completed Dispositions of Owned Communities (Details) $ in Thousands	12 Months Ended			36 Months Ended
	Dec. 31, 2021 USD ($) community	Dec. 31, 2020 USD ($) community	Dec. 31, 2019 USD ($) community	Dec. 31, 2021 USD ($) community	Jul. 26, 2020 community
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets held for sale | $	$ 3,642	$ 16,061		$ 3,642
Gain (loss) on sale of assets, net | $	$ 288,835	$ 374,532	$ 7,245
Ventas, Inc
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of owned communities transferred					5
Communities Disposed of Through Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of communities disposed of				24
Communities Disposed of Through Sale | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of communities disposed of	3	2	14
Net cash proceeds | $	$ 16,500	$ 38,100	$ 85,400
Gain (loss) on sale of assets, net | $	$ 300	$ 2,700	$ 5,500
Communities Disposed of Through Lease Terminations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of communities disposed of	2	5	10	17
41 Communities Disposed of Through Lease Terminations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of communities disposed of				41
Communities Held For Sale | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of communities classified as held for sale	2
Assets held for sale | $	$ 3,600			$ 3,600
Communities Acquired Previously Leased or Managed
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of communities acquired				27