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Acquisitions, Dispositions and Other Significant Transactions - Additional Information (Details) $ in Thousands | 12 Months Ended | 36 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 USD ($) community | Dec. 31, 2019 USD ($) community | Dec. 31, 2018 USD ($) community | Dec. 31, 2020 USD ($) community | Dec. 31, 2019 USD ($) community | Aug. 31, 2020 community | Jul. 26, 2020 community
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Number of communities owned |  |  |  |  |  | 16 |
Number of communities leased | 301 |  |  | 301 |  |  |
Assets held for sale | $ | $ 16,061 | $ 42,671 |  | $ 16,061 | $ 42,671 |  |
Gain (loss) on sale of assets, net | $ | $ 374,532 | $ 7,245 | $ 293,246 |  |  |  |
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 |  |  | 22 | 43 |  |  |
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 | 5 | 10 | 89 | 104 |  |  |
147 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 |  |  |  |  | 147 |  |
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 | 33 |  |  |  |  |  |
Current Property Ownership Status |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Number of communities owned | 350 |  |  | 350 |  |  |
Number of communities leased | 301 |  |  | 301 |  |  |
Number of communities managed by third party | 75 |  |  | 75 |  |  |
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | 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 | 2 | 14 |  |  |  |  |
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Three Communities Held For Sale |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Number of communities classified as held for sale | 3 |  |  |  |  |  |
Assets held for sale | $ | $ 16,100 |  |  | $ 16,100 |  |  |
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Sale of 2 Community |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Net cash proceeds | $ | 38,100 |  |  |  |  |  |
Gain (loss) on sale of assets, net | $ | $ 2,700 |  |  |  |  |  |
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Sale Of 14 Communities |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Net cash proceeds | $ |  | $ 85,400 |  |  |  |  |
Gain (loss) on sale of assets, net | $ |  | 5,500 |  |  |  |  |
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Sale of 22 communities |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Net cash proceeds | $ |  |  | $ 380,700 |  |  |  |
Gain (loss) on sale of assets, net | $ |  |  | 188,600 |  |  |  |
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Assisted Living and Memory Care |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Number of communities classified as held for sale | 2 |  |  |  |  |  |
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | CCRC Venture |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Number of communities classified as held for sale | 1 |  |  |  |  |  |
Mortgage notes payable |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Payment for extinguishment of debt and prepayment penalties | $ |  | $ 5,100 | $ 174,000 |  |  |  |

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