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Master Transactions and Cooperation Agreement with Brookdale (Details) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jan. 31, 2020 USD ($) property lease | May 31, 2021 USD ($) property | Dec. 31, 2020 USD ($) property | Oct. 31, 2019 USD ($) property | Sep. 30, 2021 USD ($) property | Sep. 30, 2020 USD ($) property | Mar. 31, 2020 USD ($) property | Sep. 30, 2021 USD ($) property | Sep. 30, 2020 USD ($) property | Dec. 31, 2020 USD ($) property | Jan. 31, 2021 property
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property count | property | 15 |  |  |  |  |  |  |  |  |  |
Number of properties acquired | property |  |  |  |  |  |  |  | 0 |  |  |
Number of properties disposed | property |  |  |  |  |  |  |  |  | 18 |  |
Capital investment |  |  | $ 5,000,000 |  |  |  |  |  |  | $ 5,000,000 |
Gain upon change of control, net |  |  |  |  |  |  |  | $ 1,042,000 | $ 173,222,000 |  |
Long-term debt |  |  |  |  | $ 5,538,404,000 |  |  | 5,538,404,000 |  |  |
Gain on sales of real estate, net |  |  |  |  | $ 14,635,000 | $ 2,283,000 |  | $ 189,873,000 | 85,636,000 |  |
Measurement Input, Discount Rate | Minimum |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Measurement input | 0.10 |  |  |  |  |  |  |  |  |  |
Measurement Input, Discount Rate | Maximum |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Measurement input | 0.12 |  |  |  |  |  |  |  |  |  |
Measurement Input, Annual Rent Escalators | Minimum |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Measurement input | 0.02 |  |  |  |  |  |  |  |  |  |
Measurement Input, Annual Rent Escalators | Maximum |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Measurement input | 0.03 |  |  |  |  |  |  |  |  |  |
Measurement Input, Cap Rate | Minimum |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Measurement input | 0.07 |  |  |  |  |  |  |  |  |  |
Measurement Input, Cap Rate | Maximum |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Measurement input | 0.09 |  |  |  |  |  |  |  |  |  |
Brookedale MTCA |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of properties disposed | property | 18 |  |  |  |  |  |  |  |  | 18 |
Cash proceeds | $ 385,000,000 |  |  |  |  |  |  |  |  |  |
Gain on sales of real estate, net | $ 164,000,000 |  |  |  |  |  |  |  |  |  |
CCRC JV |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property count | property |  |  |  |  | 0 |  |  | 0 |  |  |
Investment ownership percentage | 49.00% | 49.00% | 49.00% |  |  |  |  |  |  | 49.00% |
Equity method investments |  |  | $ 1,581,000 |  | $ 0 |  |  | $ 0 |  | $ 1,581,000 |
Proceeds from sale of buildings |  | $ 19,000,000 |  |  |  |  |  |  |  |  |
CCRC JV | Brookedale MTCA |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest acquired | 51.00% |  |  |  |  |  |  |  |  |  |
Purchase cost | $ 1,060,000,000.00 |  |  |  |  |  |  |  |  |  |
Management termination fee | $ 100,000,000 |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | property |  | 2 |  |  |  |  |  |  |  |  |
Proceeds from sale of buildings |  | $ 38,000,000 |  |  |  |  |  |  |  |  |
CCRC JV | Brookedale MTCA |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property count | property | 15 |  |  |  |  |  |  |  |  |  |
Number of properties acquired | property | 13 |  |  |  |  |  | 13 |  |  |  |
Equity method investments | $ 323,000,000 |  |  |  |  |  |  |  |  |  |
Real estate and intangible assets |  |  |  |  |  |  | $ 1,800,000,000 |  |  |  |
Refundable entrance fee liabilities |  |  |  |  |  |  | 308,000,000 |  |  |  |
Non-refundable entrance fee liabilities |  |  |  |  |  |  | 436,000,000 |  |  |  |
Long-term debt |  |  |  |  |  |  | 215,000,000 |  |  |  |
Working capital |  |  |  |  |  |  | 48,000,000 |  |  |  |
Cash paid |  |  |  |  |  |  | $ 396,000,000 |  |  |  |
CCRC JV | Brookedale MTCA | Government grant income recorded in other income (expense), net |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain upon change of control, net | $ 170,000,000 |  |  |  |  |  |  |  |  |  |
Senior Housing Triple-Net |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | property |  |  |  |  |  |  |  |  |  | 21 |
Proceeds from sale of buildings |  |  |  |  | $ 12,000,000 |  |  | $ 24,000,000 | $ 385,000,000 | $ 428,000,000 |
2019 Amended Master Lease | Brookedale MTCA |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Annual rent escalator percentage | 2.40% |  |  |  |  |  |  |  |  |  |
Lessor Asset Under Operating Lease | 2019 Amended Master Lease | Brookedale MTCA |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of properties to be restructured | property | 24 |  |  |  |  |  |  |  |  |  | 24
Number of leases to be terminated | 1 |  | 1 |  |  |  |  |  |  |  |
Percent of sales proceeds | 6.50% |  |  |  |  |  |  |  |  |  |
Number of properties to be reallocated | property | 14 |  |  |  |  |  |  |  |  |  |
Future rent | $ 20,000,000 |  |  |  |  |  |  |  |  |  |
Capital investment |  |  |  | $ 35,000,000 |  |  |  |  |  |  |
Capital investment term |  |  |  | 5 years |  |  |  |  |  |  |
Annual percent increase |  |  |  | 7.00% |  |  |  |  |  |  |
Other Non-reportable Segments |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | property |  |  |  |  |  | 1 |  |  | 1 | 1 |
Proceeds from sale of buildings |  |  |  |  |  | $ 1,000,000 |  |  | $ 1,000,000 | $ 1,000,000 |
Other Non-reportable Segments | Lessor Asset Under Operating Lease |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property count | property |  |  | 1 |  |  |  |  |  |  | 1 |
Other Non-reportable Segments | Lessor Asset Under Operating Lease | Brookedale MTCA |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property count | property | 13 |  |  |  |  |  |  |  |  |  |
Other Non-reportable Segments | Lessor Asset Under Operating Lease | CCRC JV |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property count | property |  |  |  | 15 |  |  |  |  |  |  |
Other Non-reportable Segments | Lessor Asset Under Operating Lease | CCRC JV | Brookedale MTCA |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property count | property | 13 |  |  |  |  |  |  |  |  |  |
Senior Housing Triple-Net |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | property |  |  |  |  | 4 |  |  | 7 | 18 |  |
Senior Housing Triple-Net | Lessor Asset Under Operating Lease |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property count | property |  |  |  | 43 |  |  |  |  |  |  |

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