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Master Transactions and Cooperation Agreement with Brookdale (Details) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
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Jan. 31, 2020 USD ($) bbl lease property | Dec. 31, 2020 USD ($) lease property | Nov. 30, 2020 USD ($) | Nov. 30, 2019 property | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Nov. 30, 2017 USD ($) property facility | Mar. 31, 2021 property | Dec. 31, 2018 USD ($) property | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) property | Dec. 31, 2019 USD ($) property | Dec. 31, 2018 USD ($) property | Mar. 31, 2020 property | Oct. 31, 2019 property | Jan. 01, 2018 USD ($) property
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property count | 15 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital investment | $ |  | $ 5,000,000 |  |  |  |  |  |  |  |  | $ 5,000,000 |  |  |  |  |
Loss (gain) upon change of control, net | $ |  |  | $ 16,000,000 |  |  |  |  |  |  |  | 159,973,000 | $ 168,023,000 | $ 9,154,000 |  |  |
Long-term debt | $ |  | $ 6,616,855,000 |  |  |  |  |  |  |  |  | 6,616,855,000 |  |  |  |  |
Gain (loss) on sales of real estate, net | $ |  |  |  |  |  |  |  |  |  |  | $ 90,350,000 | $ (40,000) | $ 831,368,000 |  |  |
Payments to acquire additional interest in subsidiaries | $ |  |  |  |  | $ 63,000,000 | $ 32,000,000 |  |  |  |  |  |  |  |  |  |
Brookedale MTCA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of assets to be sold |  |  |  |  |  |  |  |  | 19 |  |  |  |  |  |  |
RIDEA Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  | 90.00% |  |  |  |  |  |  |  |  |
Assets leased to others |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of assets sold or transitioned |  |  |  |  |  |  |  |  |  |  |  | 37 |  |  |  |
Assets leased to others | Brookedale MTCA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sales of real estate, net | $ |  |  |  |  |  |  |  |  | $ 40,000,000 |  |  |  |  |  |  |
Assets leased to others | RIDEA Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property count | facility |  |  |  |  |  |  | 58 |  |  |  |  |  |  |  |  |
Other Non-Reporting Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of assets to be sold |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |
Other Non-Reporting Segment | Assets leased to others |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property count |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |
Other Non-Reporting Segment | Assets leased to others | CCRC JV Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property count |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 | 15 |
Senior Housing Triple Net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of assets to be sold |  |  |  |  |  |  |  |  |  |  |  | 2 | 2 |  |  |
Senior Housing Triple Net | Assets leased to others |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property count |  |  |  |  |  |  | 78 |  |  |  |  |  |  |  | 43 |
Right to sell, or transition, number of properties (in properties) |  |  |  |  |  |  | 32 |  |  |  |  |  |  |  |  |
Rent concessions | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,000,000
Number of properties with rent concessions (in properties) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3
Number of assets to be sold |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |
Total consideration for disposition of real estate | $ |  |  |  |  |  |  | $ 35,000,000 |  |  |  |  |  |  |  |  |
Number of assets sold or transitioned |  |  |  |  |  |  |  |  |  |  |  | 17 |  |  |  |
Senior Housing Triple Net | Assets leased to others | Brookedale MTCA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of assets to be sold |  |  |  |  |  |  |  |  | 11 |  |  |  |  |  |  |
Senior Housing Operating Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of assets to be sold |  |  |  |  |  |  |  |  |  |  | 23 | 18 | 23 |  |  |
Senior Housing Operating Portfolio | Brookedale MTCA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of assets to be sold |  |  |  |  |  |  |  |  | 8 |  |  |  |  |  |  |
Senior Housing Operating Portfolio | Assets leased to others |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of assets sold or transitioned |  |  |  |  |  |  |  |  |  |  |  | 20 |  |  |  |
Senior Housing Operating Portfolio | Assets leased to others | Brookedale MTCA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of assets to be sold |  |  |  |  |  |  | 4 |  |  |  |  |  |  |  |  |
Senior Housing Operating Portfolio | Assets leased to others | RIDEA Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property count | facility |  |  |  |  |  |  | 36 |  |  |  |  |  |  |  |  |
Total consideration for disposition of real estate | $ |  |  |  |  |  |  | $ 240,000,000 |  |  |  |  |  |  |  |  |
Discount rate | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate capitalization rate | bbl | 0.10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate capitalization rate | bbl | 0.12 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cap rate | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate capitalization rate | bbl | 0.07 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cap rate | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate capitalization rate | bbl | 0.09 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Measurement Input Annual Rent Escalators | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate capitalization rate | bbl | 0.02 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Measurement Input Annual Rent Escalators | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate capitalization rate | bbl | 0.03 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CCRC JV Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment ownership percentage | 49.00% | 49.00% |  |  |  |  |  |  |  |  | 49.00% | 49.00% |  |  |  |
Equity method investments | $ |  | $ 1,581,000 |  |  |  |  |  |  |  |  | $ 1,581,000 | $ 325,830,000 |  |  |  |
RIDEA Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percent of noncontrolling interest acquired |  |  |  |  |  |  | 10.00% |  |  |  |  |  |  |  |  |
Brookedale MTCA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties disposed | 18 |  |  |  |  |  |  |  |  |  | 18 | 18 |  |  |  |
Cash proceeds | $ | $ 385,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sales of real estate, net | $ | $ 164,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Brookedale MTCA | CCRC JV Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property count | 15 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired | 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 |  |  |  |  |  |  |  |  |  | $ 484,000,000 | $ 68,000,000 |  |  |  |
Long-term debt | $ | 215,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Working capital | $ | 48,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire equity method investments | $ | 396,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Brookedale MTCA | CCRC JV Investment | Other nonoperating income (expense) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss (gain) upon change of control, net | $ | $ 170,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Brookedale MTCA | 2019 Amended Master Lease |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual rent escalator | 2.40% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Brookedale MTCA | Assets leased to others | 2019 Amended Master Lease |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties to be restructured | 24 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of leases to be terminated (in properties) | lease | 1 | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percent of sales proceeds | 6.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties to be reallocated | 14 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of future rent to be paid | $ | $ 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Brookedale MTCA | Assets leased to others | 2019 Amended Master Lease | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital investment | $ |  |  |  |  |  |  |  |  |  | $ 35,000,000 |  |  |  |  |  |
Capital investment term |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |
Annual percentage increase |  |  |  |  |  |  |  |  |  | 7.00% |  |  |  |  |  |
Brookedale MTCA | Other Non-Reporting Segment | Assets leased to others |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property count | 13 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Brookedale MTCA | Other Non-Reporting Segment | Assets leased to others | CCRC JV Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property count | 13 | 13 |  |  |  |  |  |  |  |  | 13 |  |  | 13 |  |
Brookedale MTCA | CCRC JV Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest acquired | 51.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase cost | $ | $ 1,060,000,000.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-cash lease and management fee termination loss (income), net | $ | $ 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Brookedale MTCA | CCRC JV Investment | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of assets to be sold |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |

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