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Senior Living Community Leases and Management Agreements - Schedule of Assets Leased and Revenues Earned (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Concentration Risk |  |  |
Gross Book Value of Real Estate Assets | $ 6,813,556 | $ 7,410,730 |
Revenue | 1,383,212 | 1,632,026 | $ 1,040,155
Senior Living Communities |  |  |
Concentration Risk |  |  |
Revenue | $ 974,623 | $ 1,204,811 | 433,597
Real Estate Investment Property At Cost | Rents from significant lessee |  |  |
Concentration Risk |  |  |
Gross Book Value of Real Estate Assets |  |  | $ 8,420,623
Concentration of credit risk (as a percent) |  |  | 100.00%
Revenue | Senior Living Communities |  |  |
Concentration Risk |  |  |
Revenue |  |  | $ 433,597
Revenue | Rents from significant lessee |  |  |
Concentration Risk |  |  |
Concentration of credit risk (as a percent) |  |  | 100.00%
Revenue |  |  | $ 1,040,155
All others | Real Estate Investment Property At Cost | Rents from significant lessee |  |  |
Concentration Risk |  |  |
Gross Book Value of Real Estate Assets |  |  | $ 6,133,672
Concentration of credit risk (as a percent) |  |  | 72.80%
All others | Real Estate Investment Property At Cost | Rents from significant lessee | Discontinued Operations, Held-for-sale |  |  |
Concentration Risk |  |  |
Gross Book Value of Real Estate Assets |  |  | $ 213,416
All others | Revenue | Rents from significant lessee |  |  |
Concentration Risk |  |  |
Concentration of credit risk (as a percent) |  |  | 86.70%
Revenue |  |  | $ 902,257
Five Star | Real Estate Investment Property At Cost | Rents from significant lessee |  |  |
Concentration Risk |  |  |
Gross Book Value of Real Estate Assets |  |  | $ 2,286,951
Concentration of credit risk (as a percent) |  |  | 27.20%
Five Star | Real Estate Investment Property At Cost | Rents from significant lessee | Discontinued Operations, Held-for-sale |  |  |
Concentration Risk |  |  |
Gross Book Value of Real Estate Assets |  |  | $ 50,951
Five Star | Real Estate Investment Property At Cost | Rents from significant lessee | Senior Living Communities |  |  |
Concentration Risk |  |  |
Gross Book Value of Real Estate Assets |  |  | $ 1,920,070
Five Star | Revenue | Rents from significant lessee |  |  |
Concentration Risk |  |  |
Concentration of credit risk (as a percent) |  |  | 13.30%
Revenue |  |  | $ 137,898

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