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Real Estate Transactions - Dispositions of Real Estate (Details) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jan. 31, 2020 USD ($) property | Oct. 31, 2020 USD ($) property | Sep. 30, 2020 USD ($) property | Jun. 30, 2020 USD ($) property | Mar. 31, 2020 USD ($) property | Sep. 30, 2019 USD ($) property | Jun. 30, 2021 USD ($) property | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) property | Dec. 31, 2019 property
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Gain (loss) on sales of real estate, net |  |  | $ 149 |  | $ 165,000 | $ (784) |  | $ 247,881 | $ 18,708 |
Number of properties disposed | property |  |  |  |  | 18 |  |  |  |  |
Brookedale MTCA |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Gain (loss) on sales of real estate, net | $ 164,000 |  |  |  |  |  |  |  |  |
Number of properties disposed | property | 18 |  |  |  |  |  |  |  |  | 18
SHOP and Senior Housing Triple-Net | Subsequent Event |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from sale of buildings |  | $ 88,000 |  |  |  |  |  |  |  |
SHOP |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from sale of buildings |  |  | 12,000 | $ 28,000 | $ 36,000 | 7,000 |  |  | 89,000 |
Gain (loss) on sales of real estate, net |  |  |  | 2,000 |  |  |  |  |  |
SHOP | Subsequent Event | Definitive Agreement Four |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from sale of buildings |  | $ 3,000 |  |  |  |  | $ 115,000 |  |  |
Senior housing triple-net |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from sale of buildings |  |  |  |  | $ 385,000 |  |  |  | 26,000 |
Medical office |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from sale of buildings |  |  | 14,000 |  |  | $ 3,000 |  |  | 18,000 |
Medical office | San Diego |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from sale of buildings |  |  |  | 106,000 |  |  |  |  |  |
Gain (loss) on sales of real estate, net |  |  |  | $ 81,000 |  |  |  |  |  |
Undeveloped MOB land parcel |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from sale of buildings |  |  | $ 2,000 |  |  |  |  |  |  |
Life science |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from sale of buildings |  |  |  |  |  |  |  |  | 7,000 |
Undeveloped Life Science |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from sale of buildings |  |  |  |  |  |  |  |  | $ 35,000 |
SHOP |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | property |  |  | 4 | 2 | 7 | 1 |  |  | 11 |
SHOP | Subsequent Event |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | property |  | 7 |  |  |  |  |  |  |  |
SHOP | Subsequent Event | Definitive Agreement Four |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | property |  |  |  |  |  |  | 7 |  |  |
Senior housing triple-net |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | property |  |  |  |  | 18 |  |  |  | 2 |
Senior housing triple-net | Subsequent Event |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | property |  | 3 |  |  |  |  |  |  |  |
Medical office |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | property |  |  | 4 |  |  | 1 |  |  | 6 |
Medical office | San Diego |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | property |  |  |  | 3 |  |  |  |  |  |
Undeveloped MOB land parcel |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | property |  |  | 1 |  |  |  |  |  |  |
Other non-reportable |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | property |  |  | 1 |  |  |  |  |  |  |
Proceeds from sale of buildings |  |  | $ 1,000 |  |  |  |  |  |  |
Life science |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | property |  |  |  |  |  |  |  |  | 1 |
Undeveloped Life Science |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | property |  |  |  |  |  |  |  |  | 1 |

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