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Real Estate Transactions - Real Estate Investments (Details) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Nov. 03, 2020 USD ($) | Oct. 31, 2020 USD ($) a property | Sep. 30, 2020 USD ($) | Jul. 31, 2020 USD ($) property | Apr. 30, 2020 USD ($) | Dec. 31, 2019 USD ($) property asset | Jul. 31, 2019 USD ($) property facility | Jun. 30, 2019 USD ($) property | May 31, 2019 USD ($) property | Apr. 30, 2019 USD ($) property | Mar. 31, 2019 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) property | Dec. 31, 2018 property
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt assumed |  |  | $ 6,420,792 |  |  |  |  |  |  |  |  | $ 6,420,792 |  |  |
Loss (gain) upon change of control, net |  |  |  |  |  |  |  |  |  |  |  | $ 173,222 | $ 11,481 |  |
SHOP JV |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss (gain) upon change of control, net |  |  |  |  |  | $ 161,000 |  |  |  |  |  |  |  |  |
Assets Leased to Others |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of assets transitioned | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 37
SHOP JV |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment ownership percentage |  |  | 54.00% |  |  |  |  |  |  |  |  | 54.00% |  |  |
Purchase cost |  |  |  |  |  | $ 367,000 |  |  |  |  |  |  |  | $ 367,000 |
Partnership investment ownership percentage |  |  |  |  |  | 46.50% |  |  |  |  |  |  |  | 46.50% |
Mortgage Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt assumed |  |  | $ 420,792 |  |  |  | $ 112,000 |  | $ 50,000 |  |  | $ 420,792 |  |  |
Massachusetts | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  | $ 54,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Massachusetts | Life science joint ventures | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment ownership percentage |  | 49.00% |  |  |  |  |  |  |  |  |  |  |  |  |
San Francisco, California | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for deposits on real estate acquisitions | $ 10,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Area of land | a |  | 12 |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire land |  | $ 128,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of adjacent sites currently held | property |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |
Life science | Life science facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  |  |  |  |  |  |  |  |  |  | $ 71,000 |  |  |  |
Life science | Land |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  |  |  |  |  |  |  |  |  |  | $ 27,000 |  |  |  |
Life science | Massachusetts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  |  |  |  | $ 320,000 |  |  |  |  |  |  |  |  |  |
Life science | Massachusetts | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  | $ 610,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired | property |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for deposits on real estate acquisitions |  | $ 20,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Life science | Boston | Life science facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  |  |  |  |  |  | $ 228,000 |  |  |  |  |  |  |  |
Number of properties acquired | facility |  |  |  |  |  |  | 4 |  |  |  |  |  |  |  |
Life science | Cambridge | Life science facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  |  |  |  |  | $ 333,000 |  |  |  |  |  |  |  |  |
Number of properties acquired | asset |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |
Life science | San Diego |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired | property |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |
Life science | San Diego | Life science facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 16,000 |
Medical office |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired | property |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |
Medical office | ARIZONA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  |  |  | $ 27,000 |  |  |  |  |  |  |  |  |  |  |
Medical office | Indiana, Missouri, Illinois |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for deposits on real estate acquisitions |  |  | $ 9,000 |  |  |  |  |  |  |  |  |  |  |  |
Medical office | Indiana, Missouri, Illinois | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  | $ 169,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired | property |  | 7 |  |  |  |  |  |  |  |  |  |  |  |  |
Medical office | Kansas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 15,000 |
Number of properties acquired | property |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |
Medical office | Texas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9,000 |
Number of properties acquired | property |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |
Life science joint ventures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  |  |  |  |  |  |  | $ 245,000 |  |  |  |  |  |  |
Number of properties acquired | property |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |
Senior Housing | Vintage Park JV |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired | property |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |
Investment ownership percentage |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |
Payments to acquire outstanding equity interests |  |  |  |  |  |  |  | $ 24,000 |  |  |  |  |  |  |
Gain (loss) from change of control, net |  |  |  |  |  |  |  | 12,000 |  |  |  |  |  |  |
Gain on consolidation, tax |  |  |  |  |  |  |  | $ 1,000 |  |  |  |  |  |  |
Senior Housing | Senior Housing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  |  |  |  |  |  | $ 284,000 |  | $ 113,000 | $ 445,000 |  |  |  |  |
Number of properties acquired | property |  |  |  |  |  |  | 5 |  | 3 | 9 |  |  |  |  |
SHOP | Assets Leased to Others |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of assets transitioned | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20
SHOP | SHOP JV |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment ownership percentage |  |  |  |  |  | 53.50% |  |  |  |  |  |  |  | 53.50% |
Purchase cost |  |  |  |  |  | $ 790,000 |  |  |  |  |  |  |  | $ 790,000 |
SHOP | SHOP JV | Assets Leased to Others |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of assets transitioned | property |  |  |  |  |  | 19 |  |  |  |  |  |  |  |  |

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