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Real Estate Transactions - Real Estate Investments (Details) | 1 Months Ended | 3 Months Ended | 12 Months Ended
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Apr. 30, 2021 USD ($) property | Feb. 28, 2021 USD ($) property | Dec. 31, 2020 USD ($) property | Nov. 30, 2020 USD ($) property | Oct. 31, 2020 USD ($) a property | Jul. 31, 2020 USD ($) property | Apr. 30, 2020 USD ($) | Mar. 31, 2021 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2020 asset
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Loss from change of control |  |  |  |  |  |  |  | $ (1,042,000) | $ (167,434,000) |
Debt assumed |  |  |  |  |  |  |  | $ 5,803,487,000 |  |
Life science joint ventures |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Investment ownership percentage |  |  |  |  |  |  |  | 49.00% |  |
Waldwick |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Number of properties acquired | property |  |  |  |  | 1 |  |  |  |  |
Investment ownership percentage |  |  |  |  | 100.00% |  |  |  |  |
Additional ownership percentage acquired |  |  |  |  | 15.00% |  |  |  |  |
Payments to acquire real estate joint ventures |  |  |  |  | $ 4,000,000 |  |  |  |  |
Gain from change of control, net |  |  |  |  | $ 6,000,000 |  |  |  |  |
Mbk Jv |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Number of properties acquired | property |  |  |  | 1 |  |  |  |  |  |
Proceeds from divestiture of interest in joint venture |  |  |  | $ 11,000,000 |  |  |  |  |  |
Loss from change of control |  |  |  | 16,000,000 |  |  |  |  |  |
Debt assumed |  |  |  | 36,000,000 |  |  |  |  |  |
San Francisco, California |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Area of land | a |  |  |  |  | 12 |  |  |  |  |
Payments to acquire land |  |  |  |  | $ 128,000,000 |  |  |  |  |
Number of adjacent sites currently held | property |  |  |  |  | 2 |  |  |  |  |
Payments for deposits on real estate acquisitions |  |  |  | $ 10,000,000 |  |  |  |  |  |
San Francisco, California | Subsequent Event | First Tranche |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Payments to acquire land | $ 61,000,000 |  |  |  |  |  |  |  |  |
Massachusetts |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  |  | $ 54,000,000 |  |  |  |  |  |  |
Massachusetts | Life science joint ventures |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Investment ownership percentage |  |  | 49.00% |  |  |  |  |  |  | 49.00%
Medical office | Subsequent Event | Mortgage Debt |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Amount | $ 142,000,000 |  |  |  |  |  |  |  |  |
Medical office | TENNESSEE |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Number of properties acquired | property |  | 1 |  |  |  |  |  |  |  |
Payments to acquire real estate |  | $ 13,000,000 |  |  |  |  |  |  |  |
Medical office | COLORADO | Subsequent Event |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Number of properties acquired | property | 1 |  |  |  |  |  |  |  |  |
Payments to acquire real estate | $ 38,000,000 |  |  |  |  |  |  |  |  |
Medical office | UNITED STATES | Subsequent Event |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Number of properties acquired | property | 14 |  |  |  |  |  |  |  |  |
Payments to acquire real estate | $ 371,000,000 |  |  |  |  |  |  |  |  |
Medical office | ARIZONA |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Number of properties acquired | property |  |  |  |  |  | 1 |  |  |  |
Payments to acquire real estate |  |  |  |  |  | $ 27,000,000 |  |  |  |
Medical office | Indiana, Missouri, Illinois |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Number of properties acquired | property |  |  |  |  | 7 |  |  |  |  |
Payments to acquire real estate |  |  |  |  | $ 169,000,000 |  |  |  |  |
Medical office | T X |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Number of properties acquired | property |  |  | 1 |  |  |  |  |  |  |
Payments to acquire real estate |  |  | $ 34,000,000 |  |  |  |  |  |  |
Life science |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Number of properties acquired | asset |  |  |  |  |  |  |  |  |  | 1
Life science | Massachusetts |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Number of properties acquired | property |  |  | 3 |  |  |  |  |  |  |
Payments to acquire real estate |  |  | $ 610,000,000 |  |  |  | $ 320,000,000 |  |  |
Land parcel | Mbk Jv |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Number of properties acquired | property |  |  |  | 1 |  |  |  |  |  |

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