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Real Estate Properties - Narrative (Details) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
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Jun. 29, 2016 pooling_agreement | Feb. 28, 2019 USD ($) community | Dec. 31, 2018 USD ($) ft² state living_unit community property | Jun. 30, 2018 USD ($) living_unit community nursing_facility | May 31, 2018 USD ($) community | Mar. 31, 2018 USD ($) ft² building community property | Feb. 28, 2018 USD ($) living_unit community | Jan. 31, 2018 USD ($) ft² living_unit building community property | Dec. 31, 2017 USD ($) ft² living_unit building community property | Nov. 30, 2017 USD ($) ft² building property | Oct. 31, 2017 USD ($) ft² building property | Aug. 31, 2017 USD ($) | Jul. 31, 2017 USD ($) ft² building property | Jan. 31, 2017 USD ($) ft² building property | Dec. 31, 2016 USD ($) ft² living_unit community property | Oct. 31, 2016 USD ($) ft² building property | Sep. 30, 2016 USD ($) | Jul. 31, 2016 USD ($) building property | Jun. 30, 2016 USD ($) state living_unit property pooling_agreement lease_agreement | May 31, 2016 USD ($) ft² living_unit building community property | Apr. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Feb. 29, 2016 USD ($) ft² building property | Jun. 30, 2017 USD ($) | Dec. 31, 2018 USD ($) ft² state living_unit building community property | Dec. 31, 2017 USD ($) ft² property | Dec. 31, 2016 USD ($) ft² living_unit parcel building community property | Nov. 30, 2018 living_unit
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired real estate leases |  |  | $ 691,219,000 |  |  |  |  |  | $ 791,067,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 691,219,000 | $ 791,067,000 |  |
Net Book Value of Collateral |  |  | 6,341,908,000 |  |  |  |  |  | 6,370,286,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,341,908,000 | 6,370,286,000 |  |
Real estate property - accumulated depreciation |  |  | 1,534,392,000 |  |  |  |  |  | 1,454,477,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,534,392,000 | 1,454,477,000 |  |
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2019 |  |  | 579,757,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 579,757,000 |  |  |
2020 |  |  | 552,947,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 552,947,000 |  |  |
2021 |  |  | 528,448,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 528,448,000 |  |  |
2022 |  |  | 507,667,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 507,667,000 |  |  |
2023 |  |  | 483,525,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 483,525,000 |  |  |
Thereafter |  |  | $ 1,844,178,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,844,178,000 |  |  |
Area of real estate properties (in square feet) | ft² |  |  | 812,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 812,000 |  |  |
Mortgage debt assumed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 44,386,000 | 0 | $ 0 |
Number of states in which properties are located | state |  |  | 42 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 42 |  |  |
Acquired real estate lease obligations |  |  | $ 134,395,000 |  |  |  |  |  | 136,713,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 134,395,000 | 136,713,000 |  |
Accumulated amortization of capitalized below market lease values |  |  | 48,091,000 |  |  |  |  |  | 40,695,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 48,091,000 | 40,695,000 |  |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2019 |  |  | 57,515,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 57,515,000 |  |  |
2020 |  |  | 43,896,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 43,896,000 |  |  |
2021 |  |  | 39,410,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 39,410,000 |  |  |
2022 |  |  | 36,583,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 36,583,000 |  |  |
2023 |  |  | 35,089,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 35,089,000 |  |  |
Thereafter |  |  | 120,447,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 120,447,000 |  |  |
Impairment of assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 66,346,000 | 5,082,000 | 18,674,000 |
Gain on sale of properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 261,916,000 | 46,055,000 | $ 4,061,000 |
Lease committed but unspent tenant related obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 22,009,000 | 20,681,000 |  |
Land |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Book Value of Collateral |  |  | 844,567,000 |  |  |  |  |  | 824,879,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 844,567,000 | 824,879,000 |  |
Buildings and Improvements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Book Value of Collateral |  |  | 7,031,733,000 |  |  |  |  |  | 6,999,884,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,031,733,000 | 6,999,884,000 |  |
Building |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate property - accumulated depreciation |  |  | 1,408,793,000 |  |  |  |  |  | 1,250,057,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,408,793,000 | 1,250,057,000 |  |
Building Improvements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate property - accumulated depreciation |  |  | 125,599,000 |  |  |  |  |  | 204,420,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 125,599,000 | 204,420,000 |  |
MOBs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired or agreed to be acquired | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13 |  | 2 |
Number of buildings acquired | building |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13 |  | 5 |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 46,797,000 |  | $ 11,488,000 |
Leases committed expenditure |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 17,212,000 | $ 22,540,000 |  |
Area of real estate properties leased (in square feet) | ft² |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 881,502 | 1,300,000 |  |
MOBs | Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired real estate leases |  |  | $ 29,527,000 |  |  |  |  |  | $ 27,713,000 |  |  |  |  |  | $ 9,645,000 |  |  |  |  |  |  |  |  |  | $ 29,527,000 | $ 27,713,000 | $ 9,645,000 |
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired or agreed to be acquired | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 | 6 | 3 |
Area of real estate properties (in square feet) | ft² |  |  | 535,000 |  |  |  |  |  | 630,000 |  |  |  |  |  | 390,000 |  |  |  |  |  |  |  |  |  | 535,000 | 630,000 | 390,000 |
Purchase price, including closing costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 114,973,000 | $ 113,168,000 |  |
Mortgage debt assumed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,050,000 | 0 | $ 0 |
Purchase price excluding closing costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 86,432,000 |
Acquired real estate lease obligations |  |  | $ 0 |  |  |  |  |  | $ 20,000 |  |  |  |  |  | $ 1,091,000 |  |  |  |  |  |  |  |  |  | 0 | 20,000 | 1,091,000 |
MOBs | Acquisitions | Land |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Book Value of Collateral |  |  | 19,736,000 |  |  |  |  |  | 25,618,000 |  |  |  |  |  | 7,845,000 |  |  |  |  |  |  |  |  |  | 19,736,000 | 25,618,000 | 7,845,000 |
MOBs | Acquisitions | Buildings and Improvements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Book Value of Collateral |  |  | 65,710,000 |  |  |  |  |  | 59,857,000 |  |  |  |  |  | $ 70,033,000 |  |  |  |  |  |  |  |  |  | $ 65,710,000 | 59,857,000 | 70,033,000 |
MOBs | Acquisitions | 3 States |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired real estate leases |  |  |  |  |  |  |  | $ 20,220,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired or agreed to be acquired | property |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of buildings acquired | building |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Area of real estate properties (in square feet) | ft² |  |  |  |  |  |  |  | 400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price, including closing costs |  |  |  |  |  |  |  | $ 91,698,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition costs incurred |  |  |  |  |  |  |  | $ 544,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average amortization period |  |  |  |  |  |  |  | 5 years 3 months 18 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage debt assumed |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired real estate lease obligations |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
MOBs | Acquisitions | 3 States | Land |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Book Value of Collateral |  |  |  |  |  |  |  | 16,873,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
MOBs | Acquisitions | 3 States | Buildings and Improvements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Book Value of Collateral |  |  |  |  |  |  |  | $ 54,605,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
MOBs | Acquisitions | Virginia |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired real estate leases |  |  |  |  |  | $ 9,307,000 |  |  | $ 4,986,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,986,000 |  |
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired or agreed to be acquired | property |  |  |  |  |  | 1 |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of buildings acquired | building |  |  |  |  |  | 1 |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Area of real estate properties (in square feet) | ft² |  |  |  |  |  | 135,000 |  |  | 136,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 136,000 |  |
Purchase price, including closing costs |  |  |  |  |  | $ 23,275,000 |  |  | $ 15,844,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition costs incurred |  |  |  |  |  | $ 525,000 |  |  | $ 275,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average amortization period |  |  |  |  |  | 5 years 9 months 18 days |  |  | 7 years 2 months 12 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Above market, acquired lease amortization period |  |  |  |  |  |  |  |  | 6 years 1 month 6 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Below market, acquired lease amortization period |  |  |  |  |  |  |  |  | 6 years 9 months 18 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage debt assumed |  |  |  |  |  | $ 11,050,000 |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired real estate lease obligations |  |  |  |  |  | 0 |  |  | 20,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 20,000 |  |
MOBs | Acquisitions | Virginia | Land |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Book Value of Collateral |  |  |  |  |  | 2,863,000 |  |  | 3,263,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,263,000 |  |
MOBs | Acquisitions | Virginia | Buildings and Improvements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Book Value of Collateral |  |  |  |  |  | 11,105,000 |  |  | 7,615,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,615,000 |  |
MOBs | Acquisitions | Kansas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired real estate leases |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,338,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired or agreed to be acquired | property |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of buildings acquired | building |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Area of real estate properties (in square feet) | ft² |  |  |  |  |  |  |  |  |  |  |  |  |  | 117,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price, including closing costs |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 15,106,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition costs incurred |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 35,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average amortization period |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years 3 months 19 days |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage debt assumed |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired real estate lease obligations |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
MOBs | Acquisitions | Kansas | Land |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Book Value of Collateral |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,522,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
MOBs | Acquisitions | Kansas | Buildings and Improvements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Book Value of Collateral |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,246,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
MOBs | Acquisitions | Maryland |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired real estate leases |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,937,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired or agreed to be acquired | property |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of buildings acquired | building |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Area of real estate properties (in square feet) | ft² |  |  |  |  |  |  |  |  |  |  |  |  | 59,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price, including closing costs |  |  |  |  |  |  |  |  |  |  |  |  | $ 16,601,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition costs incurred |  |  |  |  |  |  |  |  |  |  |  |  | $ 383,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average amortization period |  |  |  |  |  |  |  |  |  |  |  |  | 3 years 9 months 18 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage debt assumed |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired real estate lease obligations |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
MOBs | Acquisitions | Maryland | Land |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Book Value of Collateral |  |  |  |  |  |  |  |  |  |  |  |  | 6,138,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
MOBs | Acquisitions | Maryland | Buildings and Improvements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Book Value of Collateral |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,526,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
MOBs | Acquisitions | 2 States |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired real estate leases |  |  |  |  |  |  |  |  |  |  | $ 7,016,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired or agreed to be acquired | property |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of buildings acquired | building |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Area of real estate properties (in square feet) | ft² |  |  |  |  |  |  |  |  |  |  | 255,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price, including closing costs |  |  |  |  |  |  |  |  |  |  | $ 38,794,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition costs incurred |  |  |  |  |  |  |  |  |  |  | $ 283,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average amortization period |  |  |  |  |  |  |  |  |  |  | 2 years 7 months 6 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage debt assumed |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired real estate lease obligations |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
MOBs | Acquisitions | 2 States | Land |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Book Value of Collateral |  |  |  |  |  |  |  |  |  |  | 6,738,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
MOBs | Acquisitions | 2 States | Buildings and Improvements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Book Value of Collateral |  |  |  |  |  |  |  |  |  |  | $ 25,040,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
MOBs | Acquisitions | California |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired real estate leases |  |  |  |  |  |  |  |  |  | $ 5,436,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired or agreed to be acquired | property |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of buildings acquired | building |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Area of real estate properties (in square feet) | ft² |  |  |  |  |  |  |  |  |  | 63,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price, including closing costs |  |  |  |  |  |  |  |  |  | $ 26,823,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition costs incurred |  |  |  |  |  |  |  |  |  | $ 323,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average amortization period |  |  |  |  |  |  |  |  |  | 8 years 8 months 12 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage debt assumed |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired real estate lease obligations |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
MOBs | Acquisitions | California | Land |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Book Value of Collateral |  |  |  |  |  |  |  |  |  | 7,957,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
MOBs | Acquisitions | California | Buildings and Improvements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Book Value of Collateral |  |  |  |  |  |  |  |  |  | $ 13,430,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
MOBs | Acquisitions | Minnesota |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired real estate leases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,053,000 |  |  |  |  |
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired or agreed to be acquired | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |
Number of buildings acquired | building |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |
Area of real estate properties (in square feet) | ft² |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 128,000 |  |  |  |  |
Weighted average amortization period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 years 4 months 24 days |  |  |  |  |
Below market, acquired lease amortization period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 years 3 months 19 days |  |  |  |  |
Mortgage debt assumed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |
Purchase price excluding closing costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 22,700,000 |  |  |  |  |
Acquired real estate lease obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,091,000 |  |  |  |  |
MOBs | Acquisitions | Minnesota | Land |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Book Value of Collateral |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,028,000 |  |  |  |  |
MOBs | Acquisitions | Minnesota | Buildings and Improvements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Book Value of Collateral |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 14,710,000 |  |  |  |  |
MOBs | Acquisitions | Florida |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired real estate leases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired or agreed to be acquired | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |
Number of buildings acquired | building |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |
Area of real estate properties (in square feet) | ft² |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 166,000 |  |  |  |  |  |  |  |
Purchase price, including closing costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 45,232,000 |  |  |  |  |  |  |  |
Acquisition costs incurred |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 232,000 |  |  |  |  |  |  |  |
Mortgage debt assumed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |
Acquired real estate lease obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |
MOBs | Acquisitions | Florida | Land |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Book Value of Collateral |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,792,000 |  |  |  |  |  |  |  |
MOBs | Acquisitions | Florida | Buildings and Improvements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Book Value of Collateral |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 42,440,000 |  |  |  |  |  |  |  |
MOBs | Acquisitions | Ohio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired real estate leases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,592,000 |  |  |  |  |  |  |  |  |  |  |  |
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired or agreed to be acquired | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |
Number of buildings acquired | building |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |
Area of real estate properties (in square feet) | ft² |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 96,000 |  |  |  |  |  |  |  |  |  |  |  |
Weighted average amortization period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14 years 1 month 6 days |  |  |  |  |  |  |  |  |  |  |  |
Mortgage debt assumed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |
Purchase price excluding closing costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Acquired real estate lease obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |
MOBs | Acquisitions | Ohio | Land |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Book Value of Collateral |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,025,000 |  |  |  |  |  |  |  |  |  |  |  |
MOBs | Acquisitions | Ohio | Buildings and Improvements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Book Value of Collateral |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 12,883,000 |  |  |  |  |  |  |  |  |  |  |  |
Senior Living Communities | Virginia |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of properties |  |  |  |  |  |  |  |  | 45,901,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale price of property sold and agreed to be sold |  |  |  |  |  |  |  |  | $ 55,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties sold | community |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Living Communities | Georgia |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of communities | community |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  |  |  |  |  |  |  |
Lease termination fee |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 115,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Living Communities | 4 States |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired or agreed to be acquired | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 |  |  |  |  |  |  |  |  |
Number of private pay independent living units | living_unit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 545 |  |  |  |  |  |  |  |  |
Purchase price excluding closing costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 112,350,000 |  |  |  |  |  |  |  |  |
Number of states in which properties are located | state |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |  |  |
Operating leases annual rent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,426,000 |  |  |  |  |  |  |  |  |
Senior Living Communities | Illinois |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired or agreed to be acquired | community |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of private pay independent living units | living_unit |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 126 |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price excluding closing costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 18,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Living Communities | California Colorado And Oregon |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired or agreed to be acquired | community |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 19,549,000 |  |  |
Senior Living Communities | Romeoville, IL |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of properties |  |  |  |  |  |  |  |  | $ 154,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Living Communities | Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired real estate leases |  |  | $ 11,489,000 |  |  |  |  |  |  |  |  |  |  |  | $ 3,723,000 |  |  |  |  |  |  |  |  |  | $ 11,489,000 |  | $ 3,723,000 |
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired or agreed to be acquired | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  | 10 |
Mortgage debt assumed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 33,336,000 |  | $ 0 |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units | living_unit |  |  | 366 |  |  |  |  |  |  |  |  |  |  |  | 709 |  |  |  |  |  |  |  |  |  | 366 |  | 709 |
Senior Living Communities | Acquisitions | Land |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Book Value of Collateral |  |  | $ 3,562,000 |  |  |  |  |  |  |  |  |  |  |  | $ 13,226,000 |  |  |  |  |  |  |  |  |  | $ 3,562,000 |  | $ 13,226,000 |
Senior Living Communities | Acquisitions | Buildings and Improvements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Book Value of Collateral |  |  | 49,917,000 |  |  |  |  |  |  |  |  |  |  |  | $ 114,512,000 |  |  |  |  |  |  |  |  |  | 49,917,000 |  | $ 114,512,000 |
Triple Net Leased Senior Living Communities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in annual lease rent payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,816,000 | 4,870,000 |  |
Number of communities | community |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,391,000 |
Real estate improvements by lessee purchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 23,376,000 | 51,952,000 |  |
Skilled Nursing Facility | North Carolina |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,365,000 |  |  |  |  |  |  |
Above Market Leases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired real estate leases |  |  | 35,056,000 |  |  |  |  |  | 40,540,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 35,056,000 | 40,540,000 |  |
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated amortization |  |  | 27,375,000 |  |  |  |  |  | 29,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 27,375,000 | 29,900,000 |  |
Leases, Acquired-in-Place |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired real estate leases |  |  | 656,163,000 |  |  |  |  |  | 750,527,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 656,163,000 | 750,527,000 |  |
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated amortization |  |  | 244,600,000 |  |  |  |  |  | $ 288,902,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 244,600,000 | 288,902,000 |  |
Five Star |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in annual lease rent payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,433,000 | 3,193,000 | 1,719,000 |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,082,000 |  |  |  |
Number of units | living_unit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 238
Real estate improvements by lessee purchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17,956,000 | 39,800,000 | $ 21,438,000 |
Five Star | Senior Living Communities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of pre-existing management agreements terminated | pooling_agreement | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |
Number of pre-existing management agreements | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |  |  |
Number of separate management agreements entered for communities acquired | pooling_agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 |  |  |  |  |  |  |  |  |
Five Star | Senior Living Communities | Florida |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price excluding closing costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 130,000 |  |  |  |  |  |  |  |  |  |  |
Increase in annual lease rent payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,000 |  |  |  |  |  |  |  |  |  |  |
Five Star | Senior Living Communities | Illinois |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired or agreed to be acquired | community |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in annual lease rent payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,395,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Five Star | Senior Living Communities | Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired or agreed to be acquired | property |  |  |  |  |  |  |  |  |  | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Five Star | Senior Living Communities | Acquisitions | Alabama and Indiana |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired or agreed to be acquired | property |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price, including closing costs |  |  |  |  |  |  |  |  | $ 39,457,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition costs incurred |  |  |  |  |  |  |  |  | $ 307,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of private pay independent living units | living_unit |  |  |  |  |  |  |  |  | 229 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Five Star | Senior Living Communities | Acquisitions | Tennessee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired or agreed to be acquired | community |  |  |  | 2 |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition costs incurred |  |  |  | $ 560,000 |  |  |  | $ 201,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage debt assumed |  |  |  | $ 16,588,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of private pay independent living units | living_unit |  |  |  | 151 |  |  |  | 88 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price excluding closing costs |  |  |  | $ 23,860,000 |  |  |  | $ 19,868,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Five Star | Senior Living Communities | Acquisitions | Arizona |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired or agreed to be acquired | community |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition costs incurred |  |  |  |  |  |  | $ 372,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage debt assumed |  |  |  |  |  |  | $ 16,748,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of private pay independent living units | living_unit |  |  |  |  |  |  | 127 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price excluding closing costs |  |  |  |  |  |  | $ 22,622,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Five Star | Senior Living Communities | Acquisitions | Delaware |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price excluding closing costs |  |  |  |  |  |  |  |  |  |  |  | $ 750,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in annual lease rent payable |  |  |  |  |  |  |  |  |  |  |  | $ 33,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Five Star | Land Parcel | Georgia |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price excluding closing costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |
TRS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |
TRS | Managed Senior Living Communities | Georgia |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired or agreed to be acquired | community |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |
Number of private pay independent living units | living_unit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 38 |  |  |  |  |  |  |  |
Purchase price excluding closing costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,400,000 |  |  |  |  |  |  |  |
Discontinued operations, disposed of by sale | California |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of properties |  |  |  | 2,150,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discontinued operations, disposed of by sale | MOBs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale price of property sold and agreed to be sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 20,150,000 |  |  |  |  |  |  |  |  |  |
Number of properties sold | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  |
Number of buildings sold | building |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  |
Discontinued operations, disposed of by sale | MOBs | Florida |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale price of property sold and agreed to be sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Discontinued operations, disposed of by sale | MOBs | Massachusetts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale price of property sold and agreed to be sold |  |  | $ 2,050,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties sold | community |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discontinued operations, disposed of by sale | MOBs | Pennsylvania |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale price of property sold and agreed to be sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties sold | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Discontinued operations, disposed of by sale | Skilled Nursing Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,061,000 |  |  |  |  |  |  |  |  |
Sale price of property sold and agreed to be sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 248,000 |  | $ 9,100,000 |  |  |  |  |  |  |  |  |
Discontinued operations, disposed of by sale | Land Parcel |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale price of property sold and agreed to be sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 700,000 |  |  |  |  |  |
Discontinued operations, disposed of by sale | Five Star |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in annual lease rent payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,000 |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | MOBs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of land parcels sold | parcel |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |
Number of communities sold | community |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Sunrise Senior Living LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of properties |  |  |  | 1,906,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale price of property sold and agreed to be sold |  |  |  | $ 21,865,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Sunrise Senior Living LLC | Senior Living Communities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of properties |  |  |  |  | $ 78,856,000 | $ 181,154,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of communities sold | community |  |  |  | 1 | 1 | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale price of property sold and agreed to be sold |  |  |  |  | $ 96,000,000 | $ 217,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Sunrise Senior Living LLC | Skilled Nursing Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties held for sale | nursing_facility |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental income |  |  |  | $ 650,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discontinued Operations, Held-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties held for sale | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  | 0 |
Real estate held for sale |  |  | $ 1,928,000 |  |  |  |  |  | $ 53,338,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,928,000 | $ 53,338,000 |  |
Discontinued Operations, Held-for-sale | Triple Net Leased Senior Living Communities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties held for sale | property |  |  | 2 |  |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 | 4 |  |
Number of units | living_unit |  |  | 1,295 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,295 |  |  |
Area of real estate properties leased (in square feet) | ft² |  |  | 32,604 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Below market lease, remaining amortization period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9 years 9 months 20 days |  |  |
Weighted Average | Above Market Leases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangibles, remaining amortization period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 years 4 months 8 days |  |  |
Weighted Average | Leases, Acquired-in-Place |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangibles, remaining amortization period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8 years 9 months 18 days |  |  |
Subsequent Event | Disposal Group, Disposed of by Sale, Not Discontinued Operations | MOBs | Florida |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of communities sold | community |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale price of property sold and agreed to be sold |  | $ 2,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | Disposal Group, Disposed of by Sale, Not Discontinued Operations | MOBs | Colorado |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of communities sold | community |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale price of property sold and agreed to be sold |  | $ 2,625,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

X
- Definition Acquired Above Market Lease Amortization Period + References No definition available. + Details
Name: | snh_AcquiredAboveMarketLeaseAmortizationPeriod
Namespace Prefix: | snh_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amortization period for leases with a finite life acquired as part of a real property acquisition at below market lease rate. + References No definition available. + Details
Name: | snh_AcquiredBelowMarketLeaseAmortizationPeriod
Namespace Prefix: | snh_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Acquisition Costs Incurred + References No definition available. + Details
Name: | snh_AcquisitionCostsIncurred
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Remaining amortization period of leases at below market lease rate with a finite life. + References No definition available. + Details
Name: | snh_BelowMarketLeaseRemainingAmortizationPeriod
Namespace Prefix: | snh_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition This element represents the aggregate purchase price of real estate properties acquired by the entity during the period. This amount includes cash paid plus debt assumed, if any, and other settlement adjustments but excludes closing costs. + References No definition available. + Details
Name: | snh_CashPaidPlusAssumedDebtExcludingClosingCostsPlusOtherSettlementAdjustments
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Cash Paid plus Assumed Debt, including closing costs plus other settlement adjustments + References No definition available. + Details
Name: | snh_CashPaidPlusAssumedDebtIncludingClosingCostsPlusOtherSettlementAdjustments
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the increase or decrease on the annual rent the lessee is obligated to pay on an operating lease. + References No definition available. + Details
Name: | snh_IncreaseDecreaseOperatingLeasesAnnualRent
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of committed but unspent tenant related obligations based on executed lease. + References No definition available. + Details
Name: | snh_LeaseCommittedButUnspentTenantRelatedObligations
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the amount of expenditure committed by entity relating to leases. + References No definition available. + Details
Name: | snh_LeasesCommittedExpenditure
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the number of private pay independent living units within communities acquired. + References No definition available. + Details
Name: | snh_NumberOfAcquiredPrivatePayIndependentLivingUnits
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of buildings acquired or agreed to be acquired by the entity. + References No definition available. + Details
Name: | snh_NumberOfBuildingsAcquired
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition This element represents the number of buildings sold by the entity. + References No definition available. + Details
Name: | snh_NumberOfBuildingsSold
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of communities. + References No definition available. + Details
Name: | snh_NumberOfCommunities
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of communities sold. + References No definition available. + Details
Name: | snh_NumberOfCommunitiesSold
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number Of Land Parcels Sold + References No definition available. + Details
Name: | snh_NumberOfLandParcelsSold
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of pre-existing management agreements. + References No definition available. + Details
Name: | snh_NumberOfPreExistingManagementAgreements
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of Pre-Existing Management Agreements Terminated + References No definition available. + Details
Name: | snh_NumberOfPreExistingManagementAgreementsTerminated
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of properties acquired or agreed to be acquired by the entity. + References No definition available. + Details
Name: | snh_NumberOfPropertiesAcquired
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition This element represents the number of properties sold or agreed to be sold by the entity. + References No definition available. + Details
Name: | snh_NumberOfPropertiesSold
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of real estate properties owned by the entity, which are classified as held for sale as of the balance sheet date. + References No definition available. + Details
Name: | snh_NumberOfRealEstatePropertiesHeldForSale
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the number of separate management agreements entered for communities acquired, upon termination of a pre-existing combined management agreement. + References No definition available. + Details
Name: | snh_NumberOfSeparateManagementAgreements
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of Real Estate Properties Sold + References No definition available. + Details
Name: | snh_NumberofRealEstatePropertiesSold
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition This element represents the aggregate sales price excluding closing costs, of real estate properties sold by the entity. + References No definition available. + Details
Name: | snh_RealEstateAggregateSalesPrice
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the amount of improvements to real estate properties made by lessees and purchased by the entity. + References No definition available. + Details
Name: | snh_RealEstateImprovementsByLesseePurchased
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the intangible lease assets recorded as part of the real estate acquisition. + References No definition available. + Details
Name: | snh_RealEstatePropertiesAcquiredIntangibleLeaseAssets
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the intangible lease liabilities recorded as part of the real estate acquisition. + References No definition available. + Details
Name: | snh_RealEstatePropertiesAcquiredIntangibleLeaseLiabilities
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the area of the real estate property subject to an operating lease. + References No definition available. + Details
Name: | snh_SquareFootageOfRealEstatePropertyLeased
Namespace Prefix: | snh_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | duration

X
- Definition Area of a real estate property. + References No definition available. + Details
Name: | us-gaap_AreaOfRealEstateProperty
Namespace Prefix: | us-gaap_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228 + Details
Name: | us-gaap_AssetImpairmentCharges
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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