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Real Estate Properties - Schedule of Purchase Price Allocations (Details) ft² in Thousands, $ in Thousands | 1 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2018 USD ($) ft² building property | Jan. 31, 2018 USD ($) ft² building property | Jun. 30, 2018 USD ($) ft² building property | Jun. 30, 2017 USD ($)
Real Estate [Line Items] |  |  |  |
Assumed Debt |  |  | $ 44,386 | $ 0
Acquisition | MOBs |  |  |  |
Real Estate [Line Items] |  |  |  |
Number of Properties | property |  |  | 4 |
Number of Buildings | building |  |  | 4 |
Area of real estate properties (in square feet) | ft² |  |  | 535 |
Cash Paid Plus Assumed Debt |  |  | $ 114,973 |
Acquired Real Estate Intangible Assets |  |  | 29,527 |
Assumed Debt |  |  | 11,050 |
Kansas, Missouri And California | Acquisition | MOBs |  |  |  |
Real Estate [Line Items] |  |  |  |
Number of Properties | property |  | 3 |  |
Number of Buildings | building |  | 3 |  |
Area of real estate properties (in square feet) | ft² |  | 400 |  |
Cash Paid Plus Assumed Debt |  | $ 91,698 |  |
Acquired Real Estate Intangible Assets |  | 20,220 |  |
Assumed Debt |  | 0 |  |
Virginia | Acquisition | MOBs |  |  |  |
Real Estate [Line Items] |  |  |  |
Number of Properties | property | 1 |  |  |
Number of Buildings | building | 1 |  |  |
Area of real estate properties (in square feet) | ft² | 135 |  |  |
Cash Paid Plus Assumed Debt | $ 23,275 |  |  |
Acquired Real Estate Intangible Assets | 9,307 |  |  |
Assumed Debt | 11,050 |  |  |
Land | Acquisition | MOBs |  |  |  |
Real Estate [Line Items] |  |  |  |
Real estate properties acquired, property plant and equipment |  |  | 19,736 |
Land | Kansas, Missouri And California | Acquisition | MOBs |  |  |  |
Real Estate [Line Items] |  |  |  |
Real estate properties acquired, property plant and equipment |  | 16,873 |  |
Land | Virginia | Acquisition | MOBs |  |  |  |
Real Estate [Line Items] |  |  |  |
Real estate properties acquired, property plant and equipment | 2,863 |  |  |
Building and Improvements | Acquisition | MOBs |  |  |  |
Real Estate [Line Items] |  |  |  |
Real estate properties acquired, property plant and equipment |  |  | $ 65,710 |
Building and Improvements | Kansas, Missouri And California | Acquisition | MOBs |  |  |  |
Real Estate [Line Items] |  |  |  |
Real estate properties acquired, property plant and equipment |  | $ 54,605 |  |
Building and Improvements | Virginia | Acquisition | MOBs |  |  |  |
Real Estate [Line Items] |  |  |  |
Real estate properties acquired, property plant and equipment | $ 11,105 |  |  |
Lease Agreements | Acquisition | MOBs |  |  |  |
Real Estate [Line Items] |  |  |  |
Weighted average amortization period |  |  | 5 years 9 months 18 days |

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