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Real Estate Properties - Schedule of Purchase Price Allocations (Details) ft² in Thousands, $ in Thousands | 1 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2018 USD ($) ft² building property | Jan. 31, 2018 USD ($) ft² building property | Sep. 30, 2018 USD ($) ft² building property | Sep. 30, 2017 USD ($)
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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- Definition The amount of debt that an Entity assumes in acquiring a business or in consideration for an asset received in a noncash (or part noncash) acquisition. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 + Details
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