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Real Estate Acquired and Sold - Narrative (Details) | 1 Months Ended | 9 Months Ended
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Aug. 31, 2016 USD ($) | Sep. 30, 2015 USD ($) | Feb. 28, 2015 USD ($) a | Sep. 30, 2016 USD ($) ft² property
Business Acquisition [Line Items] |  |  |  |
Aggregate cost |  |  |  | $ 10,300,000
Property acquisition costs |  |  |  | $ 57,000
Area of real estate property (in acres) | ft² |  |  |  | 197,127
Number of properties purchased | property |  |  |  | 2
Portion of purchase price allocated to land |  |  |  | $ 9,400,000
Portion of purchase price allocated to buildings |  |  |  | 900,000
Portion of purchase price allocated to leases acquired in place |  |  |  | 100,000
Portion of purchase price allocated to below market lease |  |  |  | $ (100,000)
726 N. Glebe Road |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Aggregate cost |  | $ 4,000,000 |  |
Property acquisition costs |  | $ 56,700 |  |
700 N. Glebe Road |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Aggregate cost | $ 7,200,000 |  |  |
Westview Pad |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Aggregate cost |  |  | $ 900,000 |
Area of real estate property (in acres) | a |  |  | 1.1 |
Thruway Pad |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Aggregate cost | 3,100,000 |  |  |
Property acquisition costs | $ 57,000 |  |  |

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