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Real Estate Acquired and Sold - Narrative (Details) | 1 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 USD ($) ft² | Mar. 31, 2017 USD ($) | Jan. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) ft² | Nov. 30, 2016 USD ($) | Aug. 31, 2016 USD ($) property | Sep. 30, 2017 USD ($) ft² property | Sep. 30, 2016 USD ($) | Dec. 31, 2016 USD ($) ft² property
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Aggregate cost |  |  |  |  |  |  | $ 76,400,000 |  | $ 10,300,000
Property acquisition costs |  |  |  | $ 60,400 |  |  |  |  | $ 60,400
Rent expense |  |  |  |  |  |  | $ 578,200 | $ 617,100 |
Number of properties purchased | property |  |  |  |  |  |  | 1 |  | 2
Portion of purchase price allocated to land | $ 28,400,000 |  |  | 9,400,000 |  |  | $ 28,400,000 |  | $ 9,400,000
Portion of purchase price allocated to buildings | 45,800,000 |  |  | 900,000 |  |  | 45,800,000 |  | 900,000
Portion of purchase price allocated to leases acquired in place | 2,200,000 |  |  | 100,000 |  |  | 2,200,000 |  | 100,000
Portion of purchase price allocated to below market lease | (600,000) |  |  | (100,000) |  |  | (600,000) |  | $ (100,000)
Portion of purchase price allocated to above market lease | 600,000 |  |  |  |  |  | $ 600,000 |  |
Crosstown Business Center |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from sale of real estate |  |  |  | $ 5,400,000 |  |  |  |  |
Area of real estate property (in square feet) | ft² |  |  |  | 197,100 |  |  |  |  | 197,100
Gains (losses) on sales of investment real estate |  |  |  | $ 1,000,000 |  |  |  |  |
Great Eastern Shopping Center |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from sale of real estate | $ 8,500,000 |  |  |  |  |  |  |  |
Area of real estate property (in square feet) | ft² | 255,400 |  |  |  |  |  | 255,400 |  |
Gains (losses) on sales of investment real estate | $ 500,000 |  |  |  |  |  |  |  |
700 N. Glebe Road |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Aggregate cost |  |  |  |  |  | $ 7,200,000 |  |  |
Number of contiguous properties | property |  |  |  |  |  | 3 |  |  |
Thruway Pad |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Aggregate cost |  |  |  |  |  | $ 3,100,000 |  |  |
Property acquisition costs |  |  |  |  |  | $ 60,400 |  |  |
Beacon Center |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Aggregate cost |  |  |  |  | $ 22,500,000 |  |  |  |
Rent expense |  |  |  |  | 60,000 |  |  |  |
Mortgage loans on real estate, period increase (decrease) |  |  |  |  | 11,250,000 |  |  |  |
Southdale |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Aggregate cost |  |  |  |  | 15,000,000 |  |  |  |
Rent expense |  |  |  |  | $ 60,000 |  |  |  |
Burtonsville Town Square |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Aggregate cost |  |  | $ 76,400,000 |  |  |  |  |  |
Olney |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Aggregate cost |  | $ 3,000,000 |  |  |  |  |  |  |
Rent expense |  | $ 56,000 |  |  |  |  |  |  |
Great Eastern Shopping Center |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Second trust financing | $ 1,275,000 |  |  |  |  |  | $ 1,275,000 |  |
Second trust financing, stated interest rate | 6.00% |  |  |  |  |  |  |  |
Optional extension period | 6 months |  |  |  |  |  |  |  |

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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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