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Real Estate Acquired and Sold - Narrative (Details) | 1 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2015 USD ($) ft² | Feb. 28, 2015 USD ($) a | Dec. 31, 2014 USD ($) property | Aug. 31, 2014 USD ($) | Apr. 30, 2014 USD ($) ft² | Jan. 31, 2014 USD ($) | Sep. 30, 2015 USD ($) ft² | Dec. 31, 2014 USD ($) property | Mar. 31, 2014 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Aggregate cost |  |  |  |  |  |  |  | $ 68,000,000 |
Property acquisition costs |  |  | $ 900,000 |  |  |  |  | $ 900,000 |
Area of real estate property (in sq ft/acre) | ft² | 197,127 |  |  |  |  |  | 197,127 |  |
Number of properties purchased | property |  |  | 5 |  |  |  |  | 5 |
Olney Center |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Name of property |  |  |  |  | Olney Center |  |  |  |
Location of property |  |  |  |  | Olney, Maryland |  |  |  |
Proceeds from sale of real estate |  |  |  |  | $ 11,000,000 |  | $ 11,000,000 |  |
Area of real estate property (in sq ft/acre) | ft² |  |  |  |  | 53,765 |  |  |  |
Lease term |  |  |  |  | 20 years |  |  |  |
Sale leaseback, option to purchase the property | $ 14,600,000 |  |  |  | $ 14,600,000 |  | 14,600,000 |  |
Sales price of property | 11,000,000 |  |  |  |  |  | $ 11,000,000 |  |
Annual increase in rental payments, percentage |  |  |  |  |  |  | 1.50% |  |
Giant Center |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Name of property |  |  |  |  | Giant Center |  |  |  |
Location of property |  |  |  |  | Milford Mill, Maryland |  |  |  |
Proceeds from sale of real estate |  |  |  |  | $ 7,500,000 |  |  |  |
Area of real estate property (in sq ft/acre) | ft² |  |  |  |  | 70,040 |  |  |  |
Gain on sale of real estate |  |  |  |  | $ 6,100,000 |  |  |  |
Assets held-for-sale |  |  |  |  |  |  |  |  | $ 500,000
Liabilities of assets held-for-sale |  |  |  |  |  |  |  |  | $ 100,000
1580 Rockville Pike |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Aggregate cost |  |  |  |  |  | $ 8,000,000 |  |  |
Name of property |  |  |  |  |  | 1580 Rockville Pike |  |  |
Property acquisition costs |  |  |  |  |  | $ 200,000 |  |  |
1582 Rockville Pike |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Aggregate cost |  |  |  |  | $ 11,000,000 |  |  |  |
Name of property |  |  |  |  | 1582 Rockville Pike |  |  |  |
Property acquisition costs |  |  |  |  | $ 200,000 |  |  |  |
Location of property |  |  |  |  | Rockville, Maryland |  |  |  |
1584 Rockville Pike |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Aggregate cost |  |  | $ 6,200,000 |  |  |  |  |  |
Name of property |  |  | 1584 Rockville Pike |  |  |  |  |  |
Property acquisition costs |  |  | $ 200,000 |  |  |  |  | $ 200,000 |
750 N. Glebe Road |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Aggregate cost |  |  |  | $ 40,000,000 |  |  |  |  |
Name of property |  |  |  | 750 N. Glebe Road |  |  |  |  |
Property acquisition costs |  |  |  | $ 400,000 |  |  |  |  |
730 N. Glebe Road |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Aggregate cost |  |  | $ 2,800,000 |  |  |  |  |  |
Name of property |  |  | 730 N. Glebe Road |  |  |  |  |  |
Property acquisition costs |  |  | $ 40,400 |  |  |  |  | $ 40,400 |
726 N. Glebe Road |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Aggregate cost | $ 4,000,000 |  |  |  |  |  |  |  |
Name of property | 726 N. Glebe Road |  |  |  |  |  |  |  |
Property acquisition costs | $ 56,700 |  |  |  |  |  | $ 56,700 |  |
Westview Pad |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Aggregate cost |  | $ 900,000 |  |  |  |  |  |  |
Name of property |  | Westview Pad |  |  |  |  |  |  |
Location of property |  | Frederick, Maryland |  |  |  |  |  |  |
Area of real estate property (in sq ft/acre) | a |  | 1.1 |  |  |  |  |  |  |

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