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Real Estate Acquired and Sold - Narrative (Details)	1 Months Ended
	Sep. 30, 2015 USD ($)	Feb. 28, 2015 USD ($) a	Jun. 30, 2016 ft²
Business Acquisition [Line Items]
Area of real estate property (in acres) | ft²			197,127
726 N. Glebe Road
Business Acquisition [Line Items]
Aggregate cost	$ 4,000,000
Property acquisition costs	$ 56,700
Westview Pad
Business Acquisition [Line Items]
Aggregate cost		$ 900,000
Area of real estate property (in acres) | a		1.1

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Area of a real estate property.

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Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition.

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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

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