Real Estate Investments - Summary of Consolidated and Combined Results of Operations on Pro Forma Basis (Detail) (Dimmock Square [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Dimmock Square [Member]
Business Acquisition [Line Items]
Rental revenues	$ 16,952	$ 15,409	$ 48,479	$ 44,059
Net income	$ 3,316	$ 1,329	$ 8,135	$ 11,527

The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(2)-(3)

-URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration