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Summary of Revenue And Net Income (Loss) for Properties Acquired (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2017
Business Acquisition Pro Forma Information Nonrecurring Adjustment [Line Items]
Total revenue	$ 2,401	$ 3,636
Net income (loss) allocable to common shares	606	907
Lakes of Northdale
Business Acquisition Pro Forma Information Nonrecurring Adjustment [Line Items]
Total revenue	789	1,829
Net income (loss) allocable to common shares	223	447
Haverford Place
Business Acquisition Pro Forma Information Nonrecurring Adjustment [Line Items]
Total revenue	452	637
Net income (loss) allocable to common shares	107	179
South Terrace
Business Acquisition Pro Forma Information Nonrecurring Adjustment [Line Items]
Total revenue	1,039	1,049
Net income (loss) allocable to common shares	198	203
Cherry Grove
Business Acquisition Pro Forma Information Nonrecurring Adjustment [Line Items]
Total revenue	26	26
Net income (loss) allocable to common shares	17	17
Riverchase
Business Acquisition Pro Forma Information Nonrecurring Adjustment [Line Items]
Total revenue	25	25
Net income (loss) allocable to common shares	13	13
Kensington
Business Acquisition Pro Forma Information Nonrecurring Adjustment [Line Items]
Total revenue	35	35
Net income (loss) allocable to common shares	25	25
Schirm Farms
Business Acquisition Pro Forma Information Nonrecurring Adjustment [Line Items]
Total revenue	35	35
Net income (loss) allocable to common shares	$ 23	$ 23

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- Definition

This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

+ References

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)(1)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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- Definition

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-Name Accounting Standards Codification
-Topic 805
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