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Summary of Revenue And Net Income (Loss) for Properties Acquired (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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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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