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Pro Forma of Financial Information Purport to Represent Result of Operations (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Real Estate Properties Base Purchase Price [Abstract] |  |  |  |
Pro forma total revenue (unaudited) | $ 43,421 | $ 42,695 | $ 128,834 | $ 128,350
Pro forma net income (loss) allocable to common shares (unaudited) | $ 2,347 | $ 3,211 | $ 27,663 | $ 34,012
Earnings (loss) per share attributable to common shareholders: |  |  |  |
Basic-pro forma (unaudited) | $ 0.03 | $ 0.07 | $ 0.40 | $ 0.72
Diluted-pro forma (unaudited) | $ 0.03 | $ 0.07 | $ 0.39 | $ 0.72

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- Definition The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a 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)(2)-(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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