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Summary of Disposition of Property's (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2017
Real Estate Properties [Line Items] |  |  |
Sale Price |  |  | $ 59,600
Gain (loss) on sale | [1] |  | 15,958
Net income (loss) allocable to common shares |  | $ (39) | $ 1,728
Copper Mill |  |  |
Real Estate Properties [Line Items] |  |  |
Date of Sale |  |  | May 05, 2017
Sale Price |  |  | $ 32,000
Gain (loss) on sale | [1] |  | 15,616
Net income (loss) allocable to common shares |  | (3) | $ 794
Heritage Trace |  |  |
Real Estate Properties [Line Items] |  |  |
Date of Sale |  |  | Jun. 01, 2017
Sale Price |  |  | $ 11,600
Gain (loss) on sale | [1] |  | (1,237)
Net income (loss) allocable to common shares |  | (3) | $ 477
Berkshire |  |  |
Real Estate Properties [Line Items] |  |  |
Date of Sale |  |  | Jun. 09, 2017
Sale Price |  |  | $ 16,000
Gain (loss) on sale | [1] |  | 1,579
Net income (loss) allocable to common shares |  | $ (33) | $ 457
[1] | The gain (loss) on sale for these properties is net of $2,748 of defeasance costs. All properties were previously classified as held for sale

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- Definition The net gain (loss) resulting from sales and other disposals of real estate owned for investment purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.14(d)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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