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Investment in Real Estate - Fair Value Measurements on Non-Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Fair Value Assets Measured On Nonrecurring Basis [Line Items] |  |  |  |  |  |
Total Impairment | $ 0 | $ (1,047) |  | $ 0 | $ (1,047) | [1]
Fair Value, Measurements, Nonrecurring |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis [Line Items] |  |  |  |  |  |
Operating Property Not Held for Sale |  | 6,875 | [1] |  | 6,875 | [1]
Fair Value, Measurements, Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis [Line Items] |  |  |  |  |  |
Operating Property Not Held for Sale |  | 0 |  |  | 0 |
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2) |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis [Line Items] |  |  |  |  |  |
Operating Property Not Held for Sale |  | 0 |  |  | 0 |
Fair Value, Measurements, Nonrecurring | Unobservable Inputs (Level 3) |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis [Line Items] |  |  |  |  |  |
Operating Property Not Held for Sale |  | $ 6,875 | [1] |  | $ 6,875 | [1]
[1] | Excludes industrial properties for which impairment of $1,605 was recorded during the nine months ended September 30, 2013 since the related assets were sold or recorded at carrying value, which is lower than estimated fair value at September 30, 2013.

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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Balance Type: | debit
Period Type: | instant

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- Definition The loss (gain) resulting from the write-down of the carrying value of assets classified as a disposal group, but one which is not further classified as a discontinued operation, to fair value less cost to sell. A (gain) results from a subsequent increase in fair value less cost to sell, but not in excess of the cumulative loss previously recognized. For example, the write-down of a disposal group subject to a plan of sale, which was not sold in the current period, to its held-for-sale value. The loss (gain) is included in income from continuing operations before income taxes in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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Period Type: | duration