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Investment in Real Estate Investment in Real Estate - Fair Value Measurements on Non-Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Fair Value Assets Measured On Nonrecurring Basis [Line Items] |  |  |  |
Total Impairment | $ 0 | $ (1,605) | $ 0 | $ (1,605)
Fair Value, Measurements, Nonrecurring |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis [Line Items] |  |  |  |
Sold Operating Properties |  | 6,993 |  | 6,993
Fair Value, Measurements, Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis [Line Items] |  |  |  |
Sold Operating Properties |  | 0 |  | 0
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2) |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis [Line Items] |  |  |  |
Sold Operating Properties |  | 0 |  | 0
Fair Value, Measurements, Nonrecurring | Unobservable Inputs (Level 3) |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis [Line Items] |  |  |  |
Sold Operating Properties |  | $ 6,993 |  | $ 6,993

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- Definition Fair value portion of assets classified as held for sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19190-110258 + Details
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