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Real Estate and Intangible Assets - Weighted Average Amortization Period for Intangible Assets Acquired and Liabilities Assumed (Detail) | 9 Months Ended
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Sep. 30, 2015 | Sep. 30, 2014
Acquired Finite-Lived Intangible Assets [Line Items] |  |
All intangible assets, Amortization Period (in Years) | 6 years 2 months 12 days | 4 years 2 months 12 days
In-place Leases [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
All intangible assets, Amortization Period (in Years) | 4 years 1 month 6 days | 3 years 8 months 12 days
Leasing Commissions [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
All intangible assets, Amortization Period (in Years) | 5 years 6 months | 6 years 3 months 18 days
Tenant Relationships [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
All intangible assets, Amortization Period (in Years) | 9 years 6 months | 6 years 10 months 24 days
Above-Market Lease Values [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
All intangible assets, Amortization Period (in Years) |  | 3 years
Above (Below)-Market Leases [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
All intangible assets, Amortization Period (in Years) |  | 1 year 6 months

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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- Details
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