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Summary of Intangible Assets Subject to Amortization in Period of Acquisition (Detail) (USD $) In Thousands, unless otherwise specified | 9 Months Ended
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Sep. 30, 2012 | Sep. 30, 2011
In-Place Leases [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Acquired finite lived intangible asset, fair value | $ 1,750 | $ 2,511
Acquired finite lived intangible asset, weighted average life | 118 months | 56 months
Tenant Relationships [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Acquired finite lived intangible asset, fair value | 1,012 | 1,553
Acquired finite lived intangible asset, weighted average life | 178 months | 116 months
Above Market Leases [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Acquired finite lived intangible asset, fair value |  | 2,883
Acquired finite lived intangible asset, weighted average life |  | 56 months
Below Market Leases [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Acquired finite lived intangible asset, fair value | $ (102) |
Acquired finite lived intangible asset, weighted average life | 118 months |

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- Definition The aggregate amount assigned to a major class of finite-lived intangible assets acquired either individually or as part of a group of assets (in either an asset acquisition or business combination). A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company. + 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)(1) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16265-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 44 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Period Type: | duration

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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=7658586&loc=d3e16265-109275 + Details
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Balance Type: | na
Period Type: | duration