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Real Estate Acquired - Allocation of Purchase Prices to Acquired Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
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Business Acquisition [Line Items] |  |  |
Land | $ 2,300 | $ 30,400 |
Buildings | 2,000 | 3,800 |
Below Market Rents |  | (700) | (5,500)
In-Place Leases |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets |  | 500 |
Above Market Rents |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets |  |  | 28
Kentlands Square II |  |  |
Business Acquisition [Line Items] |  |  |
Land | 20,500 |  |
Buildings | 51,973 |  |
Below Market Rents | (676) |  |
Total Purchase Price | 74,500 |  |
Kentlands Square II | In-Place Leases |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets | 2,697 |  |
Kentlands Square II | Above Market Rents |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets | 6 |  |
Severna Park Market Place |  |  |
Business Acquisition [Line Items] |  |  |
Land | 12,700 |  |
Buildings | 50,554 |  |
Below Market Rents | (4,691) |  |
Total Purchase Price | 61,000 |  |
Severna Park Market Place | In-Place Leases |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets | 2,433 |  |
Severna Park Market Place | Above Market Rents |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets | 4 |  |
Cranberry Square |  |  |
Business Acquisition [Line Items] |  |  |
Land | 6,700 |  |
Buildings | 24,878 |  |
Below Market Rents | (95) |  |
Total Purchase Price | 33,000 |  |
Cranberry Square | In-Place Leases |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets | 1,499 |  |
Cranberry Square | Above Market Rents |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets | 18 |  |
Three Property |  |  |
Business Acquisition [Line Items] |  |  |
Land | 39,900 |  |
Buildings | 127,405 |  |
Below Market Rents | (5,462) |  |
Total Purchase Price | 168,500 |  |
Three Property | In-Place Leases |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets | 6,629 |  |
Three Property | Above Market Rents |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets | $ 28 |  |

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- Definition Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Below Market Lease + References No definition available. + Details
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- Details
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- Definition Amount of facility held for productive use including, but not limited to, office, production, storage and distribution facilities, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition The amount of identifiable intangible assets recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=25498275&loc=d3e2207-128464 + Details
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- Definition Amount of real estate acquired, at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=25498275&loc=d3e2207-128464 + Details
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