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Real Estate Acquired - Additional Information (Detail) (USD $) | 12 Months Ended |  | 12 Months Ended | 1 Months Ended |  | 1 Months Ended |  | 1 Months Ended |  | 1 Months Ended
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Dec. 31, 2013 Property | Dec. 31, 2012 Property | Dec. 31, 2011 Property | Dec. 31, 2012 In-Place Leases | Dec. 31, 2013 Above Market Leases | Dec. 31, 2012 Above Market Leases | Dec. 31, 2011 Above Market Leases | Dec. 31, 2013 Lease Acquisition Costs | Dec. 31, 2012 Lease Acquisition Costs | Dec. 31, 2011 Lease Acquisition Costs | Feb. 28, 2011 4469 Connecticut Avenue | Sep. 30, 2011 Kentlands Square II | Dec. 31, 2013 Kentlands Square II | Dec. 31, 2013 Kentlands Square II In-Place Leases | Dec. 31, 2013 Kentlands Square II Above Market Leases | Sep. 30, 2011 Severna Park Market Place | Dec. 31, 2013 Severna Park Market Place | Dec. 31, 2013 Severna Park Market Place In-Place Leases | Dec. 31, 2013 Severna Park Market Place Above Market Leases | Sep. 30, 2011 Cranberry Square | Dec. 31, 2013 Cranberry Square | Dec. 31, 2013 Cranberry Square In-Place Leases | Dec. 31, 2013 Cranberry Square Above Market Leases | Dec. 31, 2012 1500 Rockville Pike | Dec. 31, 2012 5541 Nicholson Lane | Aug. 31, 2013 Kentlands Pad sqft | Dec. 31, 2013 Hunt Club Pad sqft
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Year of acquisition |  |  |  |  |  |  |  |  |  |  | Feb. 28, 2011 | Sep. 30, 2011 |  |  |  | Sep. 30, 2011 |  |  |  | Sep. 30, 2011 |  |  |  | Dec. 31, 2012 | Dec. 31, 2012 | Aug. 31, 2013 | Dec. 31, 2013
Aggregate cost | $ 4,300,000 | $ 34,100,000 | $ 170,100,000 |  |  |  |  |  |  |  | $ 1,600,000 | $ 74,500,000 |  |  |  | $ 61,000,000 |  |  |  | $ 33,000,000 |  |  |  | $ 22,400,000 | $ 11,700,000 | $ 4,300,000 | $ 800,000
Name of property |  |  |  |  |  |  |  |  |  |  | 4469 Connecticut Avenue | Kentlands Square II |  |  |  | Severna Park MarketPlace |  |  |  | Cranberry Square |  |  |  | 1500 Rockville Pike | 5541 Nicholson Lane |  |
Location |  |  |  |  |  |  |  |  |  |  | Washington, DC | Gaithersburg, Maryland |  |  |  | Severna Park, Maryland |  |  |  | Westminster, Maryland |  |  |  | Rockville, Maryland | Rockville, Maryland | Gaithersburg, Maryland |
Property acquisition costs | 106,000 | 1,100,000 | 2,500,000 |  |  |  |  |  |  |  | 74,000 | 1,100,000 |  |  |  | 800,000 |  |  |  | 500,000 |  |  |  | 600,000 | 500,000 | 99,000 |
Area of real estate property (in square feet) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,100 | 5,500
Number of properties acquired | 1 | 2 | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocated to buildings | 2,000,000 | 3,800,000 |  |  |  |  |  |  |  |  |  |  | 51,973,000 |  |  |  | 50,554,000 |  |  |  | 24,878,000 |  |  |  |  |  |
Purchase price allocated to land | 2,300,000 | 30,400,000 |  |  |  |  |  |  |  |  |  |  | 20,500,000 |  |  |  | 12,700,000 |  |  |  | 6,700,000 |  |  |  |  |  |
Purchase price allocated to leases |  |  |  | 500,000 |  |  | 28,000 |  |  |  |  |  |  | 2,697,000 | 6,000 |  |  | 2,433,000 | 4,000 |  |  | 1,499,000 | 18,000 |  |  |  |
Purchase price allocated to below market lease |  | 700,000 | 5,500,000 |  |  |  |  |  |  |  |  |  | 676,000 |  |  |  | 4,691,000 |  |  |  | 95,000 |  |  |  |  |  |
Business acquisition, intangible asset estimated useful life |  | 3 years 1 month 6 days | 10 years 10 months 24 days |  |  |  | 4 years 1 month 6 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets gross carrying amount |  |  |  |  | 1,000,000 | 1,000,000 |  | 21,900,000 | 21,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets, accumulated amortization |  |  |  |  | 974,100 | 929,100 |  | 16,700,000 | 14,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization expense of intangible assets |  |  |  |  | 45,000 | 60,000 | 62,000 | 2,000,000 | 2,000,000 | 1,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible liabilities gross carrying amount | 24,800,000 | 24,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible liabilities, accumulated amortization | 10,000,000 | 8,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accretion income, intangible liabilities | $ 1,700,000 | $ 1,600,000 | $ 1,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + 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 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e6927-128479 + 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 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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