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Real Estate Acquired - Allocation of Purchase Prices to Acquired Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Land | $ 3,900 | $ 66,047 | $ 3,100
Buildings | $ 100 | 4,873 | $ 2,000
Below Market Rent |  | (5,069) |
Total Purchase Price |  | 67,950 |
In-Place Leases |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets |  | 2,099 |
Above Market Rents |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets |  | 0 |
1580 Rockville Pike |  |  |
Business Acquisition [Line Items] |  |  |
Land |  | 9,600 |
Buildings |  | 2,200 |
Below Market Rent |  | (4,313) |
Total Purchase Price |  | 8,000 |
1580 Rockville Pike | In-Place Leases |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets |  | 513 |
1580 Rockville Pike | Above Market Rents |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets |  | 0 |
1582 Rockville Pike |  |  |
Business Acquisition [Line Items] |  |  |
Land |  | 9,742 |
Buildings |  | 828 |
Below Market Rent |  | (419) |
Total Purchase Price |  | 11,000 |
1582 Rockville Pike | In-Place Leases |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets |  | 849 |
1582 Rockville Pike | Above Market Rents |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets |  | 0 |
750 N. Glebe Road |  |  |
Business Acquisition [Line Items] |  |  |
Land |  | 38,224 |
Buildings |  | 1,327 |
Below Market Rent |  | 0 |
Total Purchase Price |  | 40,000 |
750 N. Glebe Road | In-Place Leases |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets |  | 449 |
750 N. Glebe Road | Above Market Rents |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets |  | 0 |
730 N. Glebe Road |  |  |
Business Acquisition [Line Items] |  |  |
Land |  | 2,683 |
Buildings |  | 78 |
Below Market Rent |  | 0 |
Total Purchase Price |  | 2,800 |
730 N. Glebe Road | In-Place Leases |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets |  | 39 |
730 N. Glebe Road | Above Market Rents |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets |  | 0 |
1584 Rockville Pike |  |  |
Business Acquisition [Line Items] |  |  |
Land |  | 5,798 |
Buildings |  | 440 |
Below Market Rent |  | (337) |
Total Purchase Price |  | 6,150 |
1584 Rockville Pike | In-Place Leases |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets |  | 249 |
1584 Rockville Pike | Above Market Rents |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets |  | $ 0 |

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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=56956791&loc=d3e4845-128472 + Details
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