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Real Estate Acquired - Allocation of Purchase Prices to Acquired Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2014
--- | --- | ---
Business Acquisition [Line Items] |  |
Land | $ 9,432 | $ 66,047
Buildings | 874 | 4,873
Below Market Rent | (63) | (5,069)
Total Purchase Price | 10,336 | 67,950
In-place Leases |  |
Business Acquisition [Line Items] |  |
Intangible assets | 93 | 2,099
Above Market Rent |  |
Business Acquisition [Line Items] |  |
Intangible assets | 0 | 0
700 N. Glebe Road |  |
Business Acquisition [Line Items] |  |
Land | 7,236 |
Buildings | 0 |
Below Market Rent | 0 |
Total Purchase Price | 7,236 |
700 N. Glebe Road | In-place Leases |  |
Business Acquisition [Line Items] |  |
Intangible assets | 0 |
700 N. Glebe Road | Above Market Rent |  |
Business Acquisition [Line Items] |  |
Intangible assets | 0 |
Thruway Pad |  |
Business Acquisition [Line Items] |  |
Land | 2,196 |
Buildings | 874 |
Below Market Rent | (63) |
Total Purchase Price | 3,100 |
Thruway Pad | In-place Leases |  |
Business Acquisition [Line Items] |  |
Intangible assets | 93 |
Thruway Pad | Above Market Rent |  |
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 Rent |  |
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 Rent |  |
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 Rent |  |
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 Rent |  |
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 Rent |  |
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=73530397&loc=d3e4845-128472 + Details
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