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Real Estate and Intangible Assets - Additional Information (Detail) (USD $)
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3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 0 Months Ended | 9 Months Ended | 0 Months Ended | 9 Months Ended | 0 Months Ended | 9 Months Ended | 0 Months Ended | 9 Months Ended | 0 Months Ended | 9 Months Ended | 0 Months Ended | 9 Months Ended | 1 Months Ended | 9 Months Ended | |||
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Sep. 30, 2013
Property
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Sep. 30, 2012
Property
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Sep. 30, 2013
Property
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Sep. 30, 2012
Property
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Sep. 30, 2013
One Properties Acquired [Member]
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Sep. 30, 2013
One Properties Acquired [Member]
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Jan. 14, 2013
Champaign, Illinois [Member]
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Sep. 30, 2013
Champaign, Illinois [Member]
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Aug. 07, 2013
South Hadley Massachusetts [Member]
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Sep. 30, 2013
South Hadley Massachusetts [Member]
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Aug. 15, 2013
Lexington North Carolina [Member]
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Sep. 30, 2013
Lexington North Carolina [Member]
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Aug. 15, 2013
Crenshaw Pennsylvania [Member]
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Sep. 30, 2013
Crenshaw Pennsylvania [Member]
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Apr. 11, 2013
WISCONSIN [Member]
sqft
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Sep. 30, 2013
WISCONSIN [Member]
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Apr. 10, 2013
OHIO [Member]
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Sep. 30, 2013
OHIO [Member]
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Jul. 17, 2013
Hazelwood, Missouri [Member]
Option
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Sep. 30, 2013
Hazelwood, Missouri [Member]
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Sep. 30, 2013
Dayton, Ohio Office Building [Member]
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| Operating Leased Assets [Line Items] | |||||||||||||||||||||
| Number of properties acquired | 5 | 6 | 5 | 6 | |||||||||||||||||
| Number of properties expanded | 1 | ||||||||||||||||||||
| Acquisition-related costs excluded in pro-forma earnings | $ 163,000 | $ 117,000 | $ 622,000 | $ 805,000 | $ 200,000 | $ 600,000 | |||||||||||||||
| Total annual property taxes for all properties not paid by tenants | 10,200,000 | ||||||||||||||||||||
| Option to extend lease term | 11 years | ||||||||||||||||||||
| Period for lease expiration | 2013-12 | ||||||||||||||||||||
| Extended lease expiration month year | 2024-12 | ||||||||||||||||||||
| Amount of annualized straight line rents over the life of the lease | 1,400,000 | ||||||||||||||||||||
| Leasing commission paid | 1,008,000 | 1,538,000 | 400,000 | 200,000 | 400,000 | 100,000 | |||||||||||||||
| Lease expiration date, extended | 2015-01 | 2026-04 | 2026-04 | 2028-10 | 2024-01 | ||||||||||||||||
| Lease expiration period, month and year | 2014-01 | 2014-04 | 2014-04 | 2020-10 | 2014-01 | 2023-05 | |||||||||||||||
| Extended additional period of lease | 1 year | 12 years | 12 years | 8 years | 10 years | ||||||||||||||||
| Annualized straight line rent escalations | 300,000 | 400,000 | 700,000 | 1,000,000 | 300,000 | 200,000 | |||||||||||||||
| Tenant allowance | 3,400 | 50,000 | 80,000 | 500,000 | |||||||||||||||||
| Expansion of our property, value | 3,300,000 | ||||||||||||||||||||
| Expansion of our property, area | 102,400 | ||||||||||||||||||||
| Rental income revised | 600,000 | ||||||||||||||||||||
| Lease Expiration Date | Jun. 30, 2015 | ||||||||||||||||||||
| Lease commencement date | Aug. 01, 2013 | ||||||||||||||||||||
| Amount paid for tenant improvements | $ 300,000 | ||||||||||||||||||||
| Number of options to purchase property | 2 | ||||||||||||||||||||
| Date of option to purchase property one | 2017-03 | ||||||||||||||||||||
| Date of option to purchase property second | 2023-05 | ||||||||||||||||||||