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Real Estate and Intangible Assets - Additional Information (Detail) (USD $)
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12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | |||||
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Dec. 31, 2013
Property
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Dec. 31, 2012
Property
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Dec. 31, 2011
Property
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Jan. 14, 2013
Champaign, Illinois [Member]
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Dec. 31, 2013
Champaign, Illinois [Member]
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Apr. 10, 2013
Ohio [Member]
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Dec. 31, 2013
Ohio [Member]
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Apr. 11, 2013
Wisconsin [Member]
sqft
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Dec. 31, 2013
Wisconsin [Member]
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Dec. 31, 2013
Dayton, Ohio Office Building [Member]
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Aug. 07, 2013
South Hadley Massachusetts [Member]
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Dec. 31, 2013
South Hadley Massachusetts [Member]
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Aug. 15, 2013
Lexington North Carolina [Member]
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Dec. 31, 2013
Lexington North Carolina [Member]
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Aug. 15, 2013
Crenshaw Pennsylvania [Member]
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Dec. 31, 2013
Crenshaw Pennsylvania [Member]
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Nov. 11, 2013
Canton North Carolina [Member]
sqft
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Dec. 31, 2013
Canton North Carolina [Member]
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Jul. 17, 2013
Hazelwood, Missouri [Member]
Option
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Dec. 31, 2013
Hazelwood, Missouri [Member]
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Dec. 31, 2013
2013 Real Estate Activity [Member]
Property
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Dec. 31, 2012
2012 Real Estate Activity [Member]
Property
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| Operating Leased Assets [Line Items] | ||||||||||||||||||||||
| Number of properties acquired | 7 | 8 | 7 | 7 | 8 | |||||||||||||||||
| Number of properties expanded | 1 | |||||||||||||||||||||
| 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 | 1,041,000 | 1,738,000 | 6,000 | 400,000 | 200,000 | 400,000 | 100,000 | |||||||||||||||
| Extended additional period of lease | 10 years | 8 years | 1 year | 12 years | 12 years | |||||||||||||||||
| Lease expiration date, extended | 2024-01 | 2028-10 | 2015-01 | 2026-04 | 2026-04 | |||||||||||||||||
| Lease expiration period, month and year | 2014-01 | 2020-10 | 2014-01 | 2014-04 | 2014-04 | 2024-07 | 2023-05 | |||||||||||||||
| Annualized straight line rent escalations | 300,000 | 1,000,000 | 300,000 | 400,000 | 700,000 | 200,000 | ||||||||||||||||
| Tenant allowance | 500,000 | 3,400 | 50,000 | 80,000 | ||||||||||||||||||
| Expansion of our property, value | 3,300,000 | |||||||||||||||||||||
| Expansion of our property, area | 102,400 | 150,000 | ||||||||||||||||||||
| 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 | |||||||||||||||||||||
| Remaining lease term after expansion | 20 years | |||||||||||||||||||||
| Percentage used for calculation of lease rental | 9.25% | |||||||||||||||||||||
| Annual increase in lease rental | 2.00% | |||||||||||||||||||||
| Total annual property taxes for all properties not paid by tenants | $ 10,800,000 | |||||||||||||||||||||