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Real Estate and Intangible Assets - Additional Information (Detail) (USD $)
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3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 1 Months Ended | 6 Months Ended | 1 Months Ended | |||||||
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Jun. 30, 2013
Property
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Jun. 30, 2012
Property
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Jun. 30, 2013
Property
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Jun. 30, 2012
Property
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Dec. 31, 2012
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Jun. 30, 2013
One Properties Acquired [Member]
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Jun. 30, 2013
One Properties Acquired [Member]
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Nov. 30, 2005
Clintonville, WI [Member]
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Jun. 30, 2013
Clintonville, WI [Member]
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Apr. 30, 2013
Clintonville, WI [Member]
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Jan. 31, 2013
Champaign, Illinois [Member]
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Apr. 30, 2013
OHIO [Member]
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Apr. 30, 2013
WISCONSIN [Member]
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Apr. 11, 2013
WISCONSIN [Member]
sqft
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| Operating Leased Assets [Line Items] | ||||||||||||||
| Total Purchase Price | $ 36,738,000 | $ 42,565,000 | $ 5,300,000 | $ 3,250,000 | ||||||||||
| Total investment in property | 564,952,000 | 564,952,000 | 533,753,000 | 8,600,000 | ||||||||||
| Number of properties acquired | 3 | 5 | 3 | 5 | ||||||||||
| Acquisition-related costs excluded in pro-forma earnings | 274,000 | 528,000 | 459,000 | 688,000 | 300,000 | 400,000 | ||||||||
| Total annual property taxes for all properties not paid by tenants | 9,400,000 | |||||||||||||
| 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 | 394,000 | 1,101,000 | 400,000 | |||||||||||
| Lease expiration date, extended | Jan. 31, 2024 | Oct. 31, 2028 | ||||||||||||
| Lease expiration date | Jan. 31, 2014 | Oct. 31, 2020 | ||||||||||||
| Extended additional period of lease | 10 years | 8 years | ||||||||||||
| Annualized straight line rent escalations | 300,000 | 1,000,000 | ||||||||||||
| Tenant allowance | 500,000 | |||||||||||||
| Expansion of our property, value | 3,300,000 | |||||||||||||
| Expansion of our property, area | 102,400 | |||||||||||||
| Rental income revised | $ 600,000 | |||||||||||||