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Real Estate and Intangible Assets - Additional Information (Detail) (USD $)
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0 Months Ended | 9 Months Ended | 0 Months Ended | 9 Months Ended | 0 Months Ended | 9 Months Ended | 9 Months Ended | ||||||
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Jul. 07, 2014
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Jun. 11, 2014
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Sep. 30, 2014
Property
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Sep. 30, 2013
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Sep. 30, 2014
Concord Township, Ohio [Member]
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Sep. 30, 2014
Newburyport, Massachusetts [Member]
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Jun. 11, 2014
Burnsville, MN [Member]
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Sep. 30, 2014
Burnsville, MN [Member]
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May 06, 2014
Austin, Texas [Member]
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Sep. 30, 2014
Austin, Texas [Member]
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Sep. 30, 2014
San Antonio, Texas [Member]
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Sep. 30, 2014
2014 Real Estate Activity [Member]
Property
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Sep. 30, 2013
2013 Real Estate Activity [Member]
Property
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| Real Estate Properties [Line Items] | |||||||||||||
| Number of properties acquired | 8 | 8 | 5 | ||||||||||
| Number of properties expanded | 1 | ||||||||||||
| Lease expiration date | Apr. 30, 2015 | ||||||||||||
| Option to extend lease term | 8 years | ||||||||||||
| Original lease expiration | 2015-03 | 2015-06 | |||||||||||
| Extended lease expiration | 2020-03 | 2022-06 | |||||||||||
| Amount of annualized straight line rents over the life of the lease | $ 700,000 | ||||||||||||
| Leasing commissions paid | 200,000 | 898,000 | 1,008,000 | 500,000 | 200,000 | ||||||||
| Tenant improvements payable | 3,300,000 | 1,300,000 | |||||||||||
| Extended additional period of lease | 3 years | 8 years | |||||||||||
| Extended lease expiration date | 2023-01 | ||||||||||||
| Lease expiration period, month and year | 2016-11 | 2021-08 | 2015-06 | ||||||||||
| Annualized straight line rent escalations | 1,000,000 | ||||||||||||
| Annual increase in lease rental | 14.00% | ||||||||||||
| Annualized straight line rent escalations | 600,000 | ||||||||||||
| Amount paid for tenant improvements | $ 900,000 | ||||||||||||
| Modified lease payment description | The lease covering this property was adjusted to defer a portion of rental payments covering the period August 2014 through December 2014. The tenant will repay the deferred rent balance monthly during calendar year 2015. | The leases covering these respective properties were adjusted to defer rental payments covering the period September 1, 2014 through November 30, 2014. | The leases covering these respective properties were adjusted to defer rental payments covering the period September 1, 2014 through November 30, 2014. | ||||||||||