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Subsequent Events - Additional Information (Detail) (USD $)
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6 Months Ended | 6 Months Ended | 1 Months Ended | 6 Months Ended | 1 Months Ended | 6 Months Ended | 1 Months Ended | 6 Months Ended | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Jun. 30, 2013
sqft
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Jun. 30, 2012
sqft
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Dec. 31, 2012
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Jun. 30, 2013
Senior Common Stock [Member]
Maximum [Member]
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Jul. 17, 2013
Subsequent Event [Member]
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Jul. 31, 2013
Subsequent Event [Member]
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Jun. 30, 2013
Subsequent Event [Member]
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Jul. 09, 2013
Subsequent Event [Member]
Austin Texas [Member]
sqft
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Jun. 30, 2013
Subsequent Event [Member]
Austin Texas [Member]
Option
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Jul. 10, 2013
Subsequent Event [Member]
Allen Texas [Member]
sqft
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Jun. 30, 2013
Subsequent Event [Member]
Allen Texas [Member]
Tenants
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Jun. 30, 2013
Subsequent Event [Member]
Allen Texas [Member]
Tenant One [Member]
Option
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Jun. 30, 2013
Subsequent Event [Member]
Allen Texas [Member]
Tenant Two [Member]
Option
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Jul. 03, 2013
Subsequent Event [Member]
Long Term Notes [Member]
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Jun. 30, 2013
Subsequent Event [Member]
Long Term Notes [Member]
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| Subsequent Event [Line Items] | |||||||||||||||
| Borrowed from wholly-owned subsidiaries | $ 370,440,000 | $ 384,185,000 | $ 8,200,000 | ||||||||||||
| Accrues interest at a fixed rate | 5.00% | ||||||||||||||
| Accrues interest maturity date | Aug. 01, 2023 | ||||||||||||||
| Acquisition of our property, area | 393,932 | 557,283 | 320,000 | 115,200 | |||||||||||
| Acquisition of our property, value | 36,738,000 | 42,565,000 | 57,000,000 | 15,200,000 | |||||||||||
| Acquisition Expenses | 417,000 | 522,000 | 200,000 | 100,000 | |||||||||||
| Mortgage repayment | 3,560,000 | 4,317,000 | 35,300,000 | 35,300,000 | |||||||||||
| Lease term | 7 years | 9 years | 8 years | ||||||||||||
| Renew lease options | 3 | 2 | 2 | ||||||||||||
| Renew the lease for additional periods | 3 years | 5 years | 5 years | ||||||||||||
| Annualized straight line rent escalations | 200,000 | 4,700,000 | 1,400,000 | ||||||||||||
| Redemption of aggregate principal amount | 5.00% | ||||||||||||||
| Number of tenants in this property | 2 | ||||||||||||||
| Percentage of occupies space | 73.00% | ||||||||||||||
| Common Shares issued | 158,000 | ||||||||||||||
| Public offering price | $ 18.82 | ||||||||||||||
| Gross proceeds from common shares issued | 3,000,000 | ||||||||||||||
| Amount used to acquire real estate | 2,800,000 | ||||||||||||||
| Lease commencement date | Aug 1, 2013 | ||||||||||||||
| Lease expiry date | May 31, 2023 | ||||||||||||||
| Lease commission to be paid | 394,000 | 1,101,000 | 100,000 | ||||||||||||
| Amount to be paid for tenant improvements | $ 300,000 | ||||||||||||||