Quarterly report pursuant to Section 13 or 15(d)

Real Estate and Intangible Assets - Fair Value of Acquired Assets and Liabilities Assumed Related to Properties Acquired (Parenthetical) (Detail)

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Real Estate and Intangible Assets - Fair Value of Acquired Assets and Liabilities Assumed Related to Properties Acquired (Parenthetical) (Detail) (USD $)
9 Months Ended
Sep. 30, 2014
2014 New Real Estate Activity [Member]
Sep. 30, 2013
2013 New Real Estate Activity [Member]
Business Acquisition Purchase Price Allocation [Line Items]    
Acquisition costs were direct costs incurred related to leases $ 17,558 $ 13,377