Quarterly report pursuant to Section 13 or 15(d)

Real Estate and Intangible Assets - Summary of Properties Acquired (Parenthetical) (Detail)

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Real Estate and Intangible Assets - Summary of Properties Acquired (Parenthetical) (Detail)
9 Months Ended
Sep. 30, 2015
Lease
Tenants
Sep. 30, 2014
Business Acquisition [Line Items]    
Lease expiration year   2016-11
Lease renewal terms description   The other tenants in the building have varying lease expirations from December 2015 to October 2018. No other tenants have renewal options.
Atlanta, GA [Member]    
Business Acquisition [Line Items]    
Number of tenant | Tenants 1  
Number of leases 2  
Percentage of building occupied by tenant 100.00%  
Lease Two [Member] | Atlanta, GA [Member]    
Business Acquisition [Line Items]    
Percentage of building occupied by tenant 30.00%  
Lease expiration period 15 years  
Lease One [Member] | Atlanta, GA [Member]    
Business Acquisition [Line Items]    
Percentage of building occupied by tenant 70.00%  
Lease expiration period 7 years