Quarterly report pursuant to Section 13 or 15(d)

Real Estate and Intangible Assets - Summary of Lease on Property (Parenthetical) (Detail)

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Real Estate and Intangible Assets - Summary of Lease on Property (Parenthetical) (Detail)
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Bolingbrook, IL [Member]    
Real Estate Properties [Line Items]    
Percentage of building lease space occupied 24.90%  
Percentage of building occupied by tenant 62.70%  
Raleigh, NC One [Member]    
Real Estate Properties [Line Items]    
Percentage of building lease space occupied   18.30%
Percentage of building occupied by tenant   93.20%