Quarterly report pursuant to Section 13 or 15(d)

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

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Real Estate and Intangible Assets - Summary of Lease on Property Additional Information (Detail)
 6 Months Ended
Jun. 30, 2016
Jun. 30, 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%  
Maple Heights, OH [Member]    
Real Estate Properties [Line Items]    
Percentage of building lease space occupied 11.70%  
Percentage of building occupied by tenant 92.80%  
Burnsville, MN [Member]    
Real Estate Properties [Line Items]    
Percentage of building lease space occupied 11.00%  
Percentage of building occupied by tenant 80.40%  
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%  
Columbus, OH [Member]    
Real Estate Properties [Line Items]    
Percentage of building occupied by tenant 92.00%  
Raleigh NC Two [Member]    
Real Estate Properties [Line Items]    
Percentage of building lease space occupied   74.80%
Percentage of building occupied by tenant 93.20%