Annual report pursuant to Section 13 and 15(d)

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

v3.6.0.2
Real Estate and Intangible Assets - Summary of Properties Acquired (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
USD ($)
ft²
Dec. 31, 2015
USD ($)
ft²
lease
tenant
Jul. 25, 2014
ft²
Business Acquisition [Line Items]      
Aggregate Square Footage | ft²     81,371
Aggregate Purchase Price $ 66,570 $ 77,798  
Series of Property Acquisitions [Member]      
Business Acquisition [Line Items]      
Aggregate Square Footage | ft² 329,620 520,053  
Aggregate Purchase Price $ 66,570 $ 77,798  
Acquisition Expenses 179 586  
Aggregate Annualized GAAP Rent 5,589 7,984  
Aggregate Debt Issued $ 38,800 $ 43,379  
Salt Lake City, UT [Member]      
Business Acquisition [Line Items]      
Aggregate Square Footage | ft² 107,062 86,409  
Lease Term 6 years 6 years 6 months  
Aggregate Purchase Price $ 17,000 $ 22,200  
Aggregate Annualized GAAP Rent 1,400 2,400  
Aggregate Debt Issued $ 9,900 $ 13,000  
Fort Lauderdale, FL [Member]      
Business Acquisition [Line Items]      
Aggregate Square Footage | ft² 119,224    
Lease Term 9 years    
Aggregate Purchase Price $ 23,900    
Aggregate Debt Issued $ 14,100    
King of Prussia, PA [Member]      
Business Acquisition [Line Items]      
Aggregate Square Footage | ft² 103,334    
Lease Term 15 years    
Aggregate Purchase Price $ 25,700    
Acquisition Expenses 200    
Aggregate Annualized GAAP Rent 2,200    
Aggregate Debt Issued $ 14,800    
Richardson, TX [Member]      
Business Acquisition [Line Items]      
Aggregate Square Footage | ft²   155,984  
Lease Term   9 years 6 months  
Aggregate Purchase Price   $ 24,700  
Aggregate Annualized GAAP Rent   2,700  
Aggregate Debt Issued   $ 14,600  
Birmingham, AL [Member]      
Business Acquisition [Line Items]      
Aggregate Square Footage | ft²   30,850  
Lease Term   8 years 6 months  
Aggregate Purchase Price   $ 3,600  
Aggregate Annualized GAAP Rent   $ 300  
Columbus, OH [Member]      
Business Acquisition [Line Items]      
Aggregate Square Footage | ft²   78,033  
Lease Term   15 years  
Aggregate Purchase Price   $ 7,700  
Aggregate Annualized GAAP Rent   600  
Aggregate Debt Issued   $ 4,500  
Atlanta, GA [Member]      
Business Acquisition [Line Items]      
Aggregate Square Footage | ft²   78,151  
Lease Term   7 years  
Aggregate Purchase Price   $ 13,000  
Aggregate Annualized GAAP Rent   1,300  
Aggregate Debt Issued   $ 7,500  
Number of tenants | tenant   1  
Number of leases | lease   2  
Atlanta, GA [Member] | Fifteen Year Lease [Member]      
Business Acquisition [Line Items]      
Lease Term   15 years  
Percentage of building occupied by tenant (as percent)   30.00%  
Villa Rica, GA [Member]      
Business Acquisition [Line Items]      
Aggregate Square Footage | ft²   90,626  
Lease Term   18 years  
Aggregate Purchase Price   $ 6,600  
Aggregate Annualized GAAP Rent   600  
Aggregate Debt Issued   $ 3,800  
Weighted Average [Member]      
Business Acquisition [Line Items]      
Lease Term 3 years 10 months 24 days 7 years 3 months 18 days  
Weighted Average [Member] | Series of Property Acquisitions [Member]      
Business Acquisition [Line Items]      
Lease Term 10 years 6 months 9 years 10 months 24 days