Quarterly report pursuant to Section 13 or 15(d)

Real Estate and Intangible Assets - Additional Information (Detail)

v3.5.0.2
Real Estate and Intangible Assets - Additional Information (Detail)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
property
Jun. 30, 2015
USD ($)
lease
property
Jun. 30, 2016
USD ($)
property
Jun. 30, 2015
USD ($)
lease
property
Real Estate Properties [Line Items]        
Number of properties acquired | property   4   4
Number of leased properties | property 3      
Tenant recovery revenue $ 357 $ 394 $ 842 $ 718
Number of leases amended | lease   6   6
Total amortization expense related to lease intangible assets 3,300 $ 3,500 6,600 $ 6,400
Amortization related to below-market lease 200 200 500 500
Building and Tenant Improvements [Member]        
Real Estate Properties [Line Items]        
Real estate depreciation expense 5,900 5,500 11,800 10,700
Above Market Leases [Member]        
Real Estate Properties [Line Items]        
Amortization related to above-market lease $ 100 $ 100 $ 200 $ 200
2015 Real Estate Activity [Member]        
Real Estate Properties [Line Items]        
Number of properties acquired | property   4   4
Salt Lake City UT [Member]        
Real Estate Properties [Line Items]        
Number of properties acquired | property 1   1  
Other Income [Member]        
Real Estate Properties [Line Items]        
Tenant recovery revenue $ 300      
Newburyport, Massachusetts [Member]        
Real Estate Properties [Line Items]        
Tenant recovery revenue $ 900   $ 900  
Newburyport, Massachusetts [Member] | Other Income [Member]        
Real Estate Properties [Line Items]        
Tenant recovery revenue     $ 300