Annual report pursuant to Section 13 and 15(d)

Real Estate and Intangible Assets - Additional Information (Detail)

v3.6.0.2
Real Estate and Intangible Assets - Additional Information (Detail)
$ in Thousands
12 Months Ended
May 31, 2016
property
Dec. 31, 2016
USD ($)
property
Dec. 31, 2015
USD ($)
property
Dec. 31, 2014
USD ($)
Real Estate Properties [Line Items]        
Number of properties acquired | property   3 6  
Number of leased properties | property   9 15  
Tenant reimbursements   $ 1,489 $ 1,753 $ 2,079
Total amortization expense related to lease intangible assets   13,400 13,100 10,100
Amortization related to below-market lease   1,200 900 700
Above Market Leases [Member]        
Real Estate Properties [Line Items]        
Amortization related to above-market lease   500 $ 400 $ 300
Newburyport, Massachusetts [Member]        
Real Estate Properties [Line Items]        
Number of leased properties | property 1      
Tenant reimbursements   900    
Newburyport, Massachusetts [Member] | Other Income [Member]        
Real Estate Properties [Line Items]        
Tenant reimbursements   $ 300