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INCOME PROPERTIES - Acquisitions (Detail)
$ in Thousands
3 Months Ended
Mar. 31, 2018
USD ($)
property
Mar. 31, 2017
USD ($)
property
Acquisitions    
Number of properties in the disposal group | property 4  
Single-tenant    
Acquisitions    
Number of real estate properties | property 29  
Multi-tenant    
Acquisitions    
Number of real estate properties | property 7  
Real Estate Operations    
Acquisitions    
Purchase price   $ 19,100
Aggregate acquisition cost including capitalized acquisition costs $ 29,000 $ 19,400
Weighted average amortization period of intangible assets 20 years 3 years 10 months 24 days
Weighted average amortization period of intangible liabilities 20 years 3 years 10 months 24 days
Real Estate Operations | Nonrecurring basis    
Acquisitions    
Land $ 12,000 $ 13,300
Buildings and improvements $ 15,000 4,800
Intangible assets pertaining to the in-place lease value, leasing fees and above market lease value   2,100
Intangible liabilities for below market lease value   $ 800
Single-tenant    
Acquisitions    
Number of real estate properties | property 1 1
Multi-tenant    
Acquisitions    
Number of real estate properties | property   1