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INCOME PROPERTIES - Acquisitions (Detail)
$ in Millions
6 Months Ended
Jun. 30, 2018
USD ($)
property
Jun. 30, 2017
USD ($)
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 | $   $ 40.0
Aggregate acquisition cost including capitalized acquisition costs | $ $ 29.0 $ 40.7
Weighted average amortization period of intangible assets 20 years 9 years 9 months 18 days
Weighted average amortization period of intangible liabilities 20 years 9 years 9 months 18 days
Real Estate Operations | Nonrecurring basis    
Acquisitions    
Land | $ $ 12.0 $ 18.0
Buildings and improvements | $ $ 15.0 19.3
Intangible assets pertaining to the in-place lease value, leasing fees and above market lease value | $   4.9
Intangible liabilities for below market lease value | $   $ 1.5
Single-tenant    
Acquisitions    
Number of real estate properties | property 1 3
Multi-tenant    
Acquisitions    
Number of real estate properties | property   2
2018 acquisitions of income property subject to a lease | Sold    
Acquisitions    
Number of properties in the disposal group | property   0