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Acquisitions - Schedule of Acquisition Cost of Shopping Centers (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]    
Less: Below-market leases $ (50,332) $ (127,513)
Shopping Center Acquired [Member]    
Business Acquisition [Line Items]    
Land 9,340 23,588
Buildings 20,661 35,659
Tenant improvements 370 8,565
Other assets 13 419
Assets acquired 36,546 82,216
Less: Below-market leases (1,333) (1,872)
Less: Other liabilities assumed (144) (581)
Net assets acquired 35,069 79,763
Shopping Center Acquired [Member] | In-Place Leases (Including Lease Origination Costs and Fair Market Value of Leases) [Member]    
Business Acquisition [Line Items]    
Intangible assets acquired $ 4,517 $ 7,051
Weighted Average Amortization Period 3 years 8 months 12 days 16 years
Shopping Center Acquired [Member] | Tenant Relationships [Member]    
Business Acquisition [Line Items]    
Intangible assets acquired $ 1,645 $ 6,934
Weighted Average Amortization Period 5 years 3 months 18 days 16 years 3 months 19 days
Shopping Center Acquired [Member] | Below-Market Leases [Member]    
Business Acquisition [Line Items]    
Weighted Average Amortization Period 12 years 8 months 12 days 20 years