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Acquisitions - Schedule of Acquisition Cost of Shopping Centers (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |
Less: Below-market leases | $ (127,513) | $ (147,941)
Shopping Center Acquired [Member] |  |
Business Acquisition [Line Items] |  |
Land | 23,588 | 27,093
Buildings | 35,659 | 99,034
Tenant improvements | 8,565 | 4,385
Other assets | 419 | 146
Assets acquired | 82,216 | 153,489
Less: Below-market leases | (1,872) | (6,967)
Less: Other liabilities assumed | (581) | (547)
Net assets acquired | 79,763 | 145,975
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 | $ 7,051 | $ 14,021
Weighted Average Amortization Period | 16 years | 5 years 1 month 6 days
Shopping Center Acquired [Member] | Tenant Relationships [Member] |  |
Business Acquisition [Line Items] |  |
Intangible assets acquired | $ 6,934 | $ 8,810
Weighted Average Amortization Period | 16 years 3 months 19 days | 11 years 1 month 6 days
Shopping Center Acquired [Member] | Below-Market Leases [Member] |  |
Business Acquisition [Line Items] |  |
Weighted Average Amortization Period | 20 years | 15 years 4 months 24 days

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