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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, 2016 | Dec. 31, 2015
Business Acquisition [Line Items] |  |
Less: Below-market leases | $ (147,941) | $ (155,297)
Shopping Center Acquired [Member] |  |
Business Acquisition [Line Items] |  |
Land | 27,093 | 74,699
Buildings | 99,034 | 140,668
Tenant improvements | 4,385 | 5,229
Other assets | 146 | 1,252
Assets acquired | 153,489 | 250,274
Less: Mortgage debt assumed at fair value | 0 | (33,735)
Less: Below-market leases | (6,967) | (29,885)
Less: Other liabilities assumed | (547) | (1,169)
Net assets acquired | 145,975 | 185,485
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 | $ 14,021 | $ 19,250
Weighted Average Amortization Period | 5 years 1 month 6 days | 7 years 3 months 18 days
Shopping Center Acquired [Member] | Tenant Relations [Member] |  |
Business Acquisition [Line Items] |  |
Intangible assets acquired | $ 8,810 | $ 9,176
Weighted Average Amortization Period | 11 years 1 month 6 days | 10 years 10 months 24 days
Shopping Center Acquired [Member] | Below-Market Leases [Member] |  |
Business Acquisition [Line Items] |  |
Weighted Average Amortization Period | 15 years 4 months 24 days | 18 years 4 months 24 days

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