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Acquisitions - Schedule of Acquisition Cost of Shopping Centers (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Business Acquisition [Line Items] |  |
Less: Below-market leases | $ (155,300) | $ (139,300)
Shopping Center Acquired [Member] |  |
Business Acquisition [Line Items] |  |
Land | 74,699 | 147,559
Buildings | 140,668 | 399,274
Tenant improvements | 5,229 | 9,625
Construction in progress | 0 | 76,214
Other assets | 1,252 | 4,402
Assets acquired | 250,274 | 732,586
Less: Mortgage debt assumed at fair value | (33,735) | (293,288)
Less: Below-market leases | (29,885) | (28,115)
Less: Other liabilities assumed | (1,169) | (3,478)
Net assets acquired | 185,485 | 407,705
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 | $ 19,250 | $ 59,684
Weighted Average Amortization Period | 7 years 3 months 18 days | 7 years 1 month 6 days
Shopping Center Acquired [Member] | Tenant Relations [Member] |  |
Business Acquisition [Line Items] |  |
Intangible assets acquired | $ 9,176 | $ 35,828
Weighted Average Amortization Period | 10 years 10 months 24 days | 7 years 8 months 12 days
Shopping Center Acquired [Member] | Below-Market Leases [Member] |  |
Business Acquisition [Line Items] |  |
Weighted Average Amortization Period | 18 years 4 months 24 days | 19 years 1 month 6 days

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