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Lease Intangible Assets and Liabilities - Schedule of Estimated Annual Amortization of Acquired In Place Leases (Detail) - In-Place Leases, Net [Member]
$ in Thousands
Dec. 31, 2017
USD ($)
Acquired Finite-Lived Intangible Assets [Line Items]  
2018 $ 61,997
2019 37,357
2020 36,911
2021 36,127
2022 $ 35,151