Lease Intangible Assets and Liabilities - Summary of Lease Intangible Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross Asset	$ 563,346	$ 613,601
Accumulated Amortization	(253,248)	(149,202)
Balance	310,098	464,399
In-Place Leases, Net [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Asset	542,655	592,871
Accumulated Amortization	(249,569)	(146,964)
Balance	293,086	445,907
Below-Market Ground Leases, Net [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Asset	11,766	11,766
Accumulated Amortization	(508)	(305)
Balance	11,258	11,461
Above-Market Leases, Net [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Asset	8,925	8,964
Accumulated Amortization	(3,171)	(1,933)
Balance	$ 5,754	$ 7,031