Lease Intangible Assets and Liabilities - Summary of Lease Intangible Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Asset	$ 260,324	$ 287,001
Accumulated Amortization	(163,992)	(163,345)
Balance	96,332	123,656
In-Place Leases, Net [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Asset	253,198	266,897
Accumulated Amortization	(160,355)	(158,235)
Balance	92,843	108,662
Above-Market Leases, Net [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Asset	7,126	8,338
Accumulated Amortization	(3,637)	(4,400)
Balance	$ 3,489	3,938
Below-Market Ground Leases, Net [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Asset		11,766
Accumulated Amortization		(710)
Balance		$ 11,056