Intangible Assets - Summary of Acquired Lease Intangible Assets and Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Acquired Finite Lived Intangible Assets [Line Items]
Acquired lease intangible assets, net	$ 67,304	$ 73,090
Acquired lease intangible liabilities, net	(61,148)	(59,340)
In-place lease intangibles
Acquired Finite Lived Intangible Assets [Line Items]
Acquired lease intangible assets, gross	165,570	154,370
Accumulated amortization	(104,166)	(87,955)
Acquired lease intangible assets, net	61,404	66,415
Above-market tenant leases
Acquired Finite Lived Intangible Assets [Line Items]
Acquired lease intangible assets, gross	14,375	14,296
Accumulated amortization	(8,475)	(7,621)
Acquired lease intangible assets, net	5,900	6,675
Below-market tenant leases
Acquired Finite Lived Intangible Assets [Line Items]
Acquired lease intangible liabilities, gross	(92,228)	(81,718)
Accumulated accretion	31,080	22,378
Acquired lease intangible liabilities, net	$ (61,148)	$ (59,340)