Intangible Assets - Summary of Acquired Lease Intangible Assets and Liabilities (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Acquired Finite Lived Intangible Assets [Line Items]
Acquired lease intangible assets, net	$ 41,087	$ 36,365
Acquired lease intangible liabilities, net	(10,785)	(9,130)
In-place lease intangibles
Acquired Finite Lived Intangible Assets [Line Items]
Acquired lease intangible assets, gross	78,873	68,234
Accumulated amortization	(43,633)	(37,648)
Acquired lease intangible assets, net	35,240	30,586
Above Market Tenant Leases
Acquired Finite Lived Intangible Assets [Line Items]
Acquired lease intangible assets, gross	10,901	10,191
Accumulated amortization	(5,054)	(4,412)
Acquired lease intangible assets, net	5,847	5,779
Below Market Tenant Leases
Acquired Finite Lived Intangible Assets [Line Items]
Acquired lease intangible liabilities, gross	(15,112)	(12,426)
Accumulated accretion	4,492	3,477
Acquired lease intangible liabilities, net	(10,620)	(8,949)
Above-market ground lease
Acquired Finite Lived Intangible Assets [Line Items]
Acquired lease intangible liabilities, gross	(290)	(290)
Accumulated accretion	125	109
Acquired lease intangible liabilities, net	$ (165)	$ (181)