Intangible Assets - Summary of Amortization or Accretion Recorded During the Period Related to Acquired Lease Intangibles (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Acquired Finite Lived Intangible Assets [Line Items]
Amortization of (below) above market lease intangibles, net			$ (1,203)	$ 17
In-place lease intangibles
Acquired Finite Lived Intangible Assets [Line Items]
Amortization of in-place lease intangibles	$ 4,708	$ 3,561	10,812	9,849
Net above (below) market tenant leases
Acquired Finite Lived Intangible Assets [Line Items]
Amortization of (below) above market lease intangibles, net	(877)	(31)	(1,179)	41
Above-market ground lease
Acquired Finite Lived Intangible Assets [Line Items]
Accretion of above-market ground lease intangibles	$ (8)	$ (8)	$ (24)	$ (24)