Summary of Acquisitions of Real Estate Held for Investment (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2016 USD ($)
Multi Tenant Retail
Transaction to Real Estate Investments [Line Items]
Original Purchase Price	$ 132,000
OHIO | Single Tenant Properties
Transaction to Real Estate Investments [Line Items]
Date of Acquisition	Jul. 31, 2015
Original Purchase Price	$ 11,000
Remaining Lease Term (Years)	4 years 1 month 6 days	[1]
FLORIDA | Multi Tenant Retail
Transaction to Real Estate Investments [Line Items]
Date of Acquisition	Aug. 31, 2015
Original Purchase Price	$ 18,900
Remaining Lease Term (Years)	4 years 9 months 18 days	[1]
DISTRICT OF COLUMBIA | Multifamily Property
Transaction to Real Estate Investments [Line Items]
Date of Acquisition	Oct. 31, 2015
Original Purchase Price	$ 75,000
Remaining Lease Term (Years)	1 year	[1]
CALIFORNIA | Multi Tenant Retail
Transaction to Real Estate Investments [Line Items]
Date of Acquisition	Oct. 31, 2015
Original Purchase Price	$ 37,750
Remaining Lease Term (Years)	3 years 9 months 18 days	[1]
TEXAS
Transaction to Real Estate Investments [Line Items]
Original Purchase Price	$ 131,950
TEXAS | Multi Tenant Retail
Transaction to Real Estate Investments [Line Items]
Date of Acquisition	Nov. 30, 2015
Original Purchase Price	$ 131,950
Remaining Lease Term (Years)	4 years 4 months 24 days	[1]

[1] Does not include extension options.