Summary of Acquisitions of Real Estate Held for Investment (Detail) - USD ($) $ in Thousands		3 Months Ended	6 Months Ended
		Jun. 30, 2016	Jun. 30, 2016
Multi Tenant Retail
Transaction to Real Estate Investments [Line Items]
Original Purchase Price		$ 132,000
OHIO | Single Tenant Properties [Member]
Transaction to Real Estate Investments [Line Items]
Date of Acquisition			Jul. 31, 2015
Original Purchase Price			$ 11,000
Remaining Lease Term (Years)	[1]		4 years 4 months 24 days
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)	[1]		4 years 10 months 24 days
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]		1 month 6 days
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)	[1]		2 years 9 months 18 days
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)	[1]		4 years 7 months 6 days

[1] Does not include extension options.