Summary of Acquisitions of Real Estate Held for Investment (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($)
Transaction to Real Estate Investments [Line Items]
Type	$ 610
OHIO | Single Tenant Properties [Member]
Transaction to Real Estate Investments [Line Items]
Date of Acquisition	Jul. 31, 2015
Type	$ 0
Purchase Price	$ 11,000
Remaining Lease Term (Years)	4 years 7 months 6 days
FLORIDA | Multi Tenant Properties
Transaction to Real Estate Investments [Line Items]
Date of Acquisition	Aug. 31, 2015
Type	$ 0
Purchase Price	$ 18,900
Remaining Lease Term (Years)	5 years 1 month 6 days
DISTRICT OF COLUMBIA | Multi Family Real Estate Properties
Transaction to Real Estate Investments [Line Items]
Date of Acquisition	Oct. 31, 2015
Type	$ 0
Purchase Price	$ 75,000
Remaining Lease Term (Years)	3 months 18 days
CALIFORNIA | Multi Tenant Properties
Transaction to Real Estate Investments [Line Items]
Date of Acquisition	Oct. 31, 2015
Type	$ 0
Purchase Price	$ 37,750
Remaining Lease Term (Years)	3 years
TEXAS | Multi Tenant Properties
Transaction to Real Estate Investments [Line Items]
Date of Acquisition	Nov. 30, 2015
Type	$ 0
Purchase Price	$ 131,950
Remaining Lease Term (Years)	4 years 3 months 18 days