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Related Party Transactions and Arrangements - Additional Information (Detail)		1 Months Ended	3 Months Ended			9 Months Ended
	Oct. 05, 2016 shares	Jun. 30, 2017 USD ($) Property	Sep. 30, 2017 USD ($) Property	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($) Property	Sep. 30, 2017 USD ($) Property shares	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Related Party Transaction [Line Items]
Dividends paid, common stock						$ 38,151,000
Number of property dispositions | Property			3			3
Number of property acquired | Property			1,621			1,621
Acquisition of real estate properties						$ 169,156,000
Common Shares
Related Party Transaction [Line Items]
Common stock repurchased and retired shares | shares						60,377
R A I T Financial Trust
Related Party Transaction [Line Items]
Dividends paid, common stock			$ 0	$ 1,309,000		$ 0	$ 3,926,000
Repayment of term loan facility					$ 38,075,000
Number of property dispositions | Property					2
Former Advisor
Related Party Transaction [Line Items]
Asset management fees earned			0	1,727,000		0	5,141,000
Incentive fee earned by the former advisor			0	206,000		0	350,000
Former Advisor | Shares Services Agreement
Related Party Transaction [Line Items]
Cost incurred for service provided						$ 727,000	0
Term of agreement						December 21, 2016 to June 20, 2017
Former Advisor | Incentive Fees
Related Party Transaction [Line Items]
Former advisor and management fees payable			0			$ 0		$ 0
Property Manager
Related Party Transaction [Line Items]
Former advisor and management fees payable			0			0		$ 0
Property management and leasing fees			0	1,219,000		0	3,710,000
R A I T Financial Trust | Durham, NC
Related Party Transaction [Line Items]
Number of property acquired | Property		328
Acquisition of real estate properties		$ 42,950,000
R A I T Financial Trust | Common Shares
Related Party Transaction [Line Items]
Common stock repurchased and retired shares | shares	7,269,719
Sponsor | R A I T Financial Trust
Related Party Transaction [Line Items]
Total interest expense paid			$ 0	$ 0		$ 486,000	$ 486,000

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