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Related Party Transactions and Arrangements - Additional Information (Detail)		1 Months Ended	3 Months Ended	12 Months Ended
	Oct. 05, 2016 shares	Jun. 30, 2017 USD ($) Property	Jun. 30, 2016 USD ($) Property	Dec. 31, 2017 USD ($) Property shares	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Related Party Transaction [Line Items]
Dividends paid, common stock				$ 53,246,000	$ 37,880,000	$ 26,014,000
Number of property dispositions | Property				4
Total interest expense paid				$ 27,368,000	33,034,000	22,105,000
Number of property acquired | Property				2,340
Acquisition of real estate properties				$ 220,254,000		24,746,000
Common Shares
Related Party Transaction [Line Items]
Common stock repurchased and retired shares | shares				59,631
R A I T Financial Trust
Related Party Transaction [Line Items]
Asset management fees earned				$ 257,000
Dividends paid, common stock				0	3,926,000	5,234,000
Repayment of term loan facility			$ 38,075,000
Number of property dispositions | Property			2
R A I T Financial Trust | Common Shares
Related Party Transaction [Line Items]
Common stock repurchased and retired shares | shares	7,269,719
Former Advisor
Related Party Transaction [Line Items]
Asset management fees earned				0	7,092,000	4,984,000
Incentive fee earned by the former advisor				0	350,000	629,000
Former Advisor | Shares Services Agreement
Related Party Transaction [Line Items]
Cost incurred for service provided				$ 727,000	0	0
Term of agreement				December 21, 2016 to June 20, 2017
Property Manager
Related Party Transaction [Line Items]
Property management and leasing fees				$ 0	4,769,000	3,675,000
Sponsor | R A I T Financial Trust
Related Party Transaction [Line Items]
Total interest expense paid				$ 0	$ 361,000	$ 965,000
R A I T Financial Trust | North Carolina
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

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