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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, 2018 USD ($) Property shares	Dec. 31, 2017 USD ($) Property shares	Dec. 31, 2016 USD ($)
Related Party Transaction [Line Items]
Asset management fees earned				$ 6,963,000	$ 6,006,000	$ 4,847,000
Dividends paid, common stock				$ 63,409,000	$ 53,246,000	37,880,000
Number of property acquired | Property				2,379	2,340
Acquisition of real estate properties				$ 215,833,000	$ 221,813,000	1,000,000
Common Shares
Related Party Transaction [Line Items]
Common stock repurchased and retired shares | shares				38,712,000	59,631,000
R A I T Financial Trust
Related Party Transaction [Line Items]
Dividends paid, common stock				$ 0	$ 0	3,926,000
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
Management Expenses | R A I T Financial Trust
Related Party Transaction [Line Items]
Asset management fees earned				63,000	257,000	0
Former Advisor
Related Party Transaction [Line Items]
Incentive fee earned by the former advisor				0	0	350,000
Former Advisor | Shares Services Agreement
Related Party Transaction [Line Items]
Cost incurred for service provided				$ 0	727,000	0
Term of agreement				December 21, 2016 to June 20, 2017
Former Advisor | Management Expenses
Related Party Transaction [Line Items]
Asset management fees earned				$ 0	0	7,092,000
Property Manager
Related Party Transaction [Line Items]
Property management and leasing fees				0	0	4,769,000
Sponsor | R A I T Financial Trust
Related Party Transaction [Line Items]
Total interest expense paid				$ 0	$ 0	$ 361,000
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

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