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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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