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Related Party Transactions and Arrangements - Additional Information (Detail) - USD ($) |  | 3 Months Ended |
--- | --- | --- | ---
Oct. 05, 2016 | Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Common Shares |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Common stock repurchased and retired shares |  | 41,912 |  |
R A I T Financial Trust |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Asset management fees earned |  | $ 23,000 | $ 137,000 |
Service fees or property management fees payable or receivable |  | 0 |  | $ 0
R A I T Financial Trust | Common Shares |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Common stock repurchased and retired shares | 7,269,719 |  |  |
Shares Services Agreement |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Cost incurred for service provided |  | $ 0 | $ 387,000 |
Term of agreement |  | December 21, 2016 through June 20, 2017 |  |

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