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Related Party Transactions and Arrangements - Additional Information (Detail) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
May 07, 2013 Property | Jun. 30, 2016 USD ($) | Jun. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) $ / shares | Jun. 30, 2015 USD ($) | Dec. 31, 2015 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |
Management fee of our cumulative equity raised |  |  |  | 0.375% |  |
Advisor incentive fee |  | 20.00% |  | 20.00% |  |
Internal return per share | $ / shares |  |  |  | $ 0.20 |  |
Dividends paid, common stock |  |  |  | $ 17,013 |  |
RAIT |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Ownership percentage |  |  |  | 15.40% |  | 15.50%
Dividends paid, common stock |  | $ 1,308 | $ 1,308 | $ 2,617 | $ 2,617 |
Advisor |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Quarterly management fee as percentage of average real estate assets | 0.1875% |  |  |  |  |
Number of properties excluded from computation of base management fee | Property | 8 |  |  |  |  |
Asset management fees earned |  | 1,784 | 1,046 | 3,415 | 2,047 |
Incentive fee earned by the advisor |  | 79 | 214 | 144 | 425 |
Advisor | Incentive Fees |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Incentive fees payable to advisor |  | 1,793 |  | $ 1,793 |  | $ 1,854
Advisor | If IROP elects to extend its maturity |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Advisor incentive fee | 0.00% |  |  |  |  |
Advisor | If IROP elects to extend its maturity | Maximum |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Cumulative gross amount of equity capital, hurdle rate | 1.75% |  |  |  |  |
Cumulative gross amount of equity capital, annual hurdle rate | 7.00% |  |  |  |  |
Advisor | if pre-incentive fee Core FFO exceeds hurdle rate |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Advisor incentive fee | 20.00% |  |  |  |  |
Advisor | if pre-incentive fee Core FFO exceeds hurdle rate | Minimum |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Cumulative gross amount of equity capital, hurdle rate | 1.75% |  |  |  |  |
Cumulative gross amount of equity capital, annual hurdle rate | 7.00% |  |  |  |  |
Property Manager |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Percentage of gross revenues from the property |  |  |  | 4.00% |  |
Payment of property management and construction management fees |  | 1,229 | $ 764 | $ 2,491 | $ 1,519 |
Property Manager | Accounts Payable and Accrued Expenses |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Management and construction fee payable |  | $ 0 |  | $ 0 |  | $ 440

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