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Related Party Transactions and Arrangements - Additional Information (Detail) $ / shares in Units, $ in Thousands		3 Months Ended		12 Months Ended
	May. 07, 2013 Property	Mar. 31, 2016 USD ($) $ / shares	Mar. 31, 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%
Internal return per share | $ / shares		$ 0.20
Dividends paid, common stock		$ 8,519
RAIT
Related Party Transaction [Line Items]
Ownership percentage		15.40%		15.50%
Dividends paid, common stock		$ 1,309	$ 1,309
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		1,631	1,001
Incentive fees expense for advisor		65	211
Advisor | Incentive Fees
Related Party Transaction [Line Items]
Incentive fees payable to advisor		$ 1,696	1,856
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%
Property management and leasing fees		$ 1,262	$ 755
Property Manager | Accounts Payable and Accrued Expenses
Related Party Transaction [Line Items]
Property management and leasing fees payable		$ 428		$ 263

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