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Related Party Transactions and Arrangements - Additional Information (Detail) $ / shares in Units, $ in Thousands		3 Months Ended			9 Months Ended		12 Months Ended
	May 07, 2013 Property	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($) Property	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) $ / shares	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)	Sep. 27, 2016 shares
Related Party Transaction [Line Items]
Management fee percentage					0.375%
Advisor incentive fee		20.00%			20.00%
Internal return per share | $ / shares					$ 0.20
Dividends paid, common stock					$ 25,512
Dividends distributions payable		$ 3,009			$ 3,009		$ 3,006
Exit fees pursuant to mortgage indebtedness						$ 23,219
RAIT
Related Party Transaction [Line Items]
Ownership percentage					15.40%		15.50%
Dividends paid, common stock		1,309		$ 1,309	$ 3,927	3,926
Dividends distributions payable		436			436		$ 436
Repayment of term loan facility			$ 38,075
Exit fees pursuant to mortgage indebtedness		0			486
Number of property dispositions | Property			2
Maximum
Related Party Transaction [Line Items]
Common stock shares agreed to be repurchased | shares								7,269,719
Advisor
Related Party Transaction [Line Items]
Management fee percentage	0.1875%
Number of properties excluded from computation of base management fee | Property	8
Asset management fees earned		1,727		1,259	5,141	3,306
Incentive fee earned by the advisor		206		0	350	425
Advisor | Incentive Fees
Related Party Transaction [Line Items]
Advisor and management fees payable		3,726			$ 3,726		1,854
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]
Management fee percentage					4.00%
Payment of property management and construction management fees		1,219		$ 861	$ 3,710	$ 2,381
Property Manager | Accounts Payable and Accrued Expenses
Related Party Transaction [Line Items]
Advisor and management fees payable		$ 0			$ 0		$ 440

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