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Related Party Transactions and Arrangements - Additional Information (Detail) $ / shares in Units, $ in Thousands				12 Months Ended
	Dec. 20, 2016	Oct. 05, 2016 shares	May 07, 2013 Property	Dec. 31, 2016 USD ($) Property $ / shares	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Related Party Transaction [Line Items]
Management fee percentage				0.375%
External advisor incentive fee				20.00%
Internal return per share | $ / shares				$ 0.20
Common stock repurchased and retired shares | shares		7,269,719
Dividends paid, common stock				$ 37,880	$ 26,014	$ 16,368
Exit fees pursuant to mortgage indebtedness					23,219
Cash paid for interest				33,034	22,105	9,170
Reimbursement of compensation expense to employees				$ 1,222	$ 495	206
RAIT
Related Party Transaction [Line Items]
Ownership percentage				0.00%	15.50%
Dividends paid, common stock				$ 3,926	$ 5,234	5,126
Repayment of term loan facility				$ 38,075
Number of property dispositions | Property				2
Exit fees pursuant to mortgage indebtedness				$ 486
Expenses related to shared service agreement				50
Property management fees received				23
Reimbursement of compensation expense to employees				253
RAIT | Common Shares
Related Party Transaction [Line Items]
Common stock repurchased and retired shares | shares		7,269,719
External 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				7,092	4,984	1,582
Incentive fee earned by the external advisor				350	629	154
External Advisor | Incentive Fees
Related Party Transaction [Line Items]
External advisor and management fees payable				0	1,854
External Advisor | If IROP elects to extend its maturity
Related Party Transaction [Line Items]
External advisor incentive fee			0.00%
External 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%
External Advisor | if pre-incentive fee Core FFO exceeds hurdle rate
Related Party Transaction [Line Items]
External advisor incentive fee			20.00%
External 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%
Property management and leasing fees				4,769	3,675	1,759
Property Manager | Accounts Payable and Accrued Expenses
Related Party Transaction [Line Items]
External advisor and management fees payable				0	440
Sponsor
Related Party Transaction [Line Items]
Cash paid for interest				361	965
Sponsor | RAIT
Related Party Transaction [Line Items]
Cash paid for interest				$ 361	$ 965	$ 966

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