Derivative Financial Instruments - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Derivative [Line Items]
Notional amount	$ 1,122,659		$ 1,122,659		$ 1,107,447
Realized losses	7,243	8,098	14,780	16,384
Discontinued Interest Rate Swaps
Derivative [Line Items]
Notional amount	561,151		561,151
Liability Of hedge Accounting	61,363		61,363
Interest rate swaps
Derivative [Line Items]
Notional amount	1,086,659		1,086,659		1,071,447
RAIT I and RAIT II | Interest rate swaps
Derivative [Line Items]
Weighted average strike rate	5.25%		5.25%
Notional amount	$ 43,000		$ 43,000
Derivative, inception date			Jul. 01, 2014
Derivative, maturity date			Dec. 31, 2014