Derivative Financial Instruments - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Derivative [Line Items]
Notional value of discontinued cash flow hedges	$ 1,123,770		$ 1,123,770		$ 1,146,720
Realized losses	8,098	8,940	16,384	17,850
Liability Of hedge Accounting	(121,930)		(121,930)		(150,305)
RAIT I and RAIT II
Derivative [Line Items]
Weighted average strike rate	0.0525%		0.0525%
Notional value of discontinued cash flow hedges	28,100		28,100
Discontinued cash flow hedges
Derivative [Line Items]
Notional value of discontinued cash flow hedges	561,151		561,151
Liability Of hedge Accounting	$ 67,078		$ 67,078