Fair Value (Narrative) (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Other Property
Loss severities - maximum	79.00%	[1]
Securitization Vehicles | Subordinated interests in mortgages
Principal Balance	82,100
Maturity	2012-02-28
Coupon or Weighted Average Coupon	3.70%
Number of loans - reported at fair value	6
Securitization Vehicles | Subordinated interests in mortgages | Hotel Loan
Principal Balance	60,900
Number of loans - reported at fair value	3
Securitization Vehicles | Subordinated interests in mortgages | Office Loan
Principal Balance	6,600
Number of loans - reported at fair value	1
Securitization Vehicles | Subordinated interests in mortgages | Retail Loan
Principal Balance	4,400
Number of loans - reported at fair value	1
Securitization Vehicles | Subordinated interests in mortgages | Other Property
Principal Balance	10,200
Number of loans - reported at fair value	1
CT Legacy REIT
Discount Rate	20.00%
Discount rate, basis point change	100
Basis point change, amount	2,300
CT Legacy REIT | Minimum
Loss severities - maximum	0.00%
CT Legacy REIT | Maximum
Loss severities - maximum	100.00%

[1] In certain cases a loss severity based on inputs from parties including appraisals on, and bids for, underlying collateral were utilized to compute the fair value of the impaired loans.