Repurchase Agreement (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012 Securities
Repurchase Agreement Counterparty [Line Items]
Investment in the form of repurchase facility secured by Class A-2 CDO bond	$ 47,439
Total balance of the Company's investment in the repurchase facility	47,439
Interest rate for repurchase facility	13.00%
Current pay interest rate	10.00%
Accrual interest rate	3.00%
Initial term for repurchase facility	18 months with three six-month extensions options
Interest rate for principal repayments that occur prior to the 21st month are subject to a make-whole provision	13.00%
Aggregate face amount of borrowings under repurchase facility	68,726
Advance rate on CDO bond's face amount in percentage	69.00%
Number of senior and subordinate commercial real estate debt positions and commercial real estate securities included in CDO	58
Principal payments received on repurchase agreements	36,464
make-whole interest payment	$ 1,817