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Repurchase Agreement - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
CDO Bond [Member]
Securities
Dec. 31, 2013
Repurchase Facility [Member]
extension
Dec. 31, 2011
Repurchase Facility [Member]
Line of Credit Facility [Line Items]          
Line of credit, amount outstanding $ 202,033 $ 225,158     $ 47,439
Investment, Face Amount     $ 68,726    
Advance rate on face amount     69.00%    
Number of senior and subordinate commercial real estate debt positions and commercial real estate securities included in CDO     58    
Interest rate for repurchase facility       13.00%  
Current pay interest rate       10.00%  
Accrual interest rate       3.00%  
Expiration period       18 months  
Number of extensions       3  
Option to extend, term       6 months  
Internal rate of return     17.00%