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Repurchase Agreement (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 3 Months Ended
Mar. 31, 2014
Dec. 31, 2011
CDO Bond [Member]
Securities
Mar. 31, 2014
Repurchase Facility [Member]
extension
Dec. 31, 2011
Repurchase Facility [Member]
Line of Credit Facility [Line Items]        
Line of credit, amount outstanding $ 166,994     $ 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%