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Fair Value of Financial Instruments - Carrying Value and Estimated Fair Value of Company's Financial Instruments (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Restricted cash $ 30,127 $ 0
Carrying Value [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Cash and cash equivalents 20,096 108,619
Restricted cash 30,127 0
Borrowings under repurchase agreements (202,033) (225,158)
Carrying Value [Member] | Level 3 [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial first mortgage loans 161,099 142,921
Subordinate loans 497,484 246,246
Repurchase agreements 0 6,598
Estimated Fair Value [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Cash and cash equivalents 20,096 108,619
Restricted cash 30,127 0
Borrowings under repurchase agreements (202,148) (225,158)
Estimated Fair Value [Member] | Level 3 [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial first mortgage loans 164,405 150,144
Subordinate loans 503,267 250,520
Repurchase agreements $ 0 $ 6,598