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Fair Value of Financial Instruments (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Restricted cash $ 76 $ 62,457 $ 62,324
Securities, held-to-maturity 0 146,352  
Level 1 [Member] | Carrying Value [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Cash and cash equivalents 140,229 200,996  
Restricted cash 76 62,457  
Level 1 [Member] | Estimated Fair Value [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Cash and cash equivalents 140,229 200,996  
Restricted cash 76 62,457  
Level 3 [Member] | Carrying Value [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Securities, held-to-maturity 0 146,352  
Borrowings under repurchase agreements (1,289,515) (1,146,566)  
Level 3 [Member] | Carrying Value [Member] | Commercial Mortgage Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Commercial mortgage and subordinate loans 2,218,222 1,641,856  
Level 3 [Member] | Carrying Value [Member] | Subordinate Mortgage Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Commercial mortgage and subordinate loans 1,340,378 1,051,236  
Level 3 [Member] | Estimated Fair Value [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Securities, held-to-maturity 0 146,352  
Borrowings under repurchase agreements (1,288,982) (1,146,807)  
Level 3 [Member] | Estimated Fair Value [Member] | Commercial Mortgage Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Commercial mortgage and subordinate loans 2,235,084 1,648,896  
Level 3 [Member] | Estimated Fair Value [Member] | Subordinate Mortgage Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Commercial mortgage and subordinate loans 1,323,249 1,060,882  
Level 3 [Member] | Participating Mortgages [Member] | Carrying Value [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Participations sold 0 (84,979)  
Level 3 [Member] | Participating Mortgages [Member] | Estimated Fair Value [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Participations sold 0 (85,072)  
2019 Notes [Member] | Level 1 [Member] | Carrying Value [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2019 Notes (251,438) (249,994)  
2019 Notes [Member] | Level 1 [Member] | Estimated Fair Value [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2019 Notes (277,041) (268,124)  
2022 Notes [Member] | Level 1 [Member] | Carrying Value [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2019 Notes (220,473) 0  
2022 Notes [Member] | Level 1 [Member] | Estimated Fair Value [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2019 Notes $ (234,025) $ 0