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Investments in Loans - Additional Information (Detail)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Apr. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
Loan
Jun. 30, 2015
USD ($)
Loan
Dec. 31, 2015
USD ($)
Loan
Accounts Notes And Loans Receivable [Line Items]            
Number of Loans | Loan       1    
Average impaired loans watchlist/unpaid balance   $ 130,496 $ 85,877 $ 131,076 $ 84,291  
Interest income from watchlist/impaired loans   1,134 $ 634 2,522 $ 685  
Transfer of commercial real estate loan to real estate owned $ 332          
Real estate related assets 18,380          
Indebtedness 17,696 3,005,259   3,005,259   $ 3,328,082
Charge off upon the conversion $ 1,203          
Watchlist | Commercial mortgage loans            
Accounts Notes And Loans Receivable [Line Items]            
Unpaid principal balance constituted a TDR   15,645   $ 15,645    
Commercial Portfolio Segment            
Accounts Notes And Loans Receivable [Line Items]            
Number of Loans | Loan       166   188
Commercial real estate loans on non-accrual status   1,496,821   $ 1,496,821   $ 1,627,121
Modification troubled debt restructuring, subsequently defaulted, number of loans | Loan         0  
Modification troubled debt restructuring, number of loans | Loan       0    
Commercial Portfolio Segment | Commercial mortgage loans            
Accounts Notes And Loans Receivable [Line Items]            
Number of Loans | Loan       109 [1]   124 [2]
Commercial real estate loans on non-accrual status   1,315,301 [1]   $ 1,315,301 [1]   $ 1,427,328 [2]
Commercial Portfolio Segment | Watchlist            
Accounts Notes And Loans Receivable [Line Items]            
Commercial real estate loans on non-accrual status   129,002   129,002   132,237
Commercial Portfolio Segment | Watchlist | Commercial mortgage loans            
Accounts Notes And Loans Receivable [Line Items]            
Commercial real estate loans on non-accrual status   92,035   $ 92,035   $ 90,445
Minimum | Commercial Portfolio Segment            
Accounts Notes And Loans Receivable [Line Items]            
Loan maturity       90 days   90 days
90 days or more | Commercial Portfolio Segment            
Accounts Notes And Loans Receivable [Line Items]            
Commercial real estate loans on non-accrual status   $ 35,702   $ 35,702   $ 35,937
Weighted-average interest rate   4.30%   4.30%   4.60%
Number of Loans | Loan       3    
Recognizing interest on the cash basis | Commercial Portfolio Segment            
Accounts Notes And Loans Receivable [Line Items]            
Weighted-average interest rate   12.60%   12.60%   11.60%
Number of Loans | Loan       4   2
Commercial real estate loans on non-accrual status   $ 28,933   $ 28,933   $ 13,002
Troubled Debt Restructured Loans | Commercial Portfolio Segment            
Accounts Notes And Loans Receivable [Line Items]            
Number of Loans | Loan       1   1
Commercial real estate loans on non-accrual status   $ 18,500   $ 18,500   $ 18,500
[1] Commercial mortgage loans includes five conduit loans with an unpaid principal balance and carrying amount of $41,455, a weighted-average coupon of 4.8% and maturity dates ranging from June 2025 through July 2026. These commercial mortgages are accounted for as loans held for sale.
[2] Commercial mortgage loans includes six conduit loans with an unpaid principal balance and carrying amount of $49,239, a weighted-average coupon of 4.8% and maturity dates ranging from December 2020 through January 2026. These commercial mortgages are accounted for as loans held for sale.