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Investments in Loans - Additional Information (Detail)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2016
USD ($)
Loan
Mar. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
Loan
Accounts Notes And Loans Receivable [Line Items]      
Number of Loans | Loan 1    
Commercial real estate loans on non-accrual status $ 1,614,712   $ 1,627,121
Average impaired loans unpaid balance 132,113 $ 80,903  
Interest income from impaired loans 1,262 $ 582  
Transfer of commercial real estate loan to real estate owned $ 0    
Commercial mortgages      
Accounts Notes And Loans Receivable [Line Items]      
Number of Loans | Loan 121 [1]   124 [2]
Commercial real estate loans on non-accrual status $ 1,421,060 [1]   $ 1,427,328 [2]
Commercial real estate loans on non-accrual status 1,420,059 [1]   1,426,279 [2]
Watchlist      
Accounts Notes And Loans Receivable [Line Items]      
Commercial real estate loans on non-accrual status 131,989   132,237
Unpaid principal balance constituted a TDR 54,189   54,437
Watchlist | Commercial mortgages      
Accounts Notes And Loans Receivable [Line Items]      
Commercial real estate loans on non-accrual status 90,445   90,445
Unpaid principal balance constituted a TDR $ 15,645   $ 15,645
Commercial Portfolio Segment      
Accounts Notes And Loans Receivable [Line Items]      
Modification troubled debt restructuring, subsequently defaulted, number of loans | Loan 0    
Modification troubled debt restructuring, number of loans | Loan 0    
Commercial Portfolio Segment | Minimum      
Accounts Notes And Loans Receivable [Line Items]      
Loan maturity 90 days   90 days
Commercial Portfolio Segment | 90 days or more      
Accounts Notes And Loans Receivable [Line Items]      
Commercial real estate loans on non-accrual status $ 35,689   $ 35,937
Weighted-average interest rate 4.60%   4.60%
Commercial Portfolio Segment | Recognizing interest on the cash basis      
Accounts Notes And Loans Receivable [Line Items]      
Weighted-average interest rate 12.90%   11.60%
Number of Loans | Loan 3   2
Commercial real estate loans on non-accrual status $ 25,871   $ 13,002
Commercial Portfolio Segment | Troubled Debt Restructured Loans      
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
[1] Commercial mortgages includes seven conduit loans with an unpaid principal balance and carrying amount of $57,928, a weighted-average coupon of 4.9% and maturity dates ranging from December 2020 through February 2026. These commercial mortgages are accounted for as loans held for sale.
[2] Commercial mortgages 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.