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Investments in Commercial Mortgage Loans, Mezzanine Loans and Preferred Equity Interests - Additional Information (Detail)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
USD ($)
Loan
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Loan
Jun. 30, 2016
USD ($)
Loan
Dec. 31, 2016
USD ($)
Loan
Accounts Notes And Loans Receivable [Line Items]          
Provision for loan losses $ 20,863 $ 1,344 $ 22,398 $ 2,669  
Average impaired loans unpaid balance 151,807 130,496 152,007 131,076  
Interest income from impaired loans 124 1,134 $ 344 2,522  
Commercial mortgage loans          
Accounts Notes And Loans Receivable [Line Items]          
Number of Loans | Loan     1    
Provision for loan losses 12,623 1,069 $ 13,322 $ 1,243  
Carrying Value, Transfer of commercial mortgage loan to real estate owned     1,590    
Charge off upon the conversion     $ 360    
Commercial Portfolio Segment          
Accounts Notes And Loans Receivable [Line Items]          
Number of Loans | Loan     129 [1]   134 [2]
Commercial real estate loans on non-accrual status 1,271,253 [1]   $ 1,271,253 [1]   $ 1,294,874 [2]
Modification troubled debt restructuring, subsequently defaulted, number of loans | Loan     0    
Commercial Portfolio Segment | Commercial mortgage loans          
Accounts Notes And Loans Receivable [Line Items]          
Number of Loans | Loan     94 [3]   94 [4]
Commercial real estate loans on non-accrual status $ 1,158,504 [3]   $ 1,158,504 [3]   $ 1,162,233 [4]
Commercial Portfolio Segment | One Commercial Mortgage Loan          
Accounts Notes And Loans Receivable [Line Items]          
Modification troubled debt restructuring, number of loans | Loan 1   1 1  
Unpaid principal balance constituted a TDR $ 6,009 $ 15,645 $ 6,009 $ 15,645  
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 $ 122,054   $ 122,054   $ 121,038
Weighted-average interest rate 6.60%   6.60%   5.80%
Recognizing interest on the cash basis | Commercial Portfolio Segment          
Accounts Notes And Loans Receivable [Line Items]          
Weighted-average interest rate 12.90%   12.90%   12.90%
Number of Loans | Loan     3   3
Commercial real estate loans on non-accrual status $ 20,625   $ 20,625   $ 20,625
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
Loans Originated Prior to 2010          
Accounts Notes And Loans Receivable [Line Items]          
Number of Loans | Loan 5        
Provision for loan losses $ 20,863   $ 22,398    
[1] Includes $151,952 of cash flow loans, of which $94,986 are commercial mortgage loans, $21,171 are mezzanine loans and $35,795 are preferred equity interests. See Note 2: Summary of Significant Accounting Policies, (i) Revenue Recognition, for further discussion of our cash flow loans.
[2] Includes $155,750 of cash flow loans, of which $98,784 are commercial mortgage loans, $21,171 are mezzanine loans and $35,795 are preferred equity interests. See Note 2: Summary of Significant Accounting Policies, (i) Revenue Recognition, for further discussion of our cash flow loans.
[3] Commercial mortgage loans include one conduit loan with an unpaid principal balance and carrying amount of $16,801, a weighted-average coupon of 4.8%, and a maturity date of December 2025. This commercial mortgage loan is accounted for as a loan held for sale.
[4] Commercial mortgage loans include two conduit loans with unpaid principal balances and carrying amounts totaling $20,181, a weighted-average coupon of 4.8%, and maturity dates ranging from June 2025 through December 2025. These commercial mortgage loans are accounted for as loans held for sale.