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Investments in Loans (Detail)
$ in Thousands
1 Months Ended 12 Months Ended
Apr. 30, 2016
Loan
Dec. 31, 2016
USD ($)
Loan
Dec. 31, 2015
USD ($)
Loan
Mortgage Loans On Real Estate [Line Items]      
Unpaid Principal Balance   $ 1,294,874  
Number of Loans | Loan 1 134  
Commercial Portfolio Segment      
Mortgage Loans On Real Estate [Line Items]      
Unpaid Principal Balance   $ 1,294,874 $ 1,627,121
Total investment in loans, Unamortized (Discounts) Premiums   (808) (1,268)
Carrying Amount   $ 1,294,066 $ 1,625,853
Number of Loans | Loan   134 188
Weighted-Average Coupon [1]   6.10% 6.10%
Deferred fees   $ (1,427) $ (2,270)
Total investments in loans, Unpaid Principal Balance   1,293,447 1,624,851
Commercial mortgages, mezzanine loans and other loans, Carrying Amount   1,292,639 1,623,583
Commercial mortgage loans      
Mortgage Loans On Real Estate [Line Items]      
Unpaid Principal Balance   1,162,233  
Commercial mortgage loans | Commercial Portfolio Segment      
Mortgage Loans On Real Estate [Line Items]      
Unpaid Principal Balance   1,162,233 [2] 1,427,328 [3]
Total investment in loans, Unamortized (Discounts) Premiums   (852) [2] (1,049) [3]
Carrying Amount   $ 1,161,381 [2] $ 1,426,279 [3]
Number of Loans | Loan   94 [2] 124 [3]
Weighted-Average Coupon [1]   5.80% [2] 5.20% [3]
Range of Maturity Dates, Minimum   Jan. 31, 2017 [2] Mar. 31, 2016 [3],[4]
Range of Maturity Dates, Maximum   Dec. 31, 2025 [2] Jan. 01, 2029 [3],[4]
Mezzanine Loans      
Mortgage Loans On Real Estate [Line Items]      
Unpaid Principal Balance   $ 89,811  
Number of Loans | Loan   23  
Mezzanine Loans | Commercial Portfolio Segment      
Mortgage Loans On Real Estate [Line Items]      
Unpaid Principal Balance   $ 89,811 $ 169,556
Total investment in loans, Unamortized (Discounts) Premiums   45 (218)
Carrying Amount   $ 89,856 $ 169,338
Number of Loans | Loan   23 57
Weighted-Average Coupon [1]   9.90% 10.00%
Range of Maturity Dates, Minimum   Feb. 28, 2017 Jan. 31, 2016 [4]
Range of Maturity Dates, Maximum   Jun. 30, 2027 May 01, 2025 [4]
Preferred Equity Interests      
Mortgage Loans On Real Estate [Line Items]      
Unpaid Principal Balance   $ 42,830  
Preferred Equity Interests | Commercial Portfolio Segment      
Mortgage Loans On Real Estate [Line Items]      
Unpaid Principal Balance   42,830 $ 30,237
Total investment in loans, Unamortized (Discounts) Premiums   (1) (1)
Carrying Amount   $ 42,829 $ 30,236
Number of Loans | Loan   17 7
Weighted-Average Coupon [1]   8.20% 6.90%
Range of Maturity Dates, Minimum   Jan. 31, 2017 Feb. 29, 2016 [4]
Range of Maturity Dates, Maximum   Jan. 31, 2029 Aug. 01, 2025 [4]
[1] Weighted-average coupon is calculated on the unpaid principal balance, which does not necessarily correspond to the carrying amount.
[2] 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.
[3] Commercial mortgage loans include six conduit loans with unpaid principal balances and carrying amounts totaling $49,239, a weighted-average coupon of 4.8%, and maturity dates ranging from December 2020 through January 2026. These commercial mortgage loans are accounted for as loans held for sale.
[4] Does not include the maturity dates of three mezzanine loans that were 90 days or more past due which had contractual maturity dates prior to December 31, 2015.