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Commercial Mortgage Loans, Subordinate Loans and Other Lending Assets, Net - Additional Information (Details) $ in Thousands, £ in Millions |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 24, 2021 USD ($) | Sep. 30, 2022 USD ($) loan | Sep. 30, 2022 GBP (£) | Jun. 30, 2022 USD ($) | Mar. 31, 2022 USD ($) | Sep. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) | Mar. 31, 2020 USD ($) | Sep. 30, 2022 USD ($) loan | Sep. 30, 2022 GBP (£) | Sep. 30, 2021 USD ($) | Dec. 31, 2021 USD ($) | Sep. 30, 2022 GBP (£) loan | Aug. 03, 2022 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Nov. 30, 2020 USD ($) | Nov. 30, 2020 GBP (£)
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio |  |  |  |  |  |  |  |  |  | 100.00% | 100.00% |  | 100.00% |  |  |  |  |  |
Interest receivable |  |  | $ 61,512 |  |  |  |  |  |  | $ 61,512 |  |  | $ 41,219 |  |  |  |  |  |
Amortized cost of loans in cost recovery |  |  | 661,500 |  |  |  |  |  |  | 661,500 |  |  | 639,600 |  |  |  |  |  |
Interest received for loans in cost recovery |  |  | $ 2,100 |  |  |  | $ 200 |  |  | $ 2,600 |  | $ 1,000 |  |  |  |  |  |  |
Number of loans | loan |  |  | 3 |  |  |  |  |  |  | 3 |  |  |  | 3 |  |  |  |  |
Total carrying value, net |  |  | $ 8,731,306 |  |  |  |  |  |  | $ 8,731,306 |  |  | 7,857,260 |  | $ 226,500 |  |  |  |
Payment in kind interest |  |  | 2,700 |  |  |  | 10,200 |  |  | 8,300 |  | 40,700 |  |  |  |  |  |  |
Specific CECL Allowance, net |  | $ 10,000 | (53,000) |  | $ (10,000) |  |  | $ 20,000 |  | (26,000) |  | (30,000) |  |  |  |  |  |  |
Off-balance sheet, credit loss, liability |  |  | 2,812 |  | $ 3,999 | $ 3,928 | 2,193 | $ 2,444 |  | 2,812 |  | 2,193 | 3,106 |  |  | $ 3,794 | $ 3,365 |  |
Allowance for credit loss, current |  |  | 7,000 |  |  |  |  |  |  | 7,000 |  |  |  |  |  |  |  |  |
Proceeds from pre-payment penalties or accelerated fees |  |  | 100 |  |  |  | 600 |  |  | 2,500 |  | $ 1,200 |  |  |  |  |  |  |
Subordinate Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total carrying value, net | [1],[2] |  | 717,837 |  |  |  |  |  |  | 717,837 |  |  | 844,948 |  |  |  |  |  |
Maximum exposure to loss |  |  | 51,100 |  |  |  |  |  |  | $ 51,100 |  |  | 64,600 |  |  |  |  |  |
Maximum exposure to loss, term |  |  |  |  |  |  |  |  |  | 1 year 8 months 12 days | 1 year 8 months 12 days | 4 years 6 months |  |  |  |  |  |  |
Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total carrying value, net |  |  | 206,800 |  |  |  |  |  |  | $ 206,800 |  |  | 97,800 |  |  |  |  |  |
Specific CECL Allowance, net |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |
Other income |  |  |  |  |  |  | $ 3,700 |  |  |  |  | $ 3,700 |  |  |  |  |  |  |
Urban Retail |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total carrying value, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 422,700 | £ 309.2
Urban Retail | Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total carrying value, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 338,400 | £ 247.5
Mixed Use Property - London | Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Off-balance-sheet, credit loss, liability, transfers |  |  | 327,700 | £ 293.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Office - London, United Kingdom | Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortized cost of loans in cost recovery |  |  | $ 102,600 |  |  |  |  |  |  | $ 102,600 |  |  |  | £ 91.9 |  |  |  |  |
Financing receivable, default interest rate |  |  | 2.00% |  |  |  |  |  |  | 2.00% |  |  |  | 2.00% |  |  |  |  |
Allowance for loan and lease losses, loans sold |  |  |  |  |  |  |  |  |  | $ 22,700 | £ 20.3 |  |  |  |  |  |  |  |
Past Due 90 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortized cost of loans in cost recovery |  |  | $ 661,500 |  |  |  |  |  |  | $ 661,500 |  |  | 757,600 |  |  |  |  |  |
Past Due 30-80 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortized cost of loans in cost recovery |  |  |  |  |  |  |  |  |  |  |  |  | $ 102,600 |  |  |  |  |  |
Floating Rate Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio |  |  |  |  |  | 98.00% |  |  |  | 98.00% | 98.00% |  |  |  |  |  |  |  |
Senior Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total carrying value, net |  |  | 354,000 |  |  |  |  |  |  | $ 354,000 |  |  |  |  |  |  |  |  |
Senior Loans | Residential-For-Sale Property - Manhattan, NY |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total carrying value, net |  |  | 825,000 |  |  |  |  |  |  | 825,000 |  |  |  |  |  |  |  |  |
Mezzanine Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortized cost of loans in cost recovery |  |  | 51,980 |  |  |  |  |  |  | 51,980 |  |  |  |  |  |  |  |  |
Payment in kind interest |  |  |  |  |  |  |  |  |  | 82,500 |  |  |  |  |  |  |  |  |
Mezzanine Loans | Subordinate Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Specific CECL Allowance, net |  |  |  |  |  |  |  |  | $ 10,000 |  |  |  |  |  |  |  |  |  |
Senior Mezzanine Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total carrying value, net |  |  | $ 187,100 |  |  |  |  |  |  | $ 187,100 |  |  |  |  |  |  |  |  |
Senior Mezzanine Loans | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing receivable, basis spread on variable rate |  |  | 15.70% |  |  |  |  |  |  | 15.70% |  |  |  | 15.70% |  |  |  |  |
Senior Mezzanine Loans | Secured Overnight Financing Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing receivable, basis spread on variable rate |  |  | 9.00% |  |  |  |  |  |  | 9.00% |  |  |  | 9.00% |  |  |  |  |
Junior Mezzanine A Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total carrying value, net |  |  | $ 231,900 |  |  |  |  |  |  | $ 231,900 |  |  |  |  |  |  |  |  |
Junior Mezzanine A Loan | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing receivable, basis spread on variable rate |  |  | 22.50% |  |  |  |  |  |  | 22.50% |  |  |  | 22.50% |  |  |  |  |
Junior Mezzanine A Loan | Secured Overnight Financing Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing receivable, basis spread on variable rate |  |  | 15.00% |  |  |  |  |  |  | 15.00% |  |  |  | 15.00% |  |  |  |  |
Junior Mezzanine B Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total carrying value, net |  |  | $ 52,000 |  |  |  |  |  |  | $ 52,000 |  |  |  |  |  |  |  |  |
Specific CECL Allowance, net |  |  |  |  |  |  |  |  |  | $ 30,000 |  |  |  |  |  |  |  |  |
Junior Mezzanine B Loan | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing receivable, basis spread on variable rate |  |  | 17.50% |  |  |  |  |  |  | 17.50% |  |  |  | 17.50% |  |  |  |  |
Junior Mezzanine B Loan | Secured Overnight Financing Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing receivable, basis spread on variable rate |  |  | 15.00% |  |  |  |  |  |  | 15.00% |  |  |  | 15.00% |  |  |  |  |
Senior and Junior Mezzanine Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio |  |  |  |  |  |  |  |  |  | 5.40% | 5.40% |  |  |  |  |  |  |  |
Total carrying value, net |  |  | $ 471,100 |  |  |  |  |  |  | $ 471,100 |  |  |  |  |  |  |  |  |
Unfunded Loan Commitment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total carrying value, net |  |  | 97,800 |  |  |  |  |  |  | 97,800 |  |  |  |  |  |  |  |  |
Off-balance sheet, credit loss, liability |  |  | $ 17,600 |  |  |  |  |  |  | $ 17,600 |  |  |  |  |  |  |  |  |
[1] | Includes $187,138 and $0 pledged as collateral under secured debt arrangements in 2022 and 2021, respectively.
[2] | Net of $140,985 and $178,588 CECL Allowances in 2022 and 2021, respectively, comprised of $119,000 and $145,000 Specific CECL Allowance and $21,985 and $33,588 General CECL Allowance, respectively.

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