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Commercial Mortgage Loans, Subordinate Loans and Other Lending Assets, Net - Additional Information (Details) £ in Millions |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 24, 2021 USD ($) | Jan. 31, 2020 USD ($) | Jan. 31, 2020 GBP (£) | Dec. 31, 2019 USD ($) | Dec. 31, 2021 USD ($) | Jun. 30, 2021 USD ($) | Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2020 GBP (£) | Jun. 30, 2020 USD ($) | Jun. 30, 2020 GBP (£) | Mar. 31, 2020 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2021 GBP (£) | Jan. 18, 2021 USD ($) | Dec. 31, 2020 GBP (£) | Nov. 30, 2020 USD ($) | Nov. 30, 2020 GBP (£) | Oct. 31, 2020 USD ($) | Dec. 31, 2015 USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% | 100.00% |  |  |  |  |  |  |  |
Principal balance |  |  |  |  |  | $ 7,890,848,000 |  | $ 6,535,079,000 |  |  |  |  |  |  | $ 7,890,848,000 | $ 6,535,079,000 |  |  |  |  |  |  |  |
Reversal of Specific CECL Allowance |  | $ 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  | (30,000,000) | 118,019,000 | $ 13,000,000 |  |  |  |  |  |  |
Total carrying value, net |  |  |  |  |  | 7,857,260,000 |  | 6,496,977,000 |  |  |  |  |  |  | 7,857,260,000 | 6,496,977,000 |  |  |  |  |  |  |  |
Amortized cost of loans in cost recovery |  |  |  |  |  | 404,800,000 |  | 373,500,000 |  |  |  |  |  |  | 404,800,000 | 373,500,000 |  |  |  |  |  |  |  |
Interest Receivable |  |  |  |  |  | 41,219,000 |  | 40,559,000 |  |  |  |  |  |  | 41,219,000 | 40,559,000 |  |  |  |  |  |  |  |
Interest received for loans in cost recovery |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,400,000 | 1,800,000 |  |  |  |  |  |  |  |
Payment in kind interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 47,700,000 | 46,700,000 | 54,600,000 |  |  |  |  |  |  |
General CECL (allowance) reversal |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,773,000 | 10,600,000 |  |  |  |  |  |  |  |
Proceeds from pre-payment penalties or accelerated fees |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,500,000 | 200,000 | 6,100,000 |  |  |  |  |  |  |
Proceed from shared appreciation |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,700,000 |  |  |  |  |  |  |  |  |
Realized loss on investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,767,000 | 42,465,000 |  |  |  |  |  |  |  |
Equity method investment, (reversal) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,019,000) |  |  |  |  |  |  |  |
Sale of Mezzanine Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total carrying value, net |  |  |  |  |  | 41,900,000 |  |  |  |  |  |  |  |  | 41,900,000 |  |  |  |  |  |  |  |  |
Realized loss on investment |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  | (800,000) |  |  |  |  |  |  |  |  |
Proceeds from sale of loan |  |  | $ 81,300,000 | £ 62.2 | $ 30,300,000 |  |  |  |  |  | 81,300,000 | £ 62.2 |  |  |  |  |  |  |  |  |  |  |  |
Sale of Unfunded Commitment of Senior Mortgage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of loan |  |  | $ 65,300,000 | £ 50.0 |  |  |  |  |  |  | 65,300,000 | £ 50.0 |  |  |  |  |  |  |  |  |  |  |  |
Sale Of Mezzanine Loan Two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Realized loss on investment |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of loan |  |  |  |  | 122,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Construction Loan Interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments sold |  |  |  |  |  |  |  |  | $ 376,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Funded amount of interests sold |  |  |  |  |  |  |  |  | 127,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on loan interests sold |  |  |  |  |  |  |  |  | 1,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Inventory Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on loan interests sold |  |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding principal on loan |  |  |  |  |  |  |  |  | $ 124,200,000 | £ 97.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale Of Residential-For-Sale Inventory Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total carrying value, net |  |  |  |  |  |  |  | 73,400,000 |  |  |  |  |  |  |  | 73,400,000 |  |  |  |  |  |  |  |
Realized loss on investment |  |  |  |  |  |  |  | 2,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  |  | 7,890,848,000 |  | 6,535,079,000 |  |  |  |  |  |  | 7,890,848,000 | 6,535,079,000 |  |  |  |  |  |  |  |
Reversal of Specific CECL Allowance |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30,000,000 |  |  |  |  |  |  |  |  |
Total carrying value, net |  |  |  |  |  | 97,800,000 |  | 136,100,000 |  |  |  |  |  |  | 97,800,000 | 136,100,000 |  |  |  |  |  |  |  |
Realized loss on investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (20,767,000) |  |  |  |  |  |  |  |  |
Subordinate Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  |  | 855,982,000 |  |  |  |  |  |  |  |  | 855,982,000 |  |  |  |  |  |  |  |  |
Total carrying value, net | [1] |  |  |  |  | 844,948,000 |  | 1,045,893,000 |  |  |  |  |  |  | 844,948,000 | 1,045,893,000 |  |  |  |  |  |  |  |
Payment in kind interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 800,000 |  |  |  |  |  |  |  |
Maximum exposure to loss |  |  |  |  |  | 64,600,000 |  | 68,100,000 |  |  |  |  |  |  | $ 64,600,000 | $ 68,100,000 |  |  |  |  |  |  |  |
Maximum exposure to loss, term |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 years 6 months | 5 years 9 months 18 days |  |  |  |  |  |  |  |
Subordinate Mortgage Portfolio Segment | Residential Real Estate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt related to real estate owned, held for sale |  |  |  |  |  | 31,200,000 |  |  |  |  |  |  |  |  | $ 31,200,000 |  |  |  |  |  |  |  |  |
Realized loss on investment |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Urban Retail |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.00% | 10.00% |  |  |  |  |  |  |  |
Principal balance |  |  |  |  |  | 711,592,000 |  | 655,456,000 |  |  |  |  |  |  | $ 711,592,000 | $ 655,456,000 |  |  |  |  |  |  |  |
Total carrying value, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 422,700,000 | £ 309.2 |  |
Urban Retail | Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total carrying value, net |  |  |  |  |  | 352,800,000 |  | 338,400,000 |  |  |  |  |  |  | 352,800,000 | 338,400,000 |  | £ 260.7 |  | £ 247.5 | $ 338,400,000 | £ 247.5 |  |
Past Due 30-59 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortized cost of loans in cost recovery |  |  |  |  |  |  |  | 19,000,000 |  |  |  |  |  |  |  | 19,000,000 |  |  |  |  |  |  |  |
Past Due 90 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortized cost of loans in cost recovery |  |  |  |  |  | 757,600,000 |  | 711,900,000 |  |  |  |  |  |  | 757,600,000 | 711,900,000 |  |  | $ 352,800,000 |  |  |  |  |
Hotel - New York City |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 157,800,000
Financing receivable, contribution of additional equity, borrowing of loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,000,000 |  |  |  |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring |  |  |  |  |  | 142,800,000 |  | 142,800,000 |  |  |  |  |  |  | 142,800,000 | 142,800,000 |  |  |  |  |  |  |  |
Amortized cost prior to Specific CECL Allowance |  |  |  |  |  | 145,300,000 |  | 144,700,000 |  |  |  |  |  |  | 145,300,000 | 144,700,000 |  |  |  |  |  |  |  |
Reversal of Specific CECL Allowance |  |  |  |  |  |  | $ (15,000,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Hotel - Pittsburgh, PA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing receivable, contribution of additional equity, borrowing of loan |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11,000,000 |  |  |  |  |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring |  |  |  |  |  | 25,700,000 |  | 21,600,000 |  |  |  |  |  |  | 25,700,000 | 21,600,000 |  |  |  |  |  |  |  |
Amortized cost prior to Specific CECL Allowance |  |  |  |  |  | 25,600,000 |  | 21,500,000 |  |  |  |  |  |  | 25,600,000 | 21,500,000 |  |  |  |  |  |  |  |
Reversal of Specific CECL Allowance |  |  |  |  |  |  |  | $ (9,500,000) |  |  |  |  |  | 9,500,000 |  |  |  |  |  |  |  |  |  |
Total carrying value, net |  |  |  |  |  |  |  |  |  |  |  |  |  | 38,500,000 |  |  |  |  |  |  |  |  |  |
Payments for (proceeds from) loans receivable |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,900,000 |  |  |  |  |  |  |  |  |  |
Commitment to lend |  |  |  |  |  | 11,400,000 |  |  |  |  |  |  |  |  | 11,400,000 |  |  |  |  |  |  |  |  |
Retail New York | Sale of Mezzanine Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total carrying value, net |  |  |  |  | $ 470,800,000 |  |  |  |  |  |  |  |  |  |  |  | 470,800,000 |  |  |  |  |  |  |
Proceeds from sale of loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30,300,000 |  |  |  |  |  |  |
Transferor's continuing involvement, arrangements of financial support, amount |  |  |  |  |  | 318,100,000 |  |  |  |  |  |  |  |  | 318,100,000 |  |  |  |  |  |  |  |  |
Retail New York | Sale Of Mezzanine Loan Two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 122,300,000 |  |  |  |  |  |  |
Residential Condominium - Bethesda, MD |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 80,000,000 |
Reversal of Specific CECL Allowance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,100,000 |  |  |  |  |  |  |  |
Gain (loss) on loan interests sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (14,100,000) |  |  |  |  |  |  |  |  |
Residential Condominium - Bethesda, MD | Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reversal of Specific CECL Allowance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,100,000 |  |  |  |  |  |  |  |
Realized loss on investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11,100,000 |  |  |  |  |  |  |  |
Floating Rate Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 98.00% | 95.00% |  |  |  |  |  |  |  |
Mezzanine Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total carrying value, net |  |  |  |  |  | 473,200,000 |  |  |  |  |  |  |  |  | $ 473,200,000 |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  | 471,000,000 |  |  |  |  |  |  |  |  | 471,000,000 |  |  |  |  |  |  |  |  |
Payment in kind interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 178,000,000 |  |  |  |  |  |  |  |  |
Mezzanine Loans | Subordinate Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reversal of Specific CECL Allowance |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,000,000 |  |  |  |  |  |  |  |  |  |  |
Senior Mezzanine Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total carrying value, net |  |  |  |  |  | 238,400,000 |  |  |  |  |  |  |  |  | 238,400,000 |  |  |  |  |  |  |  |  |
Junior Mezzanine A Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total carrying value, net |  |  |  |  |  | 152,800,000 |  |  |  |  |  |  |  |  | 152,800,000 |  |  |  |  |  |  |  |  |
Junior Mezzanine B Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total carrying value, net |  |  |  |  |  | $ 82,000,000 |  |  |  |  |  |  |  |  | $ 82,000,000 |  |  |  |  |  |  |  |  |
[1] | Net of $178,588 and $213,102 CECL Allowances in 2021 and 2020, respectively, comprised of $145,000 a nd $175,000 Specific CECL Allowance and $33,588 and $38,102 General CECL Allowance, respectively.

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