Quarterly report pursuant to Section 13 or 15(d)

Nonrecourse Debt, at Fair Value - Summary of Nonrecourse Debt at Fair Value (Detail)

v3.21.2
Nonrecourse Debt, at Fair Value - Summary of Nonrecourse Debt at Fair Value (Detail) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Original Issue Amount $ 350,000 $ 350,009
Total nonrecourse debt 5,276,781 5,155,007
Nonrecourse MSR financing liability, at fair value 65,129 14,088
Fair value adjustments 83,822 102,747
Total nonrecourse debt, at fair value $ 5,425,732 5,271,842
2021 FASST HB1 | Securitization of nonperforming HECM loans    
Debt Instrument [Line Items]    
Issue Date February 2021  
Class of Note A, M1, M2, M3, M4, M5  
Final Maturity Date February 2031  
Original Issue Amount $ 571,448  
Total nonrecourse debt $ 537,299  
2021 FASST HB1 | Securitization of nonperforming HECM loans | Minimum [Member]    
Debt Instrument [Line Items]    
Interest Rate 0.90%  
2021 FASST HB1 | Securitization of nonperforming HECM loans | Maximum [Member]    
Debt Instrument [Line Items]    
Interest Rate 9.00%  
2020 FASST HB2 | Securitization of nonperforming HECM loans    
Debt Instrument [Line Items]    
Issue Date July 2020  
Class of Note A, M1, M2, M3, M4, M5  
Final Maturity Date July 2030  
Original Issue Amount $ 594,171  
Total nonrecourse debt $ 446,413 476,147
2020 FASST HB2 | Securitization of nonperforming HECM loans | Minimum [Member]    
Debt Instrument [Line Items]    
Interest Rate 1.71%  
2020 FASST HB2 | Securitization of nonperforming HECM loans | Maximum [Member]    
Debt Instrument [Line Items]    
Interest Rate 7.75%  
2020 FA AST HB1 | Securitization of nonperforming HECM loans    
Debt Instrument [Line Items]    
Issue Date February 2020  
Class of Note A, M1, M2, M3, M4, M5  
Final Maturity Date February 2030  
Original Issue Amount $ 373,912  
Total nonrecourse debt $ 0 298,883
2020 FA AST HB1 | Securitization of nonperforming HECM loans | Minimum [Member]    
Debt Instrument [Line Items]    
Interest Rate 2.00%  
2020 FA AST HB1 | Securitization of nonperforming HECM loans | Maximum [Member]    
Debt Instrument [Line Items]    
Interest Rate 6.00%  
2021 FASST JR 1 | Securitization of non-agency reverse loans    
Debt Instrument [Line Items]    
Issue Date April 2021  
Class of Note A1, A2  
Final Maturity Date April 2026  
Original Issue Amount $ 562,512  
Total nonrecourse debt $ 512,794  
2021 FASST JR 1 | Securitization of non-agency reverse loans | Minimum [Member]    
Debt Instrument [Line Items]    
Interest Rate 1.50%  
2021 FASST JR 1 | Securitization of non-agency reverse loans | Maximum [Member]    
Debt Instrument [Line Items]    
Interest Rate 2.00%  
2019 FASST JR2 | Securitization of non-agency reverse loans    
Debt Instrument [Line Items]    
Issue Date June 2019  
Class of Note A, A2  
Final Maturity Date June 2069  
Interest Rate 2.00%  
Original Issue Amount $ 499,000  
Total nonrecourse debt $ 406,709 440,141
2018 FASST JR1 | Securitization of non-agency reverse loans    
Debt Instrument [Line Items]    
Issue Date May 2018  
Class of Note A  
Final Maturity Date May 2068  
Interest Rate 4.30%  
Original Issue Amount $ 559,197  
Total nonrecourse debt $ 386,548 428,671
2019 FASST JR3 | Securitization of non-agency reverse loans    
Debt Instrument [Line Items]    
Issue Date September 2019  
Class of Note A  
Final Maturity Date September 2069  
Interest Rate 2.00%  
Original Issue Amount $ 450,104  
Total nonrecourse debt $ 359,772 404,057
2020 FASST JR3 | Securitization of non-agency reverse loans    
Debt Instrument [Line Items]    
Issue Date August 2020  
Class of Note A, A2  
Final Maturity Date August 2025  
Original Issue Amount $ 360,713  
Total nonrecourse debt $ 315,570 337,099
2020 FASST JR3 | Securitization of non-agency reverse loans | Minimum [Member]    
Debt Instrument [Line Items]    
Interest Rate 2.00%  
2020 FASST JR3 | Securitization of non-agency reverse loans | Maximum [Member]    
Debt Instrument [Line Items]    
Interest Rate 3.00%  
2019 FASST JR4 | Securitization of non-agency reverse loans    
Debt Instrument [Line Items]    
Issue Date November 2019  
Class of Note A  
Final Maturity Date November 2069  
Interest Rate 2.00%  
Original Issue Amount $ 365,685  
Total nonrecourse debt $ 305,097 335,945
2019 FASST JR1 | Securitization of non-agency reverse loans    
Debt Instrument [Line Items]    
Issue Date March 2019  
Class of Note A  
Final Maturity Date March 2069  
Interest Rate 2.00%  
Original Issue Amount $ 347,000  
Total nonrecourse debt $ 288,654 309,840
2020 FASST JR2 | Securitization of non-agency reverse loans    
Debt Instrument [Line Items]    
Issue Date May 2020  
Class of Note A1A, A1B, A2  
Final Maturity Date May 2023  
Original Issue Amount $ 305,658  
Total nonrecourse debt $ 277,694 291,827
2020 FASST JR2 | Securitization of non-agency reverse loans | Minimum [Member]    
Debt Instrument [Line Items]    
Interest Rate 0.00%  
2020 FASST JR2 | Securitization of non-agency reverse loans | Maximum [Member]    
Debt Instrument [Line Items]    
Interest Rate 2.00%  
2018 FASST JR2 | Securitization of non-agency reverse loans    
Debt Instrument [Line Items]    
Issue Date December 2018  
Class of Note A  
Final Maturity Date December 2068  
Interest Rate 4.50%  
Original Issue Amount $ 280,400  
Total nonrecourse debt $ 229,872 253,325
2020 FASST JR1 | Securitization of non-agency reverse loans    
Debt Instrument [Line Items]    
Issue Date April 2020  
Class of Note A, A2  
Final Maturity Date April 2023  
Interest Rate 2.00%  
Original Issue Amount $ 254,805  
Total nonrecourse debt $ 0 240,563
2020 FASST JR4 | Securitization of non-agency reverse loans    
Debt Instrument [Line Items]    
Issue Date October 2020  
Class of Note A, A2  
Final Maturity Date August 2025  
Original Issue Amount $ 241,664  
Total nonrecourse debt $ 197,970 217,385
2020 FASST JR4 | Securitization of non-agency reverse loans | Minimum [Member]    
Debt Instrument [Line Items]    
Interest Rate 2.00%  
2020 FASST JR4 | Securitization of non-agency reverse loans | Maximum [Member]    
Debt Instrument [Line Items]    
Interest Rate 3.00%  
2020 FASST S2 | Securitization of non-agency reverse loans    
Debt Instrument [Line Items]    
Issue Date June 2020  
Class of Note A1, A2  
Final Maturity Date March 2025  
Interest Rate 2.00%  
Original Issue Amount $ 320,460  
Total nonrecourse debt $ 286,734 299,401
2020 FASST S3 | Securitization of non-agency reverse loans    
Debt Instrument [Line Items]    
Issue Date December 2020  
Class of Note A1, A2  
Final Maturity Date December 2025  
Original Issue Amount $ 313,357  
Total nonrecourse debt $ 288,383 297,871
2020 FASST S3 | Securitization of non-agency reverse loans | Minimum [Member]    
Debt Instrument [Line Items]    
Interest Rate 1.50%  
2020 FASST S3 | Securitization of non-agency reverse loans | Maximum [Member]    
Debt Instrument [Line Items]    
Interest Rate 2.50%  
2020 FASST S1 | Securitization of non-agency reverse loans    
Debt Instrument [Line Items]    
Issue Date March 2020  
Class of Note A1, A2  
Final Maturity Date March 2025  
Original Issue Amount $ 199,000  
Total nonrecourse debt $ 168,761 181,059
2020 FASST S1 | Securitization of non-agency reverse loans | Minimum [Member]    
Debt Instrument [Line Items]    
Interest Rate 2.00%  
2020 FASST S1 | Securitization of non-agency reverse loans | Maximum [Member]    
Debt Instrument [Line Items]    
Interest Rate 3.70%  
2021 RTL1 ANTLR | Securitization of fix & flip loans    
Debt Instrument [Line Items]    
Issue Date April 2021  
Class of Note A1, A2, M  
Final Maturity Date November 2024 (A1); January 2025 (A2); May 2025 (M)  
Original Issue Amount $ 268,511  
Total nonrecourse debt $ 268,511  
2021 RTL1 ANTLR | Securitization of fix & flip loans | Minimum [Member]    
Debt Instrument [Line Items]    
Interest Rate 2.10%  
2021 RTL1 ANTLR | Securitization of fix & flip loans | Maximum [Member]    
Debt Instrument [Line Items]    
Interest Rate 5.40%  
2020 RTL1 ANTLR | Securitization of fix & flip loans    
Debt Instrument [Line Items]    
Issue Date May 2020  
Class of Note A1, A2  
Final Maturity Date May 2022 (A1, A2)  
Original Issue Amount $ 306,517  
Total nonrecourse debt   140,072
2020 RTL1 ANTLR | Securitization of fix & flip loans | Minimum [Member]    
Debt Instrument [Line Items]    
Interest Rate 6.90%  
2020 RTL1 ANTLR | Securitization of fix & flip loans | Maximum [Member]    
Debt Instrument [Line Items]    
Interest Rate 8.00%  
2018 RTL1 ANTLR | Securitization of fix & flip loans    
Debt Instrument [Line Items]    
Issue Date September 2018  
Class of Note A1, A2, A-VFN, M  
Final Maturity Date July 2022 (A1, A2); March 2023 (M)  
Original Issue Amount $ 210,296  
Total nonrecourse debt   80,949
2018 RTL1 ANTLR | Securitization of fix & flip loans | Minimum [Member]    
Debt Instrument [Line Items]    
Interest Rate 4.30%  
2018 RTL1 ANTLR | Securitization of fix & flip loans | Maximum [Member]    
Debt Instrument [Line Items]    
Interest Rate 7.40%  
2019 RTL1 ANTLR | Securitization of fix & flip loans    
Debt Instrument [Line Items]    
Issue Date March 2019  
Class of Note A1, A2, A-VFN, M  
Final Maturity Date June 2022 (A1, A2); January 2023 (M)  
Original Issue Amount $ 217,100  
Total nonrecourse debt   $ 121,772
2019 RTL1 ANTLR | Securitization of fix & flip loans | Minimum [Member]    
Debt Instrument [Line Items]    
Interest Rate 4.50%  
2019 RTL1 ANTLR | Securitization of fix & flip loans | Maximum [Member]    
Debt Instrument [Line Items]    
Interest Rate 6.90%