Quarterly report pursuant to Section 13 or 15(d)

Mortgage Loans Held for Sale, at Fair Value - Summary of Cash Flows between Transferor and Transferee Resulted from Sale of Mortgage Loans held for Sale (Detail)

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Mortgage Loans Held for Sale, at Fair Value - Summary of Cash Flows between Transferor and Transferee Resulted from Sale of Mortgage Loans held for Sale (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Cash Flows From Sale of Mortgage Loans Held For Sale [Line Items]          
Sales proceeds $ 5,529,393 $ 6,387,933 $ 2,464,412 $ 10,710,950 $ 5,333,372
Fair value of retained beneficial interest [1] 51,747 66,400 53,401 101,055 98,256
Gross servicing fees received 14,878 13,877 5,677 29,156 7,501
Repurchases (5,320) (4,144) (10,169) (12,138) (18,716)
Gain $ 200,758 $ 284,948 $ 369,473 $ 397,887 $ 661,144
[1] Fair value of retained beneficial interest includes retained servicing rights and other beneficial interests retained as of the statement of financial condition date.