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Warehouse Receivables & Warehouse Lines of Credit - Summary of Warehouse Lines of Credit in Place (Parenthetical) (Detail) - Warehouse Agreement Borrowings [Member] - USD ($) |  |  |  |  |  |  |  |  |  |  | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 18, 2021 | Oct. 19, 2020 | Sep. 22, 2020 | Sep. 21, 2020 | Aug. 04, 2020 | Jul. 28, 2020 | Jul. 24, 2020 | Jul. 01, 2020 | Jun. 26, 2020 | Jun. 10, 2020 | Sep. 30, 2020 | Dec. 31, 2019 | Jun. 28, 2019
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Facility Size |  |  | $ 100,000,000.0 |  | $ 100,000,000.0 |  |  |  |  |  | $ 2,900,000,000 | $ 3,400,000,000 |
Current Maturity |  |  | Jan. 20, 2021 |  | Jun. 28, 2021 |  |  |  |  |  |  |  |
Line of credit over LIBOR rate |  |  |  |  | 1.50% |  |  |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Additional line of credit |  |  |  |  |  |  |  |  |  |  |  |  | $ 150,000,000.0
JP Morgan [Member] | Pricing at daily floating rate LIBOR plus 1.30%, maturing October 19, 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Facility Size |  |  |  |  |  |  |  |  |  |  | $ 985,000,000 | $ 985,000,000 |
Current Maturity |  |  |  |  |  |  |  |  |  |  | Oct. 19, 2020 |  |
Line of credit over LIBOR rate |  |  |  |  |  |  |  |  |  |  | 1.30% | 1.30% |
JP Morgan [Member] | Pricing at daily floating rate LIBOR plus 1.30%, maturing October 19, 2020 [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Facility Size |  | $ 1,585,000,000.0 |  |  |  |  |  |  |  |  |  |  |
JP Morgan [Member] | Pricing at daily floating rate LIBOR plus 1.30%, maturing October 19, 2020 [Member] | Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Facility Size | $ 985,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |
Current Maturity | Oct. 18, 2021 |  |  |  |  |  |  |  |  |  |  |  |
Line of credit over LIBOR rate | 1.60% |  |  |  |  |  |  |  |  |  |  |  |
JP Morgan [Member] | Pricing at daily floating rate LIBOR plus 2.75%, maturing October 19, 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Facility Size |  |  |  |  |  |  |  |  |  |  | $ 15,000,000 | $ 15,000,000 |
Current Maturity |  |  |  |  |  |  |  |  |  |  | Oct. 19, 2020 |  |
Line of credit over LIBOR rate |  |  |  |  |  |  |  |  |  |  | 2.75% | 2.75% |
JP Morgan [Member] | Pricing at daily floating rate LIBOR plus 2.75%, maturing October 19, 2020 [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Current Maturity |  | Oct. 18, 2021 |  |  |  |  |  |  |  |  |  |  |
Capital One [Member] | Pricing at daily one-month LIBOR plus 1.25%, maturing July 27, 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Facility Size |  |  |  |  |  |  |  |  |  |  |  | $ 200,000,000 |
Current Maturity |  |  |  |  |  |  |  |  |  |  | Jul. 27, 2020 |  |
Line of credit over LIBOR rate |  |  |  |  |  |  |  |  |  |  | 1.25% | 1.25% |
TD Bank [Member] | Pricing at daily floating rate LIBOR plus 1.15%, maturing June 30, 2021 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Facility Size |  |  |  |  |  |  |  | $ 400,000,000.0 |  |  | $ 800,000,000 | $ 800,000,000 |
Current Maturity |  |  |  | Dec. 31, 2020 |  |  |  | Jun. 30, 2021 |  |  |  |  |
Line of credit over LIBOR rate |  |  |  |  |  |  |  |  |  |  | 1.15% | 1.15% |
Additional line of credit |  |  |  | $ 400,000,000.0 |  |  |  |  |  |  |  |  |
Bank of America (BofA) [Member] | LIBOR daily floating rate plus 1.50% on general facility and LIBOR daily floating rate plus 1.75% on separate sublimit borrowing, maturing on May 26, 2021 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Facility Size |  |  |  |  |  |  |  |  |  | $ 350,000,000.0 | $ 350,000,000 | $ 350,000,000 |
Current Maturity |  |  |  |  |  |  |  |  |  | May 26, 2021 | May 26, 2021 |  |
Bank of America (BofA) [Member] | LIBOR daily floating rate plus 1.50% on general facility and LIBOR daily floating rate plus 1.75% on separate sublimit borrowing, maturing on May 26, 2021 [Member] | Sublimit Borrowing [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Facility Size |  |  |  |  |  |  |  |  |  | $ 100,000,000.0 |  |  |
Line of credit over LIBOR rate |  |  |  |  |  |  | 1.75% |  |  |  |  |  |
Bank of America (BofA) [Member] | LIBOR daily floating rate plus 1.50% on general facility and LIBOR daily floating rate plus 1.75% on separate sublimit borrowing, maturing on May 26, 2021 [Member] | General Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit over LIBOR rate |  |  |  |  |  |  | 1.40% |  |  |  |  |  |
Bank of America (BofA) [Member] | Pricing at daily one-month LIBOR plus 1.15%, maturing May 27, 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Facility Size |  |  |  |  |  |  |  |  |  |  |  | $ 250,000,000 |
Current Maturity |  |  |  |  |  |  |  |  |  |  | May 27, 2020 |  |
Line of credit over LIBOR rate |  |  |  |  |  |  |  |  |  |  | 1.15% | 1.15% |
MUFG Union Bank, N.A. (Union Bank) [Member] | Pricing at daily floating rate LIBOR plus 1.20%, maturing June 28, 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Facility Size |  |  |  |  |  |  |  |  |  |  | $ 300,000,000 | $ 350,000,000 | 200,000,000.0
Current Maturity |  |  |  |  |  | Aug. 27, 2020 |  |  | Jul. 28, 2020 |  |  |  |
Line of credit over LIBOR rate |  |  |  |  |  |  |  |  |  |  | 1.50% | 1.50% |
MUFG Union Bank, N.A. (Union Bank) [Member] | Pricing at daily floating rate LIBOR plus 1.20%, maturing June 28, 2020 [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Additional line of credit |  |  |  |  |  |  |  |  |  |  |  |  | $ 150,000,000.0

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- Definition Warehouse receivables and warehouse lines of credit. + References No definition available. + Details
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