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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 ($) | 1 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 21, 2018 | Aug. 18, 2018 | Jul. 31, 2018 | Jul. 02, 2018 | Feb. 01, 2018 | Jan. 27, 2018 | Jan. 09, 2018
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum Facility Size |  | $ 2,300,000,000 | $ 3,000,000,000 |  |  |  |  |  |  |
JP Morgan [Member] | Pricing at daily one-month LIBOR plus 1.30%, maturing October 21, 2019 [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum Facility Size | $ 1,010,000,000 |  |  |  |  |  |  |  |  |
Line of credit over LIBOR rate | 1.30% |  |  |  |  |  |  |  |  |
Extended maturity date | Oct. 21, 2019 |  |  |  |  |  |  |  |  |
JP Morgan [Member] | Pricing at daily one-month LIBOR plus 2.75%, maturing October 21, 2019 [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum Facility Size | $ 15,000,000 |  |  |  |  |  |  |  |  |
Extended maturity date | Oct. 21, 2019 |  |  |  |  |  |  |  |  |
TD Bank [Member] | Pricing at daily one-month LIBOR plus 1.20%, maturing June 30, 2019 [Member] |  |  |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum Facility Size |  | $ 400,000,000 | $ 800,000,000 | $ 625,000,000 |  | $ 800,000,000 |  | $ 400,000,000 |  |
Line of credit over LIBOR rate |  | 1.20% | 1.20% |  |  |  |  |  |  |
Bank of America (BofA) [Member] | Pricing at daily one-month LIBOR plus 1.30%, maturing June 4, 2019 [Member] |  |  |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum Facility Size |  | $ 225,000,000 | $ 337,500,000 |  | $ 225,000,000 |  | $ 337,500,000 |  | $ 225,000,000 |
Line of credit over LIBOR rate |  | 1.30% | 1.30% |  |  |  |  |  |  |
Capital One [Member] | Pricing at daily one-month LIBOR plus 1.35%, maturing July 27, 2019 [Member] |  |  |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum Facility Size |  | $ 200,000,000 | $ 387,500,000 | $ 200,000,000 |  | $ 375,000,000 |  |  |  | $ 200,000,000
Line of credit over LIBOR rate |  | 1.35% | 1.35% |  |  |  |  |  |  |

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