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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 ($) | Jul. 31, 2018 | Oct. 01, 2018 | Aug. 18, 2018 | Jul. 02, 2018 | Jun. 30, 2018 | Feb. 01, 2018 | Jan. 27, 2018 | Jan. 09, 2018 | Dec. 31, 2017
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Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |  |
Maximum Facility Size |  |  |  |  | $ 2,300,000,000 |  |  |  | $ 3,000,000,000
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 | $ 400,000,000 |  |  | 800,000,000
TD Bank [Member] | Subsequent Event [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 | $ 800,000,000 |  |  |  |  |  |  |  |
Bank of America (BofA) [Member] | Pricing at daily one-month LIBOR plus 1.40%, maturing September 4, 2018 [Member] |  |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |  |
Maximum Facility Size |  |  |  |  | 225,000,000 |  | $ 225,000,000 |  | 337,500,000
Bank of America (BofA) [Member] | Pricing at daily one-month LIBOR plus 1.40%, maturing September 4, 2018 [Member] | Scenario Forecast [Member] |  |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |  |
Maximum Facility Size |  |  | $ 225,000,000 |  |  |  |  |  |
Bank of America (BofA) [Member] | Subsequent Event [Member] | Pricing at daily one-month LIBOR plus 1.40%, maturing September 4, 2018 [Member] |  |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |  |
Maximum Facility Size |  |  |  | $ 337,500,000 |  |  |  |  |
Capital One [Member] | Pricing at daily one-month LIBOR plus 1.40%, maturing July 27, 2018 [Member] |  |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |  |
Maximum Facility Size |  |  |  |  | $ 200,000,000 |  |  | $ 200,000,000 | $ 387,500,000
Capital One [Member] | Pricing at daily one-month LIBOR plus 1.40%, maturing July 27, 2018 [Member] | Scenario Forecast [Member] |  |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |  |
Maximum Facility Size |  | $ 200,000,000 |  |  |  |  |  |  |
Capital One [Member] | Subsequent Event [Member] | Pricing at daily one-month LIBOR plus 1.40%, maturing July 27, 2018 [Member] |  |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |  |
Maximum Facility Size | $ 375,000,000 |  |  |  |  |  |  |  |
Extended maturity period | 1 year |  |  |  |  |  |  |  |

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