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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 ($) | Apr. 01, 2019 | Mar. 31, 2019 | Feb. 27, 2019 | Feb. 04, 2019 | Jan. 31, 2019 | Jan. 02, 2019 | Dec. 31, 2018
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Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |
Maximum Facility Size |  | $ 2,975,000,000 |  |  |  |  | $ 2,600,000,000
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 |  | 700,000,000 | $ 200,000,000 |  | $ 200,000,000 |  | 325,000,000
Capital One [Member] | Subsequent Event [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 |  |  |  |  |  |
Fannie Mae ASAP Program [Member] | Pricing at daily one-month LIBOR plus 1.35%, with a LIBOR floor of 0.35%, Cancelable anytime [Member] |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |
Maximum Facility Size |  | $ 450,000,000 |  | $ 450,000,000 |  | $ 575,000,000 | $ 450,000,000

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- Definition Warehouse receivables and warehouse lines of credit. + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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