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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 ($) | 12 Months Ended |  |  |  |  |
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Dec. 31, 2018 | Feb. 01, 2018 | Jan. 27, 2018 | Jan. 09, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |
Maximum Facility Size | $ 2,600,000,000 |  |  |  | $ 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 | $ 400,000,000
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 | 425,000,000 |  | $ 225,000,000 |  | 337,500,000 | 225,000,000
Additional line of credit borrowing capacity added during period | 200,000,000 |  |  |  |  |
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 | $ 325,000,000 |  |  | $ 200,000,000 | $ 387,500,000 | $ 200,000,000

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- Definition Line of credit facility increase in maximum borrowing capacity. + References No definition available. + Details
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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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- Details
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- Details
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