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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 ($) | Feb. 01, 2018 | Jan. 27, 2018 | Jan. 09, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |
Maximum Facility Size |  |  |  | $ 3,000,000,000 | $ 3,400,000,000
Bank of America (BofA) [Member] | Pricing at daily one-month LIBOR plus 1.40%, maturing June 5, 2018 [Member] |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |
Maximum Facility Size |  |  |  | 337,500,000 | 200,000,000
Bank of America (BofA) [Member] | Subsequent Event [Member] | Pricing at daily one-month LIBOR plus 1.40%, maturing June 5, 2018 [Member] |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |
Maximum Facility Size |  | $ 200,000,000 |  |  |
TD Bank [Member] | Pricing at daily one-month LIBOR plus 1.25%, maturing June 30, 2018 [Member] |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |
Maximum Facility Size |  |  |  | 800,000,000 | 400,000,000
TD Bank [Member] | Subsequent Event [Member] | Pricing at daily one-month LIBOR plus 1.25%, maturing June 30, 2018 [Member] |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |
Maximum Facility Size | $ 400,000,000 |  |  |  |
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 |  |  |  | $ 387,500,000 | $ 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 |  |  | $ 200,000,000 |  |

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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://www.xbrl.org/2003/role/presentationRef -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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