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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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Oct. 21, 2019 | Aug. 01, 2019 | Jul. 01, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Mar. 01, 2020 | Feb. 06, 2020 | Jun. 28, 2019
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |
Maximum Facility Size |  |  |  | $ 3,400,000,000 | $ 2,600,000,000 |  |  |
JP Morgan [Member] | Pricing at daily one-month LIBOR plus 1.30%, maturing October 21, 2019 [Member] |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |
Current Maturity | Oct. 19, 2020 |  |  | Oct. 19, 2020 |  |  |  |
Maximum Facility Size |  |  |  | $ 985,000,000 | $ 985,000,000 |  |  |
Line of credit over LIBOR rate |  |  |  | 1.30% | 1.30% |  |  |
JP Morgan [Member] | Pricing at daily one-month LIBOR plus 2.75%, maturing October 21, 2019 [Member] |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |
Current Maturity | Oct. 19, 2020 |  |  | Oct. 19, 2020 |  |  |  |
Maximum Facility Size |  |  |  | $ 15,000,000 | $ 15,000,000 |  |  |
Line of credit over LIBOR rate |  |  |  | 2.75% | 2.75% |  |  |
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 |  |  |
Line of credit over LIBOR rate |  |  |  | 1.35% | 1.35% |  |  |
Fannie Mae ASAP Program [Member] | Pricing at daily one-month LIBOR plus 1.35%, with a LIBOR floor of 0.35%, Cancelable anytime [Member] | Forecast [Member] |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |
Maximum Facility Size |  |  |  |  |  | $ 450,000,000.0 |  |
Fannie Mae ASAP Program [Member] | Pricing at daily one-month LIBOR plus 1.35%, with a LIBOR floor of 0.35%, Cancelable anytime [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |
Maximum Facility Size |  |  |  |  |  |  | $ 600,000,000.0 |
TD Bank [Member] | Pricing at daily one-month LIBOR plus 1.15%, maturing June 30, 2020 [Member] |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |
Current Maturity |  | Feb. 01, 2020 | Jun. 30, 2020 |  |  |  |  |
Maximum Facility Size |  | $ 800,000,000.0 |  |  |  |  |  |
Line of credit over LIBOR rate |  |  | 1.15% |  |  |  |  |
MUFG Union Bank, N.A. (Union Bank) [Member] | Pricing at daily one-month LIBOR plus 1.20%, maturing June 28, 2020 [Member] |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |
Current Maturity |  |  |  | Jun. 28, 2020 |  |  |  |
Maximum Facility Size |  |  |  | $ 350,000,000 |  |  |  | $ 200,000,000.0
Line of credit over LIBOR rate |  |  |  | 1.20% | 1.20% |  |  |
MUFG Union Bank, N.A. (Union Bank) [Member] | Pricing at daily one-month LIBOR plus 1.20%, maturing June 28, 2020 [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |
Additional line of credit |  |  |  |  |  |  |  | $ 150,000,000.0

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- Definition Warehouse receivables and warehouse lines of credit. + References No definition available. + Details
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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + 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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- 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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