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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 ($) |  |  |  |  |  | 6 Months Ended | 12 Months Ended |
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Jul. 28, 2020 | Jul. 24, 2020 | Jul. 01, 2020 | Jun. 26, 2020 | Jun. 10, 2020 | Jun. 30, 2020 | Dec. 31, 2019 | Jun. 28, 2019
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |
Maximum Facility Size |  |  |  |  |  | $ 2,750,000,000 | $ 3,400,000,000 |
Capital One [Member] | Pricing at daily one-month LIBOR plus 1.25%, maturing July 27, 2020 [Member] |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |
Current Maturity |  |  |  |  |  | Jul. 27, 2020 |  |
Maximum Facility Size |  |  |  |  |  | $ 200,000,000 | $ 200,000,000 |
Line of credit over LIBOR rate |  |  |  |  |  | 1.25% | 1.25% |
TD Bank [Member] | Pricing at daily floating rate LIBOR plus 1.15%, maturing June 30, 2021 [Member] |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |
Current Maturity |  |  |  |  |  | Jun. 30, 2021 |  |
Maximum Facility Size |  |  |  |  |  | $ 400,000,000 | $ 800,000,000 |
Line of credit over LIBOR rate |  |  |  |  |  | 1.15% | 1.15% |
TD Bank [Member] | Pricing at daily floating rate LIBOR plus 1.15%, maturing June 30, 2021 [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |
Current Maturity |  |  | Jun. 30, 2021 |  |  |  |  |
Maximum Facility Size |  |  | $ 400,000,000.0 |  |  |  |  |
Bank of America (BofA) [Member] | LIBOR daily floating rate plus 1.50% on general facility and LIBOR daily floating rate plus 1.75% on separate sublimit borrowing, maturing on May 26, 2021 [Member] |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |
Current Maturity |  |  |  |  | May 26, 2021 | May 26, 2021 |  |
Maximum Facility Size |  |  |  |  | $ 350,000,000.0 | $ 350,000,000 | $ 350,000,000 |
Bank of America (BofA) [Member] | LIBOR daily floating rate plus 1.50% on general facility and LIBOR daily floating rate plus 1.75% on separate sublimit borrowing, maturing on May 26, 2021 [Member] | Sublimit Borrowing [Member] |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |
Maximum Facility Size |  |  |  |  | $ 100,000,000.0 |  |  |
Line of credit over LIBOR rate |  |  |  |  | 1.75% |  |  |
Bank of America (BofA) [Member] | LIBOR daily floating rate plus 1.50% on general facility and LIBOR daily floating rate plus 1.75% on separate sublimit borrowing, maturing on May 26, 2021 [Member] | General Facility [Member] |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |
Line of credit over LIBOR rate |  |  |  |  | 1.50% |  |  |
Bank of America (BofA) [Member] | LIBOR daily floating rate plus 1.50% on general facility and LIBOR daily floating rate plus 1.75% on separate sublimit borrowing, maturing on May 26, 2021 [Member] | Subsequent Event [Member] | General Facility [Member] |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |
Line of credit over LIBOR rate |  | 1.40% |  |  |  |  |  |
Bank of America (BofA) [Member] | Pricing at daily one-month LIBOR plus 1.15%, maturing May 27, 2020 [Member] |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |
Current Maturity |  |  |  |  |  | May 27, 2020 |  |
Maximum Facility Size |  |  |  |  |  |  | $ 250,000,000 |
Line of credit over LIBOR rate |  |  |  |  |  | 1.15% | 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 |  |  |  | Jul. 28, 2020 |  | Jul. 28, 2020 |  |
Maximum Facility Size |  |  |  |  |  | $ 350,000,000 | $ 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
MUFG Union Bank, N.A. (Union Bank) [Member] | Pricing at daily one-month LIBOR plus 1.20%, maturing June 28, 2020 [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |
Current Maturity | Aug. 27, 2020 |  |  |  |  |  |  |

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