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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 ($)											9 Months Ended	12 Months Ended
	Jan. 18, 2021	Oct. 19, 2020	Sep. 22, 2020	Sep. 21, 2020	Aug. 04, 2020	Jul. 28, 2020	Jul. 24, 2020	Jul. 01, 2020	Jun. 26, 2020	Jun. 10, 2020	Sep. 30, 2020	Dec. 31, 2019	Jun. 28, 2019
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Maximum Facility Size			$ 100,000,000.0		$ 100,000,000.0						$ 2,900,000,000	$ 3,400,000,000
Current Maturity			Jan. 20, 2021		Jun. 28, 2021
Line of credit over LIBOR rate					1.50%
Maximum [Member]
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Additional line of credit													$ 150,000,000.0
JP Morgan [Member] | Pricing at daily floating rate LIBOR plus 1.30%, maturing October 19, 2020 [Member]
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Maximum Facility Size											$ 985,000,000	$ 985,000,000
Current Maturity											Oct. 19, 2020
Line of credit over LIBOR rate											1.30%	1.30%
JP Morgan [Member] | Pricing at daily floating rate LIBOR plus 1.30%, maturing October 19, 2020 [Member] | Subsequent Event [Member]
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Maximum Facility Size		$ 1,585,000,000.0
JP Morgan [Member] | Pricing at daily floating rate LIBOR plus 1.30%, maturing October 19, 2020 [Member] | Forecast [Member]
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Maximum Facility Size	$ 985,000,000.0
Current Maturity	Oct. 18, 2021
Line of credit over LIBOR rate	1.60%
JP Morgan [Member] | Pricing at daily floating rate LIBOR plus 2.75%, maturing October 19, 2020 [Member]
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Maximum Facility Size											$ 15,000,000	$ 15,000,000
Current Maturity											Oct. 19, 2020
Line of credit over LIBOR rate											2.75%	2.75%
JP Morgan [Member] | Pricing at daily floating rate LIBOR plus 2.75%, maturing October 19, 2020 [Member] | Subsequent Event [Member]
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Current Maturity		Oct. 18, 2021
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]
Maximum Facility Size												$ 200,000,000
Current Maturity											Jul. 27, 2020
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]
Maximum Facility Size								$ 400,000,000.0			$ 800,000,000	$ 800,000,000
Current Maturity				Dec. 31, 2020				Jun. 30, 2021
Line of credit over LIBOR rate											1.15%	1.15%
Additional line of credit				$ 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]
Maximum Facility Size										$ 350,000,000.0	$ 350,000,000	$ 350,000,000
Current Maturity										May 26, 2021	May 26, 2021
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							1.40%
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]
Maximum Facility Size												$ 250,000,000
Current Maturity											May 27, 2020
Line of credit over LIBOR rate											1.15%	1.15%
MUFG Union Bank, N.A. (Union Bank) [Member] | Pricing at daily floating rate LIBOR plus 1.20%, maturing June 28, 2020 [Member]
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Maximum Facility Size											$ 300,000,000	$ 350,000,000	200,000,000.0
Current Maturity						Aug. 27, 2020			Jul. 28, 2020
Line of credit over LIBOR rate											1.50%	1.50%
MUFG Union Bank, N.A. (Union Bank) [Member] | Pricing at daily floating rate 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

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+ References

No definition available.

+ Details

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- Definition

Warehouse receivables and warehouse lines of credit.

+ References

No definition available.

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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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=120391452&loc=d3e13212-122682

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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=120391452&loc=d3e13212-122682

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