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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 ($)		1 Months Ended
	Jul. 01, 2019	Jul. 31, 2019	Feb. 01, 2020	Aug. 01, 2019	Jun. 30, 2019	Apr. 01, 2019	Feb. 27, 2019	Jan. 31, 2019	Dec. 31, 2018
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Maximum Facility Size					$ 2,850,000,000				$ 2,600,000,000
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]
Maximum Facility Size					$ 700,000,000.0	$ 200,000,000.0	$ 200,000,000.0	$ 200,000,000.0	$ 325,000,000.0
Capital One [Member] | Subsequent Event | 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		$ 200,000,000.0
Line of credit over LIBOR rate		1.25%
Current Maturity		Jul. 27, 2020
TD Bank [Member] | Pricing at daily one-month LIBOR plus 1.15%, maturing June 30, 2020 [Member] | Forecast [Member]
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Maximum Facility Size			$ 400,000,000.0
TD Bank [Member] | Subsequent Event | Pricing at daily one-month LIBOR plus 1.15%, maturing June 30, 2020 [Member]
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Maximum Facility Size				$ 800,000,000.0
Line of credit over LIBOR rate	1.15%
Current Maturity	Jun. 30, 2020

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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

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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

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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

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