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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 ($)	Apr. 01, 2019	Mar. 31, 2019	Feb. 27, 2019	Feb. 04, 2019	Jan. 31, 2019	Jan. 02, 2019	Dec. 31, 2018
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Maximum Facility Size		$ 2,975,000,000					$ 2,600,000,000
Capital One [Member] | Pricing at daily one-month LIBOR plus 1.35%, maturing July 27, 2019 [Member]
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Maximum Facility Size		700,000,000	$ 200,000,000		$ 200,000,000		325,000,000
Capital One [Member] | Subsequent Event [Member] | Pricing at daily one-month LIBOR plus 1.35%, maturing July 27, 2019 [Member]
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Maximum Facility Size	$ 200,000,000
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		$ 575,000,000	$ 450,000,000

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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://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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