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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
	Dec. 31, 2018	Feb. 01, 2018	Jan. 27, 2018	Jan. 09, 2018	Dec. 31, 2017	Dec. 31, 2016
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Maximum Facility Size	$ 2,600,000,000				$ 3,000,000,000
TD Bank [Member] | Pricing at daily one-month LIBOR plus 1.20%, maturing June 30, 2019 [Member]
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Maximum Facility Size	400,000,000	$ 400,000,000			800,000,000	$ 400,000,000
Bank of America (BofA) [Member] | Pricing at daily one-month LIBOR plus 1.30%, maturing June 4, 2019 [Member]
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Maximum Facility Size	425,000,000		$ 225,000,000		337,500,000	225,000,000
Additional line of credit borrowing capacity added during period	200,000,000
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	$ 325,000,000			$ 200,000,000	$ 387,500,000	$ 200,000,000

X

- Definition

Line of credit facility increase in maximum borrowing capacity.

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	duration

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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

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- Details

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