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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	9 Months Ended	12 Months Ended
	Oct. 31, 2018	Sep. 30, 2018	Dec. 31, 2017	Sep. 21, 2018	Aug. 18, 2018	Jul. 31, 2018	Jul. 02, 2018	Feb. 01, 2018	Jan. 27, 2018	Jan. 09, 2018
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Maximum Facility Size		$ 2,300,000,000	$ 3,000,000,000
JP Morgan [Member] | Pricing at daily one-month LIBOR plus 1.30%, maturing October 21, 2019 [Member] | Subsequent Event [Member]
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Maximum Facility Size	$ 1,010,000,000
Line of credit over LIBOR rate	1.30%
Extended maturity date	Oct. 21, 2019
JP Morgan [Member] | Pricing at daily one-month LIBOR plus 2.75%, maturing October 21, 2019 [Member] | Subsequent Event [Member]
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Maximum Facility Size	$ 15,000,000
Extended maturity date	Oct. 21, 2019
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	$ 800,000,000	$ 625,000,000		$ 800,000,000		$ 400,000,000
Line of credit over LIBOR rate		1.20%	1.20%
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		$ 225,000,000	$ 337,500,000		$ 225,000,000		$ 337,500,000		$ 225,000,000
Line of credit over LIBOR rate		1.30%	1.30%
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		$ 200,000,000	$ 387,500,000	$ 200,000,000		$ 375,000,000				$ 200,000,000
Line of credit over LIBOR rate		1.35%	1.35%

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- Definition

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+ 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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