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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 ($)	Jul. 31, 2018	Oct. 01, 2018	Aug. 18, 2018	Jul. 02, 2018	Jun. 30, 2018	Feb. 01, 2018	Jan. 27, 2018	Jan. 09, 2018	Dec. 31, 2017
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Maximum Facility Size					$ 2,300,000,000				$ 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
TD Bank [Member] | Subsequent Event [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	$ 800,000,000
Bank of America (BofA) [Member] | Pricing at daily one-month LIBOR plus 1.40%, maturing September 4, 2018 [Member]
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Maximum Facility Size					225,000,000		$ 225,000,000		337,500,000
Bank of America (BofA) [Member] | Pricing at daily one-month LIBOR plus 1.40%, maturing September 4, 2018 [Member] | Scenario Forecast [Member]
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Maximum Facility Size			$ 225,000,000
Bank of America (BofA) [Member] | Subsequent Event [Member] | Pricing at daily one-month LIBOR plus 1.40%, maturing September 4, 2018 [Member]
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Maximum Facility Size				$ 337,500,000
Capital One [Member] | Pricing at daily one-month LIBOR plus 1.40%, maturing July 27, 2018 [Member]
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Maximum Facility Size					$ 200,000,000			$ 200,000,000	$ 387,500,000
Capital One [Member] | Pricing at daily one-month LIBOR plus 1.40%, maturing July 27, 2018 [Member] | Scenario Forecast [Member]
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Maximum Facility Size		$ 200,000,000
Capital One [Member] | Subsequent Event [Member] | Pricing at daily one-month LIBOR plus 1.40%, maturing July 27, 2018 [Member]
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Maximum Facility Size	$ 375,000,000
Extended maturity period	1 year

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- Definition

Warehouse receivables and warehouse lines of credit.

+ References

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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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