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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 ($)	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				$ 3,000,000,000	$ 3,400,000,000
Bank of America (BofA) [Member] | Pricing at daily one-month LIBOR plus 1.40%, maturing June 5, 2018 [Member]
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Maximum Facility Size				337,500,000	200,000,000
Bank of America (BofA) [Member] | Subsequent Event [Member] | Pricing at daily one-month LIBOR plus 1.40%, maturing June 5, 2018 [Member]
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Maximum Facility Size		$ 200,000,000
TD Bank [Member] | Pricing at daily one-month LIBOR plus 1.25%, maturing June 30, 2018 [Member]
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Maximum Facility Size				800,000,000	400,000,000
TD Bank [Member] | Subsequent Event [Member] | Pricing at daily one-month LIBOR plus 1.25%, maturing June 30, 2018 [Member]
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Maximum Facility Size	$ 400,000,000
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				$ 387,500,000	$ 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			$ 200,000,000

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- Definition

Warehouse receivables and warehouse lines of credit.

+ References

No definition available.

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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://www.xbrl.org/2003/role/presentationRef
-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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