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Warehouse Facilities Collateralized by U.S. Government Sponsored Enterprises - Schedule of Company Lines Available and Borrowings Outstanding (Parenthetical) (Detail) - USD ($) $ in Millions | 1 Months Ended | 2 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Aug. 28, 2019 | Sep. 13, 2019 | Jul. 15, 2019 | Mar. 31, 2019 | Jan. 29, 2019 | Jun. 30, 2019 | Dec. 31, 2018
Warehouse Facility Due June 17, 2020 [Member] |  |  |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |  |  |
Maturity date |  |  |  |  |  | Jun. 17, 2020 |
Warehouse Facility Due June 17, 2020 [Member] |  |  |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |  |  |
Maturity date |  |  |  |  |  | Jun. 17, 2020 |
Warehouse Facility Due September 25, 2019 [Member] |  |  |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |  |  |
Maturity date |  |  |  |  |  | Sep. 25, 2019 | Sep. 25, 2019
Warehouse Facility Due October 10, 2019 [Member] |  |  |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |  |  |
Maturity date |  |  |  |  |  | Oct. 10, 2019 | Oct. 10, 2019
Warehouse facility available |  |  |  |  | $ 1,000.0 |  |
Warehouse facility increase (decrease) |  |  |  |  | $ 700.0 |  |
Facility available based on temporary amount |  |  |  | $ 300.0 |  |  |
Temporary facility increase (decrease) amount |  |  |  | $ (400.0) |  |  |
Warehouse Facility Due October 10, 2019 [Member] | Scenario, Forecast [Member] |  |  |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |  |  |
Warehouse facility available | $ 500.0 | $ 1,800.0 |  |  |  |  |
Warehouse facility increase (decrease) | $ 200.0 | $ 1,300.0 |  |  |  |  |
Warehouse Facility Due October 10, 2019 [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |  |  |
Warehouse facility available |  |  | $ 700.0 |  |  |  |
Warehouse facility increase (decrease) |  |  | $ 400.0 |  |  |  |
Warehouse Facility Due June 19, 2019 [Member] |  |  |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |  |  |
Maturity date |  |  |  |  |  |  | Jun. 19, 2019

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- Definition Amount of temporary increase (decrease) of the credit facility. + References No definition available. + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition The maximum amount of borrowing capacity under a line of credit that is available as of the balance sheet date for a specific purpose other than for financing goods acquired for inventory or imminent delivery to a customer. + References No definition available. + Details
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