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Warehouse Notes Payable - Schedule of Company Lines Available and Borrowings Outstanding (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Securities Financing Transaction [Line Items] |  |  |
Warehouse notes payable | $ 950,479 |  | $ 360,440
Committed Lines [Member] |  |  |
Securities Financing Transaction [Line Items] |  |  |
Lines available | 1,050,000 |  | 950,000
Uncommitted Lines [Member] |  |  |
Securities Financing Transaction [Line Items] |  |  |
Lines available | 325,000 |  | 325,000
Warehouse Line Due June 20, 2018 [Member] |  |  |
Securities Financing Transaction [Line Items] |  |  |
Warehouse notes payable | $ 390,295 |  | $ 60,715
Warehouse Line Due June 20, 2018 [Member] | One Month LIBOR [Member] |  |  |
Securities Financing Transaction [Line Items] |  |  |
Stated Spread to One Month LIBOR | 1.30% |  | 1.30%
Warehouse Line Due June 20, 2018 [Member] | Committed Lines [Member] |  |  |
Securities Financing Transaction [Line Items] |  |  |
Lines available | $ 450,000 |  | $ 450,000
Warehouse Line Due September 25, 2018 [Member] |  |  |
Securities Financing Transaction [Line Items] |  |  |
Warehouse notes payable | $ 166,480 |  | $ 107,383
Warehouse Line Due September 25, 2018 [Member] | One Month LIBOR [Member] |  |  |
Securities Financing Transaction [Line Items] |  |  |
Stated Spread to One Month LIBOR | 1.30% |  | 1.30%
Warehouse Line Due September 25, 2018 [Member] | Committed Lines [Member] |  |  |
Securities Financing Transaction [Line Items] |  |  |
Lines available | $ 200,000 |  | $ 200,000
Warehouse Line Due October 11, 2018 [Member] |  |  |
Securities Financing Transaction [Line Items] |  |  |
Warehouse notes payable | $ 361,739 | [1] | $ 174,102
Warehouse Line Due October 11, 2018 [Member] | One Month LIBOR [Member] |  |  |
Securities Financing Transaction [Line Items] |  |  |
Stated Spread to One Month LIBOR | 1.30% | [1] | 1.30%
Warehouse Line Due October 11, 2018 [Member] | Committed Lines [Member] |  |  |
Securities Financing Transaction [Line Items] |  |  |
Lines available | $ 400,000 | [1] | $ 300,000
Fannie Mae Repurchase Agreement, Open Maturity [Member] |  |  |
Securities Financing Transaction [Line Items] |  |  |
Warehouse notes payable | $ 31,965 |  | $ 18,240
Fannie Mae Repurchase Agreement, Open Maturity [Member] | One Month LIBOR [Member] |  |  |
Securities Financing Transaction [Line Items] |  |  |
Stated Spread to One Month LIBOR | 1.20% |  | 1.20%
Fannie Mae Repurchase Agreement, Open Maturity [Member] | Uncommitted Lines [Member] |  |  |
Securities Financing Transaction [Line Items] |  |  |
Lines available | $ 325,000 |  | $ 325,000
[1] | The warehouse line was temporarily increased by $300.0 million to $400.0 million for the period of March 29, 2018 to May 12, 2018

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- Definition Carrying value as of the balance sheet date of the outstanding short-term borrowings under a revolving line of credit used by mortgage bankers to finance the origination or purchase of loans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(13)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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