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Warehouse Receivables & Warehouse Lines of Credit - Summary of Warehouse Lines of Credit in Place (Detail) - USD ($) | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | Feb. 01, 2018 | Jan. 27, 2018 | Jan. 09, 2018
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |
Carrying Value | $ 1,148,005,000 | $ 910,766,000 |  |  |
Warehouse Agreement Borrowings [Member] |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |
Maximum Facility Size | 2,300,000,000 | 3,000,000,000 |  |  |
Carrying Value | $ 1,148,005,000 | 910,766,000 |  |  |
Warehouse Agreement Borrowings [Member] | JP Morgan [Member] | Pricing at daily one-month LIBOR plus 1.45%, maturing October 23, 2018 [Member] |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |
Current Maturity | Oct. 23, 2018 |  |  |  |
Maximum Facility Size | $ 1,000,000,000 | 1,000,000,000 |  |  |
Carrying Value | $ 815,266,000 | $ 192,180,000 |  |  |
Line of credit over LIBOR rate | 1.45% | 1.45% |  |  |
Warehouse Agreement Borrowings [Member] | JP Morgan [Member] | Pricing at daily one-month LIBOR plus 2.75%, maturing October 23, 2018 [Member] |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |
Current Maturity |  | Oct. 23, 2018 |  |  |
Maximum Facility Size | $ 25,000,000 | $ 25,000,000 |  |  |
Carrying Value | $ 2,578,000 | $ 5,800,000 |  |  |
Line of credit over LIBOR rate | 2.75% | 2.75% |  |  |
Warehouse Agreement Borrowings [Member] | 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] |  |  |  |  |
Current Maturity | Jun. 05, 2018 |  |  |  |
Maximum Facility Size | $ 225,000,000 | $ 337,500,000 |  | $ 225,000,000 |
Carrying Value | $ 99,223,000 | $ 130,443,000 |  |  |
Line of credit over LIBOR rate | 1.40% | 1.40% |  |  |
Warehouse Agreement Borrowings [Member] | Fannie Mae ASAP Program [Member] | Pricing at daily one-month LIBOR plus 1.35%, with a LIBOR floor of 0.35%, Cancelable anytime [Member] |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |
Current Maturity | Cancelable anytime |  |  |  |
Maximum Facility Size | $ 450,000,000 | $ 450,000,000 |  |  |
Carrying Value | $ 14,584,000 | $ 205,827,000 |  |  |
Line of credit over LIBOR rate | 1.35% | 1.35% |  |  |
Line of credit, LIBOR floor rate | 0.35% | 0.35% |  |  |
Warehouse Agreement Borrowings [Member] | 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] |  |  |  |  |
Current Maturity | Jun. 30, 2018 |  |  |  |
Maximum Facility Size | $ 400,000,000 | $ 800,000,000 | $ 400,000,000 |  |
Carrying Value | $ 92,672,000 | $ 225,416,000 |  |  |
Line of credit over LIBOR rate | 1.25% | 1.25% |  |  |
Warehouse Agreement Borrowings [Member] | 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] |  |  |  |  |
Current Maturity | Jul. 27, 2018 |  |  |  |
Maximum Facility Size | $ 200,000,000 | $ 387,500,000 |  |  | $ 200,000,000
Carrying Value | $ 123,682,000 | $ 151,100,000 |  |  |
Line of credit over LIBOR rate | 1.40% | 1.40% |  |  |

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Balance Type: | na
Period Type: | duration

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- Definition This element represents the minimum amount for the debt instrument's basis spread over the variable interest rate on a debt instrument. + References No definition available. + Details
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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + 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 + Details
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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 + Details
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Balance Type: | credit
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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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