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Residential Loans - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 Contract | Sep. 30, 2013 | Dec. 31, 2013 Contract
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Carrying value | $ 3,287,587,000 |  | $ 3,287,587,000 |  | $ 2,166,434,000
Residential Loans Held for Investment |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Carrying value | 1,546,507,000 |  | 1,546,507,000 |  | 1,762,167,000
Principal value | 1,554,876,000 |  | 1,554,876,000 |  | 1,770,803,000
Unamortized premium, net | 13,540,000 |  | 13,540,000 |  | 16,791,000
Weighted average original loan-to-value (LTV) | 66.00% |  | 66.00% |  |
Weighted average original Fair Isaac Corporation (FICO) score | 733 |  | 733 |  |
Charge-offs, net | 1,000,000 | 1,000,000 | 3,000,000 | 3,000,000 |
Principal value | 6,000,000 | 3,000,000 | 14,000,000 | 10,000,000 |
Residential Loans Held for Investment | Residential Loans Acquired Prior To July 1st 2004 |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Principal value | 629,000,000 |  | 629,000,000 |  | 731,000,000
Unamortized premium, net | 8,000,000 |  | 8,000,000 |  | 11,000,000
Percentage of loans prepaid |  |  | 14.00% |  |
Percentage of premiums amortized |  |  | 23.00% |  |
Residential Loans Held for Investment | Residential Loans Acquired After July 1st 2004 |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Principal value | 929,000,000 |  | 929,000,000 |  | 1,000,000,000
Unamortized premium, net | 5,000,000 |  | 5,000,000 |  | 6,000,000
Percentage of loans prepaid |  |  | 11.00% |  |
Percentage of premiums amortized |  |  | 13.00% |  |
Residential Loans Held for Investment | First Mortgage |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Percentage of loan portfolio | 99.00% |  | 99.00% |  |
Residential Loans Held for Investment | Second Mortgage |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Percentage of loan portfolio | 1.00% |  | 1.00% |  |
Residential Loans |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Charge-offs, net | 1,355,000 | 818,000 | 2,833,000 | 3,363,000 |
Loss confirmation period |  |  | 23 months |  |
Average recorded investment of loans individually evaluated for impairment | 15,000,000 | 8,000,000 | 12,000,000 | 7,000,000 |
Interest income recognized on impaired loans | 32,000 | 81,000 | 99,000 | 102,000 |
Residential Loans at Fair Value |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Carrying value | 1,500,000,000 |  | 1,500,000,000 |  | 403,000,000
Number of loans |  |  | 2,862 |  | 537
Principal value | 1,460,000,000 |  | 1,460,000,000 |  | 399,000,000
Principal value | 3,310,000,000 |  | 6,120,000,000 |  |
Positive Valuation adjustments | 13,446,000 | (10,804,000) | 34,554,000 | (17,339,000) |
Residential Loans at Lower of Cost or Fair Value |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Carrying value | 1,502,000 |  | 1,502,000 |  | 1,665,000
Number of loans |  |  | 9 |  | 10
Principal value | 2,000,000 |  | 2,000,000 |  | 2,000,000
Valuation adjustments | 43,000 |  | 54,000 |  |
Residential Loans Held For Investment at Fair Value |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Carrying value | 238,651,000 |  | 238,651,000 |  |
Principal balance of loans transferred | 235,000,000 |  |  |  |
Fair value of loans transferred | 241,000,000 |  |  |  |
Residential Loans Held For Sale |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Carrying value | 1,502,429,000 |  | 1,502,429,000 |  | 404,267,000
Residential Loans Held For Sale | Mortgage Servicing Rights |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Carrying value | $ 1,610,000,000 |  | $ 1,610,000,000 |  |

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- Definition Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss. + 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 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph d -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
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- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5258-111524 + Details
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- Definition Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of consumer loans, including, but not limited to, mortgage, home equity, vehicles, credit card, installment, and lease financing. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5066-111524 + Details
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- Definition The total periodic movement (increases and decreases) in the carrying amount of mortgage loans on real estate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 29 -Article 12 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule IV -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29.6) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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- Definition Amount of deferred fees paid by borrowers and unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of loans that are being amortized into income as an adjustment to yield. Excludes amounts for loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6378536&loc=d3e10092-111533 + Details
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