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Mortgage Servicing Rights - Details of Retention and Purchase of MSRs (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Mortgage Servicing Rights [Line Items] |  |  |  |
MSRs recognized |  |  | $ 52,297 | $ 30,962
Mortgage servicing rights |  |  |  |
Mortgage Servicing Rights [Line Items] |  |  |  |
MSRs recognized | $ 22,760 | $ 61,606 | 73,976 | $ 76,272
Associated Principal | 2,134,271 |  | 7,041,235 |
Mortgage servicing rights | Jumbo MSR Additions |  |  |  |
Mortgage Servicing Rights [Line Items] |  |  |  |
MSRs recognized | 237 |  | 8,375 |
Associated Principal | 21,775 |  | 883,296 |
Mortgage servicing rights | Jumbo MSR Additions | Securitization |  |  |  |
Mortgage Servicing Rights [Line Items] |  |  |  |
MSRs recognized | 0 |  | 7,874 |
Associated Principal | 0 |  | 835,254 |
Mortgage servicing rights | Jumbo MSR Additions | Loan Sales |  |  |  |
Mortgage Servicing Rights [Line Items] |  |  |  |
MSRs recognized | 237 |  | 501 |
Associated Principal | 21,775 |  | 48,042 |
Mortgage servicing rights | Conforming MSR Additions |  |  |  |
Mortgage Servicing Rights [Line Items] |  |  |  |
MSRs recognized | 22,523 |  | 65,601 |
Associated Principal | 2,112,496 |  | 6,157,939 |
Mortgage servicing rights | Conforming MSR Additions | Loan Sales |  |  |  |
Mortgage Servicing Rights [Line Items] |  |  |  |
MSRs recognized | 15,201 |  | 43,901 |
Associated Principal | 1,384,126 |  | 4,085,655 |
Mortgage servicing rights | Conforming MSR Additions | From purchases |  |  |  |
Mortgage Servicing Rights [Line Items] |  |  |  |
MSRs recognized | 7,322 |  | 21,700 |
Associated Principal | $ 728,370 |  | $ 2,072,284 |

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- Definition Mortgage Servicing Rights [Line Items] + References No definition available. + Details
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- Definition Amount of additions from purchases, assumption or transfer to contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=56950315&loc=d3e122739-111746 + Details
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- Definition The value of new servicing assets, subsequently measured at fair value, acquired or created during the current period through purchases or from transfers of financial assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=56950315&loc=d3e122625-111746 + Details
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