All amounts that are due to the servicer of a financial asset as a result of the debt holder not meeting the monthly payment terms.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 50

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122596-111746

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- Definition

Fair value of 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 (b)

-URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122739-111746

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=7516967&loc=d3e66267-113978

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- Definition

Amount of revenue from servicing real estate mortgages, credit cards, and other financial assets held by others. Includes premiums received in lieu of regular servicing fees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 13

-Article 9

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.13 (d))

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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- Definition

Sensitivity analysis of fair value of interests continued to be held by transferor servicing assets or liabilities adverse change in assumptions percent.

+ References

No definition available.

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Servicing of Residential Loans - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Fair Value Measurements Of Financial Instruments [Line Items]
Net servicing revenue and fees	$ 601,510,000us-gaap_ServicingFeesNet	$ 783,389,000us-gaap_ServicingFeesNet	$ 368,509,000us-gaap_ServicingFeesNet
Late Fee Income Generated by Servicing Financial Assets, Amount	48,400,000	39,900,000	16,200,000
Mortgage Loan [Member]
Fair Value Measurements Of Financial Instruments [Line Items]
Fair Value of Servicing Rights	142,500,000	192,100,000
Reverse Loan [Member]
Fair Value Measurements Of Financial Instruments [Line Items]
Fair Value of Servicing Rights	14,100,000	15,900,000
Minimum [Member]
Fair Value Measurements Of Financial Instruments [Line Items]
Adverse Change in assumptions percent	10.00%
Maximum [Member]
Fair Value Measurements Of Financial Instruments [Line Items]
Adverse Change in assumptions percent	20.00%
Customer Concentration Risk [Member] \| Fannie Mae Residential Loans [Member]
Fair Value Measurements Of Financial Instruments [Line Items]
Net servicing revenue and fees	615,800,000	495,300,000
Customer Concentration Risk [Member] \| Fannie Mae Residential Loans and Loans Associated with a Large Commercial Bank [Member]
Fair Value Measurements Of Financial Instruments [Line Items]
Net servicing revenue and fees			$ 199,800,000