For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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- Definition

The total amount of contractually specified servicing fees, late fees, and ancillary fees earned for each period for which results of operations are presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-SubTopic 50
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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
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-Paragraph 4
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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Servicing of Residential Loans - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Servicing Asset at Amortized Cost [Line Items]
Servicing revenue and fees	$ 848,254	$ 930,827	$ 920,913
Mortgage Loan Class [Member]
Servicing Asset at Amortized Cost [Line Items]
Fair value of servicing rights	79,900	117,300
Reverse Loan Class [Member]
Servicing Asset at Amortized Cost [Line Items]
Fair value of servicing rights	7,300	11,100
Customer Concentration Risk [Member] \| Fannie Mae [Member]
Servicing Asset at Amortized Cost [Line Items]
Servicing revenue and fees	458,900	$ 571,400	$ 615,800
Customer Concentration Risk [Member] \| Freddie Mac [Member]
Servicing Asset at Amortized Cost [Line Items]
Servicing revenue and fees	92,800
Customer Concentration Risk [Member] \| Ginnie Mae [Member]
Servicing Asset at Amortized Cost [Line Items]
Servicing revenue and fees	$ 85,200
Subservicing Concentration [Member] \| Customer One [Member]
Servicing Asset at Amortized Cost [Line Items]
Percentage of Total	56.00%
Subservicing Concentration [Member] \| Customer Two [Member]
Servicing Asset at Amortized Cost [Line Items]
Percentage of Total	23.00%