Servicing of Residential Loans - Schedule of Fair Value Assumptions, Servicing Rights Carried at Amortized Cost (Detail) - Servicing Rights Carried at Amortized Cost [Member]	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
Mortgage Loans [Member]
Servicing Asset at Amortized Cost [Line Items]
Weighted-average remaining life in years	5 years 1 month 6 days	5 years 7 months 6 days
Weighted-average discount rate	13.00%	12.06%
Conditional prepayment rate	6.51%	6.49%
Conditional default rate	2.33%	2.16%
Reverse Loan Class [Member]
Servicing Asset at Amortized Cost [Line Items]
Weighted-average remaining life in years	2 years 7 months 6 days	2 years 9 months 18 days
Weighted-average discount rate	15.00%	15.00%
Conditional repayment rate	32.28%	29.53%

Weighted average life of securitized assets regardless of when the transfer occurred, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=64830801&loc=d3e107314-111719

+ Details

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- Definition

Discount rate which is used to value residual cash flows generated by financial assets of a securitization, asset-backed financing arrangement, or similar transfer regardless of when the transfer occurred.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=64830801&loc=d3e107314-111719

+ Details

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Period Type:	duration

- Definition

Estimated rate of prepayment of principal on financial assets regardless of when the transfer occurred.

+ References

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- Definition

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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- Definition

Percentage of likelihood a loan will not be repaid and instead default, used as an input to measure fair value.

+ References

No definition available.

+ Details

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- Definition

Assumption for fair value of interests continued to be held by transferor servicing assets or liabilities conditional repayment rate.

+ References

No definition available.

+ Details

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