Transfers of Residential Loans - Schedule of Continuing Involvement with Mortgage Loans Sold with Servicing Rights Retained (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Carrying Value of Net Assets Recorded on the Consolidated Balance Sheets	$ 439,830	$ 458,904
Unpaid Principal Balance of Sold Loans	37,442,262	36,116,570
Servicing Rights, Net
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Carrying Value of Net Assets Recorded on the Consolidated Balance Sheets	424,040	439,062
Servicer And Protective Advances, Net
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Carrying Value of Net Assets Recorded on the Consolidated Balance Sheets	17,104	21,825
Payables and Accrued Liabilities
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Carrying Value of Net Assets Recorded on the Consolidated Balance Sheets	$ (1,314)	$ (1,983)

Principal amount of transferred financial assets in which the transferor has continuing involvement with the assets underlying the transaction. Continuing involvement includes, but is not limited to, servicing, recourse, and restrictions on transferor's interests in transferred financial assets.

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

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+ References

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Amount of transferred financial assets in which the transferor has continuing involvement with the assets underlying the transaction that continue to be recognized in the statement of financial position. Includes, but is not limited to, servicing, recourse, and restrictions on transferor's interests in transferred financial assets.

+ 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 (a)(3)
-URI http://asc.fasb.org/extlink&oid=64830801&loc=d3e107314-111719

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- Definition

Amount of liabilities related to transferred financial assets in which the transferor has continuing involvement with the assets underlying the transaction that continue to be recognized in the statement of financial position. Includes, but is not limited to, servicing, recourse, and restrictions on transferor's interests in transferred financial assets.

+ References

No definition available.

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