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- Details of Retention and Purchase of MSRs (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Mortgage Servicing Rights [Line Items]
MSR Fair Value	$ 64,725	$ 48,000	$ 44,063
Mortgage Servicing Rights
Mortgage Servicing Rights [Line Items]
MSR Fair Value	95,281	95,550	$ 47,514
Associated Principal	9,119,764	8,672,671
Mortgage Servicing Rights | Jumbo Loan
Mortgage Servicing Rights [Line Items]
MSR Fair Value	8,554	9,006
Associated Principal	915,882	1,061,028
Mortgage Servicing Rights | Conforming Loan
Mortgage Servicing Rights [Line Items]
MSR Fair Value	86,727	86,544
Associated Principal	8,203,882	7,611,643
Mortgage Servicing Rights | Securitizations | Jumbo Loan
Mortgage Servicing Rights [Line Items]
MSR Fair Value	8,202	8,518
Associated Principal	882,860	1,002,235
Mortgage Servicing Rights | Loan Sales | Jumbo Loan
Mortgage Servicing Rights [Line Items]
MSR Fair Value	352	488
Associated Principal	33,022	58,793
Mortgage Servicing Rights | Loan Sales | Conforming Loan
Mortgage Servicing Rights [Line Items]
MSR Fair Value	55,954	38,995
Associated Principal	5,251,537	3,618,256
Mortgage Servicing Rights | Loan Purchases | Conforming Loan
Mortgage Servicing Rights [Line Items]
MSR Fair Value	30,773	47,549
Associated Principal	$ 2,952,345	$ 3,993,387

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- Definition

Mortgage Servicing Rights [Line Items]

+ References

No definition available.

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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

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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

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