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Residential Loans - Carrying Value for Residential Loans Held-for-Investment at Amortized Cost (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Mortgage Loans on Real Estate [Line Items]
Carrying Value	$ 4,036,674	$ 3,398,573
Residential Loans Held for Investment
Mortgage Loans on Real Estate [Line Items]
Principal balance	1,275,609	1,483,213
Unamortized premium, net	0	12,511
Allowance for loan losses	0	(21,338)
Valuation adjustment	(105,363)	0
Carrying Value	$ 1,170,246	$ 1,474,386

X

- Definition

Financing Receivable, Valuation Adjustment

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

X

- Definition

The reserve to cover probable credit losses related to specifically identified fixed maturity real estate loans as well as probable credit losses inherent in the remainder of that loan portfolio.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 944



-SubTopic 310



-Section 45



-Paragraph 4



-URI http://asc.fasb.org/extlink&oid=6873192&loc=d3e21338-158488

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	instant

X

- Definition

Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of consumer loans, including, but not limited to, mortgage, home equity, vehicles, credit card, installment, and lease financing. Excludes loans and leases covered under loss sharing agreements.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 310



-SubTopic 10



-Section 50



-Paragraph 3



-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5066-111524



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-Name Accounting Standards Codification



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-Topic 310



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X

- 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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X

- Definition

This is the sum of principal amount outstanding for both securitized and unsecuritized loans of all types.

+ 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)



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- Definition

Amount of deferred fees paid by borrowers and unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of loans that are being amortized into income as an adjustment to yield. Excludes amounts for loans and leases covered under loss sharing agreements.

+ References

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



-Publisher FASB



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-Topic 310



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-URI http://asc.fasb.org/extlink&oid=6378536&loc=d3e10092-111533

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