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Residential Mortgage-Backed Securities - Non-Agency Securities Having Deteriorated Credit When Acquired (Detail) (Non Agency Residential Mortgage Backed Securities Having Deteriorated Credit When Acquired [Member], USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Jun. 30, 2012	Dec. 31, 2011	Sep. 30, 2011
Non Agency Residential Mortgage Backed Securities Having Deteriorated Credit When Acquired [Member]
Investment Holdings [Line Items]
Loans acquired having deteriorated credit, outstanding principal	$ 4,690,083	$ 4,878,479	$ 5,245,184	$ 5,264,486
Loans acquired having deteriorated credit, carrying value	$ 2,333,309	$ 2,420,502	$ 2,649,303	$ 2,761,672

The recorded balance, net of any applicable reductions (for example, unamortized accretable yield and allowance for loan losses). This relates to loans not accounted for debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

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- Definition

The undiscounted sum of all amounts, including amounts deemed principal, interest, fees, penalties, and other under the loan, owed to the investor at the reporting date, whether or not currently due and whether or not any such amounts have been written or charged off by the investor. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

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