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Summary of Outstanding Balances, Maximum and Average Balances of Borrowings (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Balance	$ 225,158	$ 542,027
Wells Facility borrowings [Member]
Debt Instrument [Line Items]
Balance	225,155	221,980
Maximum Month-End Balance	469,147	242,728
Average Month-End Balance	283,100	233,829
JPMorgan Facility borrowings [Member]
Debt Instrument [Line Items]
Balance	3	68,720
Maximum Month-End Balance	68,720	69,014
Average Month-End Balance	37,461	52,261
TALF borrowings [Member]
Debt Instrument [Line Items]
Balance		251,327
Maximum Month-End Balance	251,327	297,334
Average Month-End Balance	$ 19,333	$ 271,035

X

- Definition

Debt instrument average outstanding amount.

+ References

No definition available.

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X

- Definition

Debt instrument maximum month end outstanding amount.

+ References

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X

- Definition

Carrying value, as of the balance sheet date, of securities sold under agreements to repurchase where the transferor maintains effective control over the assets, accounting for them as secured debt.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(m)(1)(i))

-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 10

-Section 55

-Paragraph 51

-URI http://asc.fasb.org/extlink&oid=7580763&loc=d3e101761-111710



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 140

-Paragraph 48, 100

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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