Unobservable Inputs Used in Valuation of Level 3 Financial Instruments (Detail) (Fair Value, Inputs, Level 3, Private Debt Obligations, USD $) In Thousands, unless otherwise specified	6 Months Ended
Jun. 30, 2012
Group One \| Minimum
Financial Instruments [Line Items]
Fair Value	$ 12,436
Valuation Technique	Discounted cash flow
Unobservable Input	Constant Prepayment rate
Range	15.00%
Weighted Average	18.00%
Group One \| Maximum
Financial Instruments [Line Items]
Fair Value	12,436
Valuation Technique	Discounted Cash flow
Unobservable Input	Constant prepayment rate
Range	20.00%
Weighted Average	18.00%
Group Two
Financial Instruments [Line Items]
Fair Value	12,436
Valuation Technique	Discounted cash flow
Unobservable Input	Probability of default
Range	2.00%
Weighted Average	2.00%
Group Three \| Minimum
Financial Instruments [Line Items]
Fair Value	12,436
Valuation Technique	Discounted cash flow
Unobservable Input	Recovery rate
Range	50.00%
Weighted Average	60.00%
Group Three \| Maximum
Financial Instruments [Line Items]
Fair Value	$ 12,436
Valuation Technique	Discounted cash flow
Unobservable Input	Recovery rate
Range	70.00%
Weighted Average	60.00%

Financial Instruments Fair Value Assumptions Weighted Average Rate

No definition available.

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- Definition

Financial Instruments Fair Value Assumptions Weighted Average Rate Range

+ References

No definition available.

+ Details

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- Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Description of significant assumptions used by management to measure fair value.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611

+ Details

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Namespace Prefix:	us-gaap_
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- Definition

Description of the inputs and valuation technique(s) used to measure fair value.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

+ Details

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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents investment securities as of the balance sheet date which may include marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Trading Securities

-URI http://asc.fasb.org/extlink&oid=6526789

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 13

-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.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Subparagraph a, f, g

-Article 7

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Available-for-Sale Securities

-URI http://asc.fasb.org/extlink&oid=6505594

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 12

-Subparagraph a

-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.

Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 35

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=16383099&loc=d3e24584-111560

+ Details

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Balance Type:	debit
Period Type:	instant