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Derivative Instruments - Summary of Location and Fair Values of Individual Derivative Instruments (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011
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Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Fair value of derivative liabilities | $ (52,535) |
Fair value of derivative liabilities | 187,121 | 190,653
Consolidated Entity Excluding Variable Interest Entities VIE [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Derivative Asset Net, Fair Value | 263,809 | 448,566
Fair value of derivative liabilities | 621,932 | 687,867
Consolidated Entity Excluding Variable Interest Entities VIE [Member] | Total Derivatives Held For Trading [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Derivative Asset Net, Fair Value | 263,809 | 442,511
Fair value of derivative liabilities | 621,932 | 687,867
Variable Interest Entity [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Derivative Asset Net, Fair Value |  | 27,779
Fair value of derivative liabilities | 2,060,951 | 2,114,831
Derivatives Liability [Member] | Consolidated Entity Excluding Variable Interest Entities VIE [Member] | Total Derivatives Held For Trading [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Derivative Asset Fair Value, Gross Liability | 166,345 | 30,859
Fair value of derivative liabilities | 255 |
Derivatives Assets [Member] | Consolidated Entity Excluding Variable Interest Entities VIE [Member] | Total Derivatives Held For Trading [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Derivative Liabilities, Fair Value |  | 242,500
Credit Derivatives [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Fair value of derivative liabilities | (187,121) | (190,653)
Credit Derivatives [Member] | Variable Interest Entity [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Fair value of derivative liabilities | 20,747 | 20,934
Credit Derivatives [Member] | Derivatives Liability [Member] | Consolidated Entity Excluding Variable Interest Entities VIE [Member] | Total Derivatives Held For Trading [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Fair value of derivative liabilities | 187,121 | 190,653
Interest Rate Swaps [Member] | Derivatives Liability [Member] | Consolidated Entity Excluding Variable Interest Entities VIE [Member] | Total Derivatives Held For Trading [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Fair value of derivative liabilities | 432,581 | 251,303
Interest Rate Swaps [Member] | Derivatives Liability [Member] | Variable Interest Entity [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Fair value of derivative liabilities | 1,981,460 | 2,023,974
Interest Rate Swaps [Member] | Derivatives Assets [Member] | Consolidated Entity Excluding Variable Interest Entities VIE [Member] | Total Derivatives Held For Trading [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Derivative Asset Net, Fair Value | 97,464 | 411,652
Currency Swaps [Member] | Derivatives Liability [Member] | Consolidated Entity Excluding Variable Interest Entities VIE [Member] | Total Derivatives Held For Trading [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Fair value of derivative liabilities |  | 2,423
Currency Swaps [Member] | Derivatives Liability [Member] | Variable Interest Entity [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Derivative Asset Net, Fair Value |  | 27,779
Fair value of derivative liabilities | 79,491 | 90,857
Futures Contracts [Member] | Derivatives Liability [Member] | Consolidated Entity Excluding Variable Interest Entities VIE [Member] | Total Derivatives Held For Trading [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Fair value of derivative liabilities | 1,975 | 627
Other Contracts [Member] | Derivatives Liability [Member] | Consolidated Entity Excluding Variable Interest Entities VIE [Member] | Total Derivatives Held For Trading [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Fair value of derivative liabilities |  | 361
Third call option [Member] | Derivatives Assets [Member] | Consolidated Entity Excluding Variable Interest Entities VIE [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Derivative Asset Net, Fair Value |  | $ 6,055

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- Definition Fair value of liability associated with derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph a -Clause 1 -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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- Definition Fair value of the gross assets less the gross liabilities of a derivative asset or group of derivative assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13495-108611 + Details
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