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Derivative Instruments - Summary of Location and Amount of Gains and Losses of Derivative Contracts (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2013 | Mar. 31, 2012
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Derivative, gain (loss) on derivative, net, Total | $ (83,626) | $ 183,923
Variable interest entity [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Derivative, gain (loss) on derivative, net, Total | (95,844) | 82,508
Financial Services derivatives products [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Derivative, gain (loss) on derivative, net, Total | (569) | 46,957
Credit derivatives [Member] | Financial guarantee [Member] | Net change in fair value of credit derivatives [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Derivative instruments, gain (loss) recognized in income, net, Total | 12,787 | (7,222)
Interest rate swaps [Member] | Income on variable interest entities [Member] | Variable interest entity [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Derivative instruments, gain (loss) recognized in income, net, Total | (100,548) | 93,715
Interest rate swaps [Member] | Financial Services derivatives products [Member] | Derivative products [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Derivative instruments, gain (loss) recognized in income, net, Total | (1,022) | 42,185
Currency swaps [Member] | Income on variable interest entities [Member] | Variable interest entity [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Derivative instruments, gain (loss) recognized in income, net, Total | 4,704 | (11,207)
Currency swaps [Member] | Financial Services derivatives products [Member] | Derivative products [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Derivative instruments, gain (loss) recognized in income, net, Total | 0 | 156
Futures contracts [Member] | Financial Services derivatives products [Member] | Derivative products [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Derivative instruments, gain (loss) recognized in income, net, Total | 455 | 4,308
Other contracts [Member] | Financial Services derivatives products [Member] | Derivative products [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Derivative instruments, gain (loss) recognized in income, net, Total | (2) | 308
Third call option [Member] | Other income [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Derivative instruments, gain (loss) recognized in income, net, Total |  | $ 61,680

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- Definition Net Increase or Decrease in the fair value of the derivative or group of derivatives included in earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959 + Details
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- Definition The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph b -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 FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959 + Details
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