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Financial Instruments - Notional Amounts and Fair Values of Derivatives by Product (Detail) (Not Designated as Hedging Instrument [Member], USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
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Derivatives, Fair Value [Line Items] |  |
Derivative liability, notional | $ 5,702,884 | $ 6,179,343
Derivative liability, Fair Value | 2,770 | 3,057
Commodity Contract [Member] | U.S. Treasury Futures [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, notional | 51,000 | 56,000
Derivative liability, Fair Value | 401 | 286
Commodity Contract [Member] | Federal Funds Futures [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, notional | 5,550,000 | 6,070,000
Derivative liability, Fair Value | 29 | 120
Commodity Contract [Member] | Euro Dollars Futures [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, notional | 68,000 | 15,000
Derivative liability, Fair Value | 11 | 4
Other Contract [Member] | ARS Purchase Commitments [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, notional | 33,884 | 38,343
Derivative liability, Fair Value | $ 2,329 | $ 2,647

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- Definition Fair value of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be offset against a right to receive collateral under a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=d3e41678-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226011-175313 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226006-175313 + Details
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- Definition Nominal or face amount used to calculate payments on the derivative liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 + Details
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