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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 | Mar. 31, 2013 | Dec. 31, 2012
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Derivatives, Fair Value [Line Items] |  |
Derivative liability, notional | $ 7,426,901 | $ 6,179,343
Derivative liability, Fair Value | 2,525 | 3,057
Euro Dollars Futures [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, notional |  | 15,000
Derivative liability, Fair Value |  | 4
Commodity Contract [Member] | U.S. Treasury Futures [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, notional | 57,600 | 56,000
Derivative liability, Fair Value | 360 | 286
Commodity Contract [Member] | Federal Funds Futures [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, notional | 7,330,000 | 6,070,000
Derivative liability, Fair Value | 71 | 120
Other Contract [Member] | Auction rate securities purchase commitments [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, notional | 39,301 | 38,343
Derivative liability, Fair Value | $ 2,094 | $ 2,647

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- Definition Fair value of the gross liabilities less the gross assets of a derivative liability or group of derivative liabilities. + 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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- Definition Total monetary amount specified by the derivative liability (or liabilities). Expressed as an absolute value. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 Reference 3: 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 + Details
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