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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	Sep. 30, 2013	Dec. 31, 2012
Derivatives, Fair Value [Line Items]
Derivative liability, notional	$ 6,134,797	$ 6,179,343
Derivative liability, Fair Value	3,387	3,057
Commodity Contracts [Member] \| U.S. Treasury Futures [Member]
Derivatives, Fair Value [Line Items]
Derivative liability, notional	73,600	56,000
Derivative liability, Fair Value	771	286
Commodity Contracts [Member] \| Federal Funds Futures [Member]
Derivatives, Fair Value [Line Items]
Derivative liability, notional	5,920,000	6,070,000
Derivative liability, Fair Value	180	120
Commodity Contracts [Member] \| Euro Dollars Futures [Member]
Derivatives, Fair Value [Line Items]
Derivative liability, notional	105,000	15,000
Derivative liability, Fair Value	24	4
Other Contracts [Member] \| ARS Purchase Commitment [Member]
Derivatives, Fair Value [Line Items]
Derivative liability, notional	36,197	38,343
Derivative liability, Fair Value	$ 2,412	$ 2,647

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.

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