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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
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

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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