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Fair Value Measurements - Summary of Information about Described Model Inputs Used to Determine Fair Value of Each Class of Credit Derivatives (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Notional outstanding	$ 5,207,364	$ 11,281,777
Other Contracts [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Notional outstanding	1,102,173	1,424,623
Weighted average life (WAL) in years	6 years 10 months 24 days	7 years 10 months 24 days
Weighted average quotes	10.00%	10.00%
CVA percentage	23.70%	55.00%
Weighted average credit rating	A	A
Fair value of derivative liabilities	$ (78,739)	$ (62,854)

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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