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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	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Notional outstanding	$ 2,491,138	$ 2,776,103
Other Contracts [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Notional outstanding	58,920	146,995
Weighted average life (WAL) in years	1 year 10 months 24 days	1 year
Weighted average quotes	4.00%	1.00%
CVA percentage	6.70%	8.70%
Weighted average credit rating	A	A+
Fair value of derivative liabilities	$ (1,686)	$ (1,549)

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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