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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, 2015	Dec. 31, 2014
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Notional outstanding	$ 1,594,571invest_DerivativeNotionalAmount	$ 1,529,759invest_DerivativeNotionalAmount
Other Contracts [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Notional outstanding	58,801	58,800
Weighted average life (WAL) in years	0 years 11 months	1 year 2 months 12 days
Weighted average quotes	1.00%	1.00%
CVA percentage	2.02%	2.21%
Weighted average credit rating	A	A
Fair value of derivative liabilities	$ 50	$ 328

Fair value, after offset of derivative asset, 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 and before offset against a right to receive collateral under a master netting arrangement. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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