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Gross Amounts Associated With Derivative Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Interest Rate Swap
Derivative [Line Items]
Assets/(Liabilities)	$ 13,626
Net Asset/(Liability)	13,626
Assets/(Liabilities)	(147,954)	(243,945)
Cash Collateral Posted	147,324	281,021
Net Asset/(Liability)	(630)	37,076
Forward Purchase Commitments
Derivative [Line Items]
Assets/(Liabilities)	6,904	5,452
Cash Collateral Posted	1,578
Net Asset/(Liability)	8,482	5,452
Futures Contracts
Derivative [Line Items]
Assets/(Liabilities)	(44,593)
Cash Collateral Posted	92,951
Net Asset/(Liability)	$ 48,358

Fair value, after the effects of master netting arrangements, of a financial asset or other 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. Includes assets not subject to a master netting arrangement and not elected to be offset.

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- Definition

Fair value, after the effects of master netting arrangements, of a 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. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References+ Details