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Gross Amounts Associated With Derivative Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Interest Rate Swap
Derivative [Line Items]
Assets	$ 25,921
Assets, Net Amount	25,921
Liabilities	157,869	243,945
Liabilities, Cash Collateral Posted	144,348	281,021
Liabilities, Net Amount	13,521	(37,076)
Futures Contracts
Derivative [Line Items]
Assets	5,587
Assets, Cash Collateral Posted	4,862
Assets, Net Amount	10,449
Forward Purchase Commitments
Derivative [Line Items]
Assets		5,452
Assets, Net Amount		$ 5,452

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