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Summary of Fair Value Information about Derivative Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Derivatives, Fair Value [Line Items]
Derivative assets	$ 217,473	$ 705,769
Derivative liabilities	857,658	1,197,346
Interest Rate Swaps
Derivatives, Fair Value [Line Items]
Derivative assets	198,066	559,044
Derivative liabilities	857,658	1,141,828
Other Derivative Contracts \| Interest Rate Swaption
Derivatives, Fair Value [Line Items]
Derivative assets	12,268	110,361
Derivative liabilities		24,662
Other Derivative Contracts \| TBA Derivatives
Derivatives, Fair Value [Line Items]
Derivative assets	459	20,693
Derivative liabilities		13,779
Other Derivative Contracts \| Collateralized Mortgage Backed Securities
Derivatives, Fair Value [Line Items]
Derivative assets		12,184
Derivative liabilities		16,638
Other Derivative Contracts \| Futures Contracts
Derivatives, Fair Value [Line Items]
Derivative assets	6,680	3,487
Derivative liabilities		$ 439

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.

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