Derivative Liabilities Recognized in Current Installments of Other Liabilities in Condensed Consolidated Balance Sheets (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014
Derivatives, Fair Value [Line Items]
Gross Amounts of Recognized Liabilities	$ (138)
Gross Amounts Offset in the Statement of Financial Position
Net Amounts of Liabilities Presented in the Statement of Financial Position	(138)
Financial Instruments
Cash Collateral Pledged
Net Amount	(138)
Bank of the West
Derivatives, Fair Value [Line Items]
Gross Amounts of Recognized Liabilities	(138)
Gross Amounts Offset in the Statement of Financial Position
Net Amounts of Liabilities Presented in the Statement of Financial Position	(138)
Financial Instruments
Cash Collateral Pledged
Net Amount	$ (138)

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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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 liabilities not subject to a master netting arrangement and not elected to be offset.

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