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Interest Rate Hedging - Financial Assets and Liabilities Valued on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 867us-gaap_DerivativeAssets
Derivative Liabilities	(1,298)us-gaap_DerivativeLiabilities
Derivative Assets and Liabilities, Total	(431)
Significant Other Observable Inputs Level2 Member
Derivatives, Fair Value [Line Items]
Derivative Assets	867
Derivative Liabilities	(1,298)
Derivative Assets and Liabilities, Total	(431)
Significant Unobservable Inputs Level 3 Member
Derivatives, Fair Value [Line Items]
Derivative Liabilities	$ 0

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

+ References+ Details