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Derivatives and Fair Value Measurements - Significant Other Observable Inputs (Detail) (Level 2 - Significant other observable inputs [Member], USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Derivatives, Fair Value [Line Items]
Net Assets (Liabilities)	$ (5,036)	$ (2,389)
Swaps [Member] \| Deferred charges and other assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets		6
Swaps [Member] \| Other current liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities	(4,257)	(2,076)
Swaps [Member] \| Other deferred credits [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities	$ (779)	$ (319)

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