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Derivative Financial Instruments and Fair Value Measurements - Summary of Derivative Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Commodities Contracts
Derivatives, Fair Value [Line Items]
Asset, Fair Value	$ 969	$ 1,740
Liability - Interest rate swap contracts	318	1,885
Interest Rate Swap Contracts
Derivatives, Fair Value [Line Items]
Liability - Interest rate swap contracts		28,148
Level 2 \| Commodities Contracts
Derivatives, Fair Value [Line Items]
Asset, Fair Value	969	1,740
Liability - Interest rate swap contracts	318	1,885
Level 2 \| Interest Rate Swap Contracts
Derivatives, Fair Value [Line Items]
Liability - Interest rate swap contracts		$ 28,148

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