Derivative Financial Instruments and Fair Value Measurements - Derivatives Recorded at Fair Value in Consolidated Balance Sheets (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014		Dec. 31, 2013
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 600		$ 969
Derivative Liabilities	132		318
Designated As Hedging Instrument | Current | Commodities Contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	0	[1]	714	[1]
Derivative Liabilities	0	[1]	204	[1]
Not Designated As Hedging Instruments | Current | Commodities Contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	600	[1]	255	[1]
Derivative Liabilities	$ 132	[1]	$ 114	[1]

[1] Derivative assets and liabilities that have settlement dates equal to or less than 12 months from the respective balance sheet date are included in other current assets and accounts payable and accrued expenses, respectively, in our unaudited Condensed Consolidated Balance Sheets.