Quarterly report pursuant to Section 13 or 15(d)

Outstanding Derivatives Classified as Current or Noncurrent Based on Derivatives' Maturity Dates (Detail)

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Outstanding Derivatives Classified as Current or Noncurrent Based on Derivatives' Maturity Dates (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2011
Derivative Instruments and Hedging Activities Disclosure [Line Items]      
Other current assets $ 50,313 $ 39,076 $ 21,421
Accrued current liabilities (18,739) (19,326) (58,040)
Other assets (noncurrent) 6,822 7,252 2,418
Other liabilities (noncurrent) $ (2,879) $ (4,187) $ (5,866)