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Fair Value of Derivative Instruments and Location in Financial Statements (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Cash Flow Hedging | Prepaid Expenses and Other Current Assets
   
Derivatives, Fair Value [Line Items]    
Fair value of assets $ 4,790 $ 6,972
Cash Flow Hedging | Other Assets
   
Derivatives, Fair Value [Line Items]    
Fair value of assets 1,660 1,931
Cash Flow Hedging | Accrued Expenses and Other Current Liabilities
   
Derivatives, Fair Value [Line Items]    
Fair value of liabilities 99,486 60,229
Cash Flow Hedging | Other Liabilities
   
Derivatives, Fair Value [Line Items]    
Fair value of liabilities 166,571 112,430
Not Designated as Hedging Instrument | Prepaid Expenses and Other Current Assets
   
Derivatives, Fair Value [Line Items]    
Fair value of assets 318 1,742
Not Designated as Hedging Instrument | Accrued Expenses and Other Current Liabilities
   
Derivatives, Fair Value [Line Items]    
Fair value of liabilities $ 11,402 $ 1,417