Quarterly report pursuant to Section 13 or 15(d)

Derivatives Measured at Fair Value and Disclosed by Balance Sheet Location (Detail)

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Derivatives Measured at Fair Value and Disclosed by Balance Sheet Location (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Derivatives, Fair Value [Line Items]    
Derivative assets, fair value $ 17,661 $ 32,989
Derivative liabilities, fair value 23,409 39,486
Designated as Hedging Instrument | Fuel Swaps | Prepaid Expenses and Other Assets
   
Derivatives, Fair Value [Line Items]    
Derivative assets, fair value 4,421 5,955
Derivative liabilities, fair value 484 876
Designated as Hedging Instrument | Fuel Swaps | Other Long-term Assets
   
Derivatives, Fair Value [Line Items]    
Derivative assets, fair value 2,201 3,969
Derivative liabilities, fair value 1,890 388
Designated as Hedging Instrument | Fuel Swaps | Accrued expenses and other liabilities
   
Derivatives, Fair Value [Line Items]    
Derivative assets, fair value 669 188
Derivative liabilities, fair value 938 204
Designated as Hedging Instrument | Fuel Swaps | Other Long-term Liabilities
   
Derivatives, Fair Value [Line Items]    
Derivative assets, fair value 189 391
Derivative liabilities, fair value 180 42
Designated as Hedging Instrument | Fuel Collars | Prepaid Expenses and Other Assets
   
Derivatives, Fair Value [Line Items]    
Derivative assets, fair value 614 1,615
Derivative liabilities, fair value 322 530
Designated as Hedging Instrument | Fuel Collars | Accrued expenses and other liabilities
   
Derivatives, Fair Value [Line Items]    
Derivative assets, fair value   51
Derivative liabilities, fair value   69
Designated as Hedging Instrument | Fuel Collars | Other Long-term Liabilities
   
Derivatives, Fair Value [Line Items]    
Derivative assets, fair value 207 1,908
Derivative liabilities, fair value 202 1,230
Designated as Hedging Instrument | Foreign Currency Option Contracts | Accrued expenses and other liabilities
   
Derivatives, Fair Value [Line Items]    
Derivative liabilities, fair value 18,756 20,267
Designated as Hedging Instrument | Foreign Currency Option Contracts | Other Long-term Liabilities
   
Derivatives, Fair Value [Line Items]    
Derivative liabilities, fair value   16,443
Designated as Hedging Instrument | Foreign Currency Forward Contract | Prepaid Expenses and Other Assets
   
Derivatives, Fair Value [Line Items]    
Derivative assets, fair value   11,685
Designated as Hedging Instrument | Foreign Currency Collar | Prepaid Expenses and Other Assets
   
Derivatives, Fair Value [Line Items]    
Derivative assets, fair value 10,425  
Derivative liabilities, fair value 30  
Designated as Hedging Instrument | Foreign Currency Collar | Other Long-term Assets
   
Derivatives, Fair Value [Line Items]    
Derivative assets, fair value   9,765
Derivative liabilities, fair value   1,613
Designated as Hedging Instrument | Interest Rate Swap | Accrued expenses and other liabilities
   
Derivatives, Fair Value [Line Items]    
Derivative liabilities, fair value 898  
Designated as Hedging Instrument | Interest Rate Swap | Other Long-term Liabilities
   
Derivatives, Fair Value [Line Items]    
Derivative liabilities, fair value 2,233  
Not Designated as Hedging Instrument | Fuel Options | Prepaid Expenses and Other Assets
   
Derivatives, Fair Value [Line Items]    
Derivative liabilities, fair value 322 304
Not Designated as Hedging Instrument | Fuel Options | Other Long-term Liabilities
   
Derivatives, Fair Value [Line Items]    
Derivative liabilities, fair value $ 202 $ 1,231