Derivatives Measured at Fair Value and Disclosed by Balance Sheet Location (Detail) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Derivatives, Fair Value [Line Items]
Derivative assets, fair value	$ 23,899,000	$ 32,989,000
Derivative liabilities, fair value	50,272,000	39,486,000
Foreign Currency Option Contracts | Accrued expenses and other liabilities
Derivatives, Fair Value [Line Items]
Derivative liabilities, fair value	19,585	20,267
Foreign Currency Option Contracts | Other Liabilities
Derivatives, Fair Value [Line Items]
Derivative liabilities, fair value		16,443
Designated as Hedging Instrument | Fuel Swaps | Prepaid Expenses and Other Assets
Derivatives, Fair Value [Line Items]
Derivative assets, fair value	8,128	5,955
Derivative liabilities, fair value	301	876
Designated as Hedging Instrument | Fuel Swaps | Other Assets
Derivatives, Fair Value [Line Items]
Derivative assets, fair value	3,832	3,969
Derivative liabilities, fair value	281	388
Designated as Hedging Instrument | Fuel Swaps | Accrued expenses and other liabilities
Derivatives, Fair Value [Line Items]
Derivative assets, fair value		188
Derivative liabilities, fair value		204
Designated as Hedging Instrument | Fuel Swaps | Other Liabilities
Derivatives, Fair Value [Line Items]
Derivative assets, fair value		391
Derivative liabilities, fair value		42
Designated as Hedging Instrument | Fuel Collars | Prepaid Expenses and Other Assets
Derivatives, Fair Value [Line Items]
Derivative assets, fair value	1,117	1,615
Derivative liabilities, fair value	134	530
Designated as Hedging Instrument | Fuel Collars | Other Assets
Derivatives, Fair Value [Line Items]
Derivative assets, fair value	997
Derivative liabilities, fair value	545
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 Liabilities
Derivatives, Fair Value [Line Items]
Derivative assets, fair value		1,908
Derivative liabilities, fair value		1,230
Designated as Hedging Instrument | Foreign Currency Forward Contract | Prepaid Expenses and Other Assets
Derivatives, Fair Value [Line Items]
Derivative assets, fair value	3,464	11,685
Designated as Hedging Instrument | Foreign Currency Forward Contract | Accrued expenses and other liabilities
Derivatives, Fair Value [Line Items]
Derivative assets, fair value	574
Derivative liabilities, fair value	30,353
Designated as Hedging Instrument | Foreign Currency Collar | Prepaid Expenses and Other Assets
Derivatives, Fair Value [Line Items]
Derivative assets, fair value	6,361
Derivative liabilities, fair value	1,931
Designated as Hedging Instrument | Foreign Currency Collar | Other Assets
Derivatives, Fair Value [Line Items]
Derivative assets, fair value		9,765
Derivative liabilities, fair value		1,613
Not Designated as Hedging Instrument | Fuel Options | Prepaid Expenses and Other Assets
Derivatives, Fair Value [Line Items]
Derivative liabilities, fair value	134	304
Not Designated as Hedging Instrument | Fuel Options | Other Assets
Derivatives, Fair Value [Line Items]
Derivative liabilities, fair value	545
Not Designated as Hedging Instrument | Fuel Options | Other Liabilities
Derivatives, Fair Value [Line Items]
Derivative liabilities, fair value		1,231
Not Designated as Hedging Instrument | Foreign Currency Forward Contract | Accrued expenses and other liabilities
Derivatives, Fair Value [Line Items]
Derivative assets, fair value	354
Derivative liabilities, fair value	$ 334