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Derivatives Measured at Fair Value and Disclosed by Balance Sheet Location (Detail) (USD $)
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Mar. 31, 2013
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Dec. 31, 2012
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| 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 |
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Foreign Currency Option Contracts | Accrued expenses and other liabilities
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| Derivatives, Fair Value [Line Items] | ||
| Derivative liabilities, fair value | 19,585 | 20,267 |
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Foreign Currency Option Contracts | Other Liabilities
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| Derivatives, Fair Value [Line Items] | ||
| Derivative liabilities, fair value | 16,443 | |
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Designated as Hedging Instrument | Fuel Swaps | Prepaid Expenses and Other Assets
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| Derivatives, Fair Value [Line Items] | ||
| Derivative assets, fair value | 8,128 | 5,955 |
| Derivative liabilities, fair value | 301 | 876 |
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Designated as Hedging Instrument | Fuel Swaps | Other Assets
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| Derivatives, Fair Value [Line Items] | ||
| Derivative assets, fair value | 3,832 | 3,969 |
| Derivative liabilities, fair value | 281 | 388 |
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Designated as Hedging Instrument | Fuel Swaps | Accrued expenses and other liabilities
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| Derivatives, Fair Value [Line Items] | ||
| Derivative assets, fair value | 188 | |
| Derivative liabilities, fair value | 204 | |
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Designated as Hedging Instrument | Fuel Swaps | Other Liabilities
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| Derivatives, Fair Value [Line Items] | ||
| Derivative assets, fair value | 391 | |
| Derivative liabilities, fair value | 42 | |
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Designated as Hedging Instrument | Fuel Collars | Prepaid Expenses and Other Assets
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| Derivatives, Fair Value [Line Items] | ||
| Derivative assets, fair value | 1,117 | 1,615 |
| Derivative liabilities, fair value | 134 | 530 |
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Designated as Hedging Instrument | Fuel Collars | Other Assets
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| Derivatives, Fair Value [Line Items] | ||
| Derivative assets, fair value | 997 | |
| Derivative liabilities, fair value | 545 | |
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Designated as Hedging Instrument | Fuel Collars | Accrued expenses and other liabilities
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| Derivatives, Fair Value [Line Items] | ||
| Derivative assets, fair value | 51 | |
| Derivative liabilities, fair value | 69 | |
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Designated as Hedging Instrument | Fuel Collars | Other Liabilities
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| Derivatives, Fair Value [Line Items] | ||
| Derivative assets, fair value | 1,908 | |
| Derivative liabilities, fair value | 1,230 | |
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Designated as Hedging Instrument | Foreign Currency Forward Contract | Prepaid Expenses and Other Assets
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| Derivatives, Fair Value [Line Items] | ||
| Derivative assets, fair value | 3,464 | 11,685 |
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Designated as Hedging Instrument | Foreign Currency Forward Contract | Accrued expenses and other liabilities
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| Derivatives, Fair Value [Line Items] | ||
| Derivative assets, fair value | 574 | |
| Derivative liabilities, fair value | 30,353 | |
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Designated as Hedging Instrument | Foreign Currency Collar | Prepaid Expenses and Other Assets
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| Derivatives, Fair Value [Line Items] | ||
| Derivative assets, fair value | 6,361 | |
| Derivative liabilities, fair value | 1,931 | |
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Designated as Hedging Instrument | Foreign Currency Collar | Other Assets
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| Derivatives, Fair Value [Line Items] | ||
| Derivative assets, fair value | 9,765 | |
| Derivative liabilities, fair value | 1,613 | |
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Not Designated as Hedging Instrument | Fuel Options | Prepaid Expenses and Other Assets
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| Derivatives, Fair Value [Line Items] | ||
| Derivative liabilities, fair value | 134 | 304 |
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Not Designated as Hedging Instrument | Fuel Options | Other Assets
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| Derivatives, Fair Value [Line Items] | ||
| Derivative liabilities, fair value | 545 | |
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Not Designated as Hedging Instrument | Fuel Options | Other Liabilities
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| Derivatives, Fair Value [Line Items] | ||
| Derivative liabilities, fair value | 1,231 | |
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Not Designated as Hedging Instrument | Foreign Currency Forward Contract | Accrued expenses and other liabilities
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| Derivatives, Fair Value [Line Items] | ||
| Derivative assets, fair value | 354 | |
| Derivative liabilities, fair value | $ 334 |