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Derivatives Measured at Fair Value and Disclosed by Balance Sheet Location (Detail) (USD $)
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Jun. 30, 2013
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Dec. 31, 2012
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| Derivatives, Fair Value [Line Items] | ||
| Derivative assets, fair value | $ 7,512,000 | $ 32,989,000 |
| Derivative liabilities, fair value | 31,420,000 | 39,486,000 |
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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 | 515 | 5,955 |
| Derivative liabilities, fair value | 426 | 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 | 3,969 | |
| Derivative liabilities, fair value | 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 | 1,514 | 188 |
| Derivative liabilities, fair value | 4,548 | 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 | 589 | 391 |
| Derivative liabilities, fair value | 5,075 | 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 | 111 | 1,615 |
| Derivative liabilities, fair value | 30 | 530 |
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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 | 385 | 51 |
| Derivative liabilities, fair value | 391 | 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 | 406 | 1,908 |
| Derivative liabilities, fair value | 533 | 1,230 |
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Designated as Hedging Instrument | Foreign Currency Option Contracts | Accrued expenses and other liabilities
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| Derivatives, Fair Value [Line Items] | ||
| Derivative liabilities, fair value | 19,949 | 20,267 |
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Designated as Hedging Instrument | 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 | Foreign Currency Forward Contract | Prepaid Expenses and Other Assets
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| Derivatives, Fair Value [Line Items] | ||
| Derivative assets, fair value | 11,685 | |
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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 | 6,886 | |
| Derivative liabilities, fair value | 1,009 | |
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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 | 30 | 304 |
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Not Designated as Hedging Instrument | Fuel Options | Accrued expenses and other liabilities
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| Derivatives, Fair Value [Line Items] | ||
| Derivative liabilities, fair value | 391 | |
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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 | $ 533 | $ 1,231 |