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Derivatives Measured at Fair Value and Disclosed by Balance Sheet Location (Detail) (USD $)
In Thousands, unless otherwise specified |
Jun. 30, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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|---|---|---|---|
| Derivatives, Fair Value [Line Items] | |||
| Derivative assets, fair value | $ 7,512 | $ 32,989 | |
| Derivative liabilities, fair value | 31,420 | 39,486 | |
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Foreign Currency Option Contracts | Accrued expenses and other liabilities
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| Derivatives, Fair Value [Line Items] | |||
| Derivative, fair value | (20,267) | ||
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Foreign Currency Option Contracts | Other Liabilities
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| Derivatives, Fair Value [Line Items] | |||
| Derivative, fair value | (16,443) | (15,927) | |
|
Designated as Hedging Instrument | Fuel Swaps | Prepaid Expenses and Other Assets
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| Derivatives, Fair Value [Line Items] | |||
| Derivative, fair value | 5,079 | 5,484 | |
| 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, fair value | 3,581 | ||
| 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, fair value | (16) | ||
| 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, fair value | 349 | (440) | |
| 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, fair value | 1,085 | 4,377 | |
| Derivative assets, fair value | 111 | 1,615 | |
| Derivative liabilities, fair value | 30 | 530 | |
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Designated as Hedging Instrument | Fuel Collars | Other Assets
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| Derivatives, Fair Value [Line Items] | |||
| Derivative, fair value | 740 | ||
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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, fair value | (18) | ||
| 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, fair value | 678 | ||
| 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, fair value | 11,685 | ||
| 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, fair value | 8,152 | ||
| 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, fair value | (304) | ||
| Derivative liabilities, fair value | 30 | 304 | |
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Not Designated as Hedging Instrument | Fuel Options | Other Assets
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| Derivatives, Fair Value [Line Items] | |||
| Derivative, fair value | (1,278) | ||
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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, fair value | (1,231) | (1,670) | |
| Derivative liabilities, fair value | $ 533 | $ 1,231 |