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Effects of Derivatives Designated as Cash Flow Hedges (Detail) (Cash Flow Hedge, Fuel Swaps, USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash Flow Hedge \| Fuel Swaps
Fair Value, Option, Quantitative Disclosures [Line Items]
Gain recognized in other comprehensive income (loss) - effective portion	$ 4,706	$ 26,464
Gain recognized in other income (expense) - ineffective portion	221	1,244
Amount reclassified from accumulated other comprehensive income (loss) into fuel expense	$ (2,263)	$ (9,239)

The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

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- Definition

The effective portion of gain reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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- Definition

The effective portion of gains on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

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