Quarterly report pursuant to Section 13 or 15(d)

Effects of Fuel Collars Designated as Cash flow Hedges (Detail)

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Effects of Fuel Collars Designated as Cash flow Hedges (Detail) (Cash Flow Hedging, Fuel Collars, USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Cash Flow Hedging | Fuel Collars
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Gain (loss) recognized in other comprehensive income (loss) - effective portion $ (35) $ 9,055
Gain recognized in other income (expense) - ineffective portion 8 682
Amount reclassified from accumulated other comprehensive income (loss) into fuel expense $ 427 $ (2,854)