Quarterly report pursuant to Section 13 or 15(d)

Effects of Derivatives Designated as Cash Flow Hedges (Detail)

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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 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Cash Flow Hedge | Fuel Swaps
       
Derivative Instruments, Gain (Loss) [Line Items]        
Gain recognized in other comprehensive loss - effective portion $ 13,500 $ 30,848 $ 132 $ 23,029
Gain (loss) recognized in other income (expense) - ineffective portion (83) 157 (182) (473)
Amount reclassified from accumulated comprehensive income (loss) into fuel expense $ (2,081) $ (1,600) $ (5,080) $ (13,932)