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 Hedging, Fuel Swaps, USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Cash Flow Hedging | Fuel Swaps
   
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (loss) recognized in other comprehensive loss - effective portion $ (9,771) $ 4,706
Gain (loss) recognized in other income - ineffective portion (416) 221
Amount reclassified from accumulated other comprehensive income (loss) into fuel expense $ (705) $ (2,263)