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, 2014
Mar. 31, 2013
Cash Flow Hedging | Fuel Collars
   
Derivative Instruments, Gain (Loss) [Line Items]    
Loss recognized in other comprehensive loss - effective portion $ (324) $ (35)
Gain recognized in other income - ineffective portion 108 8
Amount reclassified from accumulated other comprehensive income (loss) into fuel expense $ 370 $ 427