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 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Cash Flow Hedging | Fuel Collars
       
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) recognized in other comprehensive loss - effective portion $ 427 $ 5,060 $ (1,108) $ 2,441
Gain (loss) recognized in other income (expense) - ineffective portion (51) 479 (29) 142
Amount reclassified from other comprehensive income (loss) into fuel expense $ 332 $ (1,107) $ 1,150 $ (5,377)