Annual report pursuant to Section 13 and 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
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Cash Flow Hedging | Fuel Collars
     
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (loss) recognized in other comprehensive income (loss) - effective portion $ (1,152) $ 592 $ (147)
Gain (loss) recognized in other income (expense) - ineffective portion (26) 165 (302)
Amount reclassified from accumulated other comprehensive income (loss) into fuel expense $ 1,547 $ (1,954)