Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements and Derivatives - Effects of Fuel Collars Designated as Cash flow Hedges (Detail)

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Fair Value Measurements and Derivatives - Effects of Fuel Collars Designated as Cash flow Hedges (Detail) (Cash Flow Hedging, Designated as Hedging Instrument, Fuel Collars, USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Cash Flow Hedging | Designated as Hedging Instrument | Fuel Collars
       
Derivative Instruments, Gain (Loss) [Line Items]        
Loss recognized in other comprehensive loss - effective portion $ 15 $ (1,500) $ (309) $ (1,535)
Gain recognized in other income - ineffective portion (1) 14 107 22
Amount reclassified from accumulated other comprehensive income (loss) into fuel expense $ 371 $ 391 $ 741 $ 818