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 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Cash Flow Hedging | Designated as Hedging Instrument | Fuel Collars
       
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) recognized in other comprehensive income - effective portion $ (127) $ 427 $ (436) $ (1,108)
Gain (loss) recognized in other income (expense) - ineffective portion 4 (51) 111 (29)
Amount reclassified from accumulated other comprehensive income (loss) into fuel expense $ 370 $ 332 $ 1,111 $ 1,150