Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements and Derivatives - Effects of Derivatives Designated as Cash Flow Hedges (Detail)

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Fair Value Measurements and Derivatives - Effects of Derivatives Designated as Cash Flow Hedges (Detail) (Cash Flow Hedging, Designated as Hedging Instrument, Fuel Swaps, 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 Swaps
       
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) recognized in other comprehensive income - effective portion $ (27,777) $ 13,500 $ (25,938) $ 132
Loss recognized in other income (expense) - ineffective portion (51) (83) (16) (182)
Amount reclassified from accumulated other comprehensive income (loss) into fuel expense $ 578 $ (2,081) $ (1,345) $ (5,080)