Quarterly report pursuant to Section 13 or 15(d)

Effects of Derivatives Designated as Cash Flow Hedges (Detail)

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Effects of Derivatives Designated as Cash Flow Hedges (Detail) (Cash Flow Hedge, Fuel Swaps, USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Cash Flow Hedge | Fuel Swaps
       
Fair Value, Option, Quantitative Disclosures [Line Items]        
Loss recognized in other comprehensive loss - effective portion $ (18,074) $ (34,283) $ (13,368) $ (7,819)
Loss recognized in other income (expense) - ineffective portion (320) (1,843) (99) (599)
Amount reclassified from accumulated other comprehensive income (loss) into fuel expense $ (736) $ (3,093) $ (2,999) $ (12,332)