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Effects of Fuel Collars Designated as Cash flow Hedges (Detail)

v2.4.0.8
Effects of Fuel Collars Designated as Cash flow Hedges (Detail) (Cash Flow Hedging, Fuel Collars, USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Cash Flow Hedging | Fuel Collars
           
Fair Value, Option, Quantitative Disclosures [Line Items]            
Gain (loss) recognized in other comprehensive income (loss) - effective portion         $ 592 $ (147)
Loss recognized in other comprehensive loss- effective portion (1,500) (11,674) (1,535) (2,619)    
Gain (loss) recognized in other income (expense) - ineffective portion 14 (1,019) 22 (337) 165 (302)
Amount reclassified from accumulated other comprehensive income (loss) into fuel expense 391 (1,416) 818 (4,270) (1,954)  
Effect of derivative on consolidated financial statements         $ (1,197) $ (449)