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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 9 Months Ended 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Cash Flow Hedging | Fuel Collars
           
Derivative Instruments, Gain (Loss) [Line Items]            
Gain (loss) recognized in other comprehensive income (loss) - effective portion $ 427 $ 5,060 $ (1,108) $ 2,441 $ 592 $ (147)
Gain (loss) recognized in other income (expense) - ineffective portion (51) 479 (29) 142 165 (302)
Amount reclassified from accumulated other comprehensive income (loss) into fuel expense 332 (1,107) 1,150 (5,377) (1,954)  
Effect of derivative on consolidated financial statements         $ (1,197) $ (449)