Annual report pursuant to Section 13 and 15(d)

Effects of Derivatives Designated as Cash Flow Hedges (Detail)

v2.4.0.8
Effects of Derivatives Designated as Cash Flow Hedges (Detail) (Cash Flow Hedge, Fuel Swaps, USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Cash Flow Hedge | Fuel Swaps
     
Derivative Instruments, Gain (Loss) [Line Items]      
Gain recognized in other comprehensive income (loss) - effective portion $ 8,532 $ 18,906 $ 29,928
Gain (loss) recognized in other income (expense) - ineffective portion (345) (509) 457
Amount reclassified from accumulated other comprehensive income (loss) into fuel expense $ (6,250) $ (14,448) $ (36,686)