Quarterly report pursuant to Section 13 or 15(d)

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

v2.4.0.8
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 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Cash Flow Hedging | Designated as Hedging Instrument | Fuel Swaps
       
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) recognized in other comprehensive income (loss) - effective portion $ 11,610 $ (18,074) $ 1,839 $ (13,368)
Gain (loss) recognized in other income (expense) - ineffective portion 451 (320) 35 (99)
Amount reclassified from accumulated other comprehensive income (loss) into fuel expense $ (1,218) $ (736) $ (1,923) $ (2,999)