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Amounts Included in Accumulated Other Comprehensive Loss (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			$ (6,165)
Amounts reclassified into earnings, net of taxes			1,716	169
Changes in fair value			1,161	(2,555)
Ending Balance	(3,288)		(3,288)
Fuel Hedge
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			732
Amounts reclassified into earnings, net of taxes		(685)		(1,385)
Changes in fair value	(335)	(496)	29	417
Ending Balance	761		761
Interest Rate Swap
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(6,897)
Amounts reclassified into earnings, net of taxes	864	847	1,716	1,554
Changes in fair value	1,151	(2,350)	1,132	(2,972)
Ending Balance	$ (4,049)		$ (4,049)

Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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- Definition

Amount after tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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