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Other Comprehensive Income (Loss) (Amounts Included in Accumulated Other Comprehensive Loss) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Components of Other Comprehensive Income (Loss) [Line Items]
Beginning balance			$ (1,869)
Amounts reclassified into earnings			818	1,716
Changes in fair value			(1,429)	1,161
Ending balance	(2,480)		(2,480)
Interest Rate Swap [Member]
Components of Other Comprehensive Income (Loss) [Line Items]
Beginning balance			(3,226)
Amounts reclassified into earnings	546	864	1,205	1,716
Changes in fair value	(1,362)	1,151	(1,539)	1,132
Ending balance	(3,560)		(3,560)
Fuel [Member] \| Commodity Contract [Member]
Components of Other Comprehensive Income (Loss) [Line Items]
Beginning balance			1,357
Amounts reclassified into earnings	(187)		(387)
Changes in fair value	287	(335)	110	29
Ending balance	$ 1,080		$ 1,080

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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