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Other Comprehensive Income (Loss) (Amounts Included in Accumulated Other Comprehensive Loss) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Components of Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ (1,869)	$ (6,165)
Amounts reclassified into earnings	2,317	3,483	481
Changes in fair value	(6,041)	813	(3,166)
Ending balance	(5,593)	(1,869)	(6,165)
Interest Rate Swap [Member]
Components of Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(3,226)	(6,897)
Amounts reclassified into earnings	2,824	3,483	3,279
Changes in fair value	(3,970)	188	(4,524)
Ending balance	(4,372)	(3,226)	(6,897)
Fuel [Member] \| Commodity Contract [Member]
Components of Other Comprehensive Income (Loss) [Line Items]
Beginning balance	1,357	732
Amounts reclassified into earnings	(507)		(2,798)
Changes in fair value	(2,071)	625	1,358
Ending balance	$ (1,221)	$ 1,357	$ 732

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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