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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
	Mar. 31, 2015	Mar. 31, 2014
Components of Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ (5,593)	$ (1,869)
Amounts reclassified into earnings	1,017	459
Changes in fair value	(3,692)	(354)
Ending balance	(8,268)	(1,764)
Interest Rate Swap [Member]
Components of Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(4,372)	(3,226)
Amounts reclassified into earnings	638	658
Changes in fair value	(3,374)	(176)
Ending balance	(7,108)	(2,744)
Fuel [Member] \| Commodity Contract [Member]
Components of Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(1,221)	1,357
Amounts reclassified into earnings	379	(199)
Changes in fair value	(318)	(178)
Ending balance	$ (1,160)	$ 980

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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