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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		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Components of Other Comprehensive Income (Loss) [Line Items]
Beginning balance			$ (1,869)
Amounts reclassified into earnings			1,496	2,595
Changes in fair value			(1,567)	623
Ending balance	(1,940)		(1,940)
Interest Rate Swap [Member]
Components of Other Comprehensive Income (Loss) [Line Items]
Beginning balance			(3,226)
Amounts reclassified into earnings	809	879	2,014	2,595
Changes in fair value	597	(809)	(942)	323
Ending balance	(2,154)		(2,154)
Fuel [Member] \| Commodity Contract [Member]
Components of Other Comprehensive Income (Loss) [Line Items]
Beginning balance			1,357
Amounts reclassified into earnings	(132)		(518)
Changes in fair value	(735)	271	(625)	300
Ending balance	$ 214		$ 214

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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