Other Comprehensive Income (Loss) (Components of Other Comprehensive Income (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]
Other comprehensive income (loss), gross total	$ (6,045)	$ 6,949	$ (4,363)
Income tax (expense) benefit related to items of other comprehensive income	2,321	(2,653)	1,678
Amounts reclassified, net of tax	2,317	3,483	481
Changes in fair value, net of taxes	(6,041)	813	(3,166)
Other comprehensive income (loss), total, net of tax	(3,724)	4,296	(2,685)
Interest Rate Swap [Member]
Components of Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified, gross	4,581	5,641	5,289
Changes in fair value, gross	(6,448)	296	(7,333)
Amounts reclassified, tax effect	(1,757)	(2,158)	(2,010)
Changes in fair value, tax effect	2,478	(108)	2,809
Amounts reclassified, net of tax	2,824	3,483	3,279
Changes in fair value, net of taxes	(3,970)	188	(4,524)
Fuel [Member] \| Commodity Contract [Member]
Components of Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified, gross	(823)		(4,513)
Changes in fair value, gross	(3,355)	1,012	2,194
Amounts reclassified, tax effect	316		1,715
Changes in fair value, tax effect	1,284	(387)	(836)
Amounts reclassified, net of tax	(507)		(2,798)
Changes in fair value, net of taxes	$ (2,071)	$ 625	$ 1,358

Amount before tax, after reclassification adjustments, 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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