Other Comprehensive Income (Loss) (Components of Other Comprehensive Income (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]
Other comprehensive income (loss), gross total	$ (1,162)	$ 2,720	$ (996)	$ 4,651
Income tax (expense) benefit related to items of other comprehensive income	446	(1,040)	385	(1,774)
Amounts reclassified, net of tax			818	1,716
Changes in fair value, net of taxes			(1,429)	1,161
Other comprehensive income (loss), total, net of tax	(716)	1,680	(611)	2,877
Interest Rate Swap [Member]
Components of Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified, gross	886	1,400	1,954	2,779
Changes in fair value, gross	(2,210)	1,863	(2,504)	1,824
Amounts reclassified, tax effect	(340)	(536)	(749)	(1,063)
Changes in fair value, tax effect	848	(712)	965	(692)
Amounts reclassified, net of tax	546	864	1,205	1,716
Changes in fair value, net of taxes	(1,362)	1,151	(1,539)	1,132
Fuel [Member] \| Commodity Contract [Member]
Components of Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified, gross	(304)		(627)
Changes in fair value, gross	466	(543)	181	48
Amounts reclassified, tax effect	117		240
Changes in fair value, tax effect	(179)	208	(71)	(19)
Amounts reclassified, net of tax	(187)		(387)
Changes in fair value, net of taxes	$ 287	$ (335)	$ 110	$ 29

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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Amount before tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).

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