Other Comprehensive Income (Loss) (Components of Other Comprehensive Income (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]
Other comprehensive income (loss), gross total	$ (4,339)	$ 166
Income tax (expense) benefit related to items of other comprehensive income (loss)	1,664	(61)
Amounts reclassified, net of tax	1,017	459
Changes in fair value, net of tax	(3,692)	(354)
Other comprehensive income (loss), total, net of tax	(2,675)	105
Interest Rate Swap [Member]
Components of Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified, gross	1,036	1,068
Changes in fair value, gross	(5,473)	(294)
Amounts reclassified, tax effect	(398)	(410)
Changes in fair value, tax effect	2,099	118
Amounts reclassified, net of tax	638	658
Changes in fair value, net of tax	(3,374)	(176)
Fuel [Member] \| Commodity Contract [Member]
Components of Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified, gross	614	(323)
Changes in fair value, gross	(516)	(285)
Amounts reclassified, tax effect	(235)	124
Changes in fair value, tax effect	198	107
Amounts reclassified, net of tax	379	(199)
Changes in fair value, net of tax	$ (318)	$ (178)

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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