Other Comprehensive Income (Loss) (Components of Other Comprehensive Income (Loss)) (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Components of Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), gross total	$ 1,088	$ (1,162)	$ (3,251)	$ (996)
Income tax (expense) benefit related to items of other comprehensive income (loss)	(417)	446	1,247	385
Amounts reclassified, net of tax			2,074	818
Changes in fair value, net of tax			(4,078)	(1,429)
Other comprehensive income (loss), total, net of tax	671	(716)	(2,004)	(611)
Interest Rate Swap [Member]
Components of Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified, gross	1,037	886	2,072	1,954
Changes in fair value, gross	1,036	(2,210)	(4,437)	(2,504)
Amounts reclassified, tax effect	(398)	(340)	(795)	(749)
Changes in fair value, tax effect	(397)	848	1,702	965
Amounts reclassified, net of tax	639	546	1,277	1,205
Changes in fair value, net of tax	639	(1,362)	(2,735)	(1,539)
Fuel [Member] \| Commodity Contract [Member]
Components of Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified, gross	677	(304)	1,292	(627)
Changes in fair value, gross	(1,662)	466	(2,178)	181
Amounts reclassified, tax effect	(260)	117	(495)	240
Changes in fair value, tax effect	638	(179)	835	(71)
Amounts reclassified, net of tax	417	(187)	797	(387)
Changes in fair value, net of tax	$ (1,024)	$ 287	$ (1,343)	$ 110

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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Amount after 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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Amount of tax expense (benefit) 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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Amount before 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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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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