Other Comprehensive Income (Loss) (Components of Other Comprehensive Income (Loss)) (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Components of Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), gross total	$ (10,574)	$ (6,045)	$ 6,949
Income tax (expense) benefit related to items of other comprehensive income (loss)	3,996	2,321	(2,653)
Amounts reclassified, net of tax	5,148	2,317	3,483
Changes in fair value, net of taxes	(11,726)	(6,041)	813
Other comprehensive income (loss), total, net of tax	(6,578)	(3,724)	4,296
Interest Rate Swap [Member]
Components of Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified, gross	5,093	4,581	5,641
Changes in fair value, gross	(7,746)	(6,448)	296
Amounts reclassified, tax effect	(1,938)	(1,757)	(2,158)
Changes in fair value, tax effect	2,926	2,478	(108)
Amounts reclassified, net of tax	3,155	2,824	3,483
Changes in fair value, net of taxes	(4,820)	(3,970)	188
Fuel [Member] \| Commodity Contract [Member]
Components of Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified, gross	3,217	(823)
Changes in fair value, gross	(11,138)	(3,355)	1,012
Amounts reclassified, tax effect	(1,224)	316
Changes in fair value, tax effect	4,232	1,284	(387)
Amounts reclassified, net of tax	1,993	(507)
Changes in fair value, net of taxes	$ (6,906)	$ (2,071)	$ 625

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 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 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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