Tax Effect of Significant Temporary Differences Representing Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule of Deferred Income Tax Assets and Liabilities [Line Items]
Ending Balance	$ 50,706us-gaap_DeferredTaxAssetsNetCurrent	$ 47,259us-gaap_DeferredTaxAssetsNetCurrent	$ 64,443us-gaap_DeferredTaxAssetsNetCurrent
Net Change	3,447	(17,184)	(92,937)
Beginning Balance	47,259us-gaap_DeferredTaxAssetsNetCurrent	64,443us-gaap_DeferredTaxAssetsNetCurrent	157,380us-gaap_DeferredTaxAssetsNetCurrent
Ending Balance	66,916us-gaap_DeferredTaxAssetsNetNoncurrent	67,201us-gaap_DeferredTaxAssetsNetNoncurrent	63,580us-gaap_DeferredTaxAssetsNetNoncurrent
Net Change	(285)	3,621	1,488
Beginning Balance	67,201us-gaap_DeferredTaxAssetsNetNoncurrent	63,580us-gaap_DeferredTaxAssetsNetNoncurrent	62,092us-gaap_DeferredTaxAssetsNetNoncurrent
Ending Balance	117,622us-gaap_DeferredTaxAssetsNet	114,460us-gaap_DeferredTaxAssetsNet	128,023us-gaap_DeferredTaxAssetsNet
Net Change	3,162	(13,563)	(91,449)
Beginning Balance	114,460us-gaap_DeferredTaxAssetsNet	128,023us-gaap_DeferredTaxAssetsNet	219,472us-gaap_DeferredTaxAssetsNet
Ending Balance	(1,002,576)	(955,065)	(920,882)
Net Change	(47,511)	(34,183)	(72,158)
Beginning Balance	(955,065)	(920,882)	(848,724)
Ending Balance	(1,016,207)us-gaap_DeferredTaxLiabilities	(969,372)us-gaap_DeferredTaxLiabilities	(932,366)us-gaap_DeferredTaxLiabilities
Net Change	(46,835)	(37,006)	(68,987)
Beginning Balance	(969,372)us-gaap_DeferredTaxLiabilities	(932,366)us-gaap_DeferredTaxLiabilities	(863,379)us-gaap_DeferredTaxLiabilities
Ending Balance	(898,585)us-gaap_DeferredTaxAssetsLiabilitiesNet	(854,912)us-gaap_DeferredTaxAssetsLiabilitiesNet	(804,343)us-gaap_DeferredTaxAssetsLiabilitiesNet
Net Change	(43,673)	(50,569)	(160,436)
Beginning Balance	(854,912)us-gaap_DeferredTaxAssetsLiabilitiesNet	(804,343)us-gaap_DeferredTaxAssetsLiabilitiesNet	(643,907)us-gaap_DeferredTaxAssetsLiabilitiesNet
Net Operating Loss Carryforwards
Schedule of Deferred Income Tax Assets and Liabilities [Line Items]
Ending Balance			18,914
Net Change		(18,914)	(95,662)
Beginning Balance		18,914	114,576
Ending Balance	12,464	13,452	11,762
Net Change	(988)	1,690	(6,672)
Beginning Balance	13,452	11,762	18,434
Workers Compensation Allowance
Schedule of Deferred Income Tax Assets and Liabilities [Line Items]
Ending Balance	28,310	27,612	25,078
Net Change	698	2,534	1,074
Beginning Balance	27,612	25,078	24,004
Other
Schedule of Deferred Income Tax Assets and Liabilities [Line Items]
Ending Balance	22,396	19,647	20,451
Net Change	2,749	(804)	1,651
Beginning Balance	19,647	20,451	18,800
Ending Balance	16,047	14,703	15,124
Net Change	1,344	(421)	4,454
Beginning Balance	14,703	15,124	10,670
Ending Balance	(13,631)	(14,307)	(11,484)
Net Change	676	(2,823)	3,171
Beginning Balance	(14,307)	(11,484)	(14,655)
Ending Balance	(15,623)	(15,471)	(15,285)
Net Change	(152)	(186)	(2,384)
Beginning Balance	(15,471)	(15,285)	(12,901)
Expense associated with employee stock options
Schedule of Deferred Income Tax Assets and Liabilities [Line Items]
Ending Balance	14,386	16,208	14,672
Net Change	(1,822)	1,536	1,944
Beginning Balance	16,208	14,672	12,728
Federal benefit of state deferred tax liabilities
Schedule of Deferred Income Tax Assets and Liabilities [Line Items]
Ending Balance	24,019	22,838	22,022
Net Change	1,181	816	1,762
Beginning Balance	22,838	22,022	20,260
Property and equipment basis difference
Schedule of Deferred Income Tax Assets and Liabilities [Line Items]
Ending Balance	(986,953)	(939,594)	(905,597)
Net Change	(47,359)	(33,997)	(69,774)
Beginning Balance	$ (939,594)	$ (905,597)	$ (835,823)

Deferred Tax Assets (Liabilities), Net, Increase (Decrease)

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