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Tax Effect of Significant Temporary Differences Representing Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Schedule of Deferred Income Tax Assets and Liabilities [Line Items] |  |  |
Ending Balance | $ 47,259 | $ 64,443 | $ 157,380
Net Change | (17,184) | (92,937) | 115,436
Beginning Balance | 64,443 | 157,380 | 41,944
Ending Balance | 67,201 | 63,580 | 62,092
Net Change | 3,621 | 1,488 | 15,189
Beginning Balance | 63,580 | 62,092 | 46,903
Ending Balance | 114,460 | 128,023 | 219,472
Net Change | (13,563) | (91,449) | 130,625
Beginning Balance | 128,023 | 219,472 | 88,847
Ending Balance | (955,065) | (920,882) | (848,724)
Net Change | (34,183) | (72,158) | (290,399)
Beginning Balance | (920,882) | (848,724) | (558,325)
Ending Balance | (969,372) | (932,366) | (863,379)
Net Change | (37,006) | (68,987) | (289,925)
Beginning Balance | (932,366) | (863,379) | (573,454)
Ending Balance | (854,912) | (804,343) | (643,907)
Net Change | (50,569) | (160,436) | (159,300)
Beginning Balance | (804,343) | (643,907) | (484,607)
Net Operating Loss Carryforwards |  |  |
Schedule of Deferred Income Tax Assets and Liabilities [Line Items] |  |  |
Ending Balance |  | 18,914 | 114,576
Net Change | (18,914) | (95,662) | 114,576
Beginning Balance | 18,914 | 114,576 |
Ending Balance | 13,452 | 11,762 | 18,434
Net Change | 1,690 | (6,672) | 11,969
Beginning Balance | 11,762 | 18,434 | 6,465
Workers Compensation Allowance |  |  |
Schedule of Deferred Income Tax Assets and Liabilities [Line Items] |  |  |
Ending Balance | 27,612 | 25,078 | 24,004
Net Change | 2,534 | 1,074 | 714
Beginning Balance | 25,078 | 24,004 | 23,290
Other |  |  |
Schedule of Deferred Income Tax Assets and Liabilities [Line Items] |  |  |
Ending Balance | 19,647 | 20,451 | 18,800
Net Change | (804) | 1,651 | 146
Beginning Balance | 20,451 | 18,800 | 18,654
Ending Balance | 14,703 | 15,124 | 10,670
Net Change | (421) | 4,454 | (5,361)
Beginning Balance | 15,124 | 10,670 | 16,031
Ending Balance | (14,307) | (11,484) | (14,655)
Net Change | (2,823) | 3,171 | 474
Beginning Balance | (11,484) | (14,655) | (15,129)
Ending Balance | (15,471) | (15,285) | (12,901)
Net Change | (186) | (2,384) | (1,231)
Beginning Balance | (15,285) | (12,901) | (11,670)
Expense associated with employee stock options |  |  |
Schedule of Deferred Income Tax Assets and Liabilities [Line Items] |  |  |
Ending Balance | 16,208 | 14,672 | 12,728
Net Change | 1,536 | 1,944 | 1,476
Beginning Balance | 14,672 | 12,728 | 11,252
Federal benefit of state deferred tax liabilities |  |  |
Schedule of Deferred Income Tax Assets and Liabilities [Line Items] |  |  |
Ending Balance | 22,838 | 22,022 | 20,260
Net Change | 816 | 1,762 | 7,105
Beginning Balance | 22,022 | 20,260 | 13,155
Property and equipment basis difference |  |  |
Schedule of Deferred Income Tax Assets and Liabilities [Line Items] |  |  |
Ending Balance | (939,594) | (905,597) | (835,823)
Net Change | (33,997) | (69,774) | (289,168)
Beginning Balance | $ (905,597) | $ (835,823) | $ (546,655)

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