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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, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Schedule of Deferred Income Tax Assets and Liabilities [Line Items] |  |  |
Ending Balance | $ 64,443 | $ 157,380 | $ 41,944
Net Change | (92,937) | 115,436 | (2,296)
Beginning Balance | 157,380 | 41,944 | 44,240
Ending Balance | 63,580 | 62,092 | 46,903
Net Change | 1,488 | 15,189 | 4,485
Beginning Balance | 62,092 | 46,903 | 42,418
Deferred Tax Ending Balance | 128,023 | 219,472 | 88,847
Net Change | (91,449) | 130,625 | 2,189
Beginning Balance | 219,472 | 88,847 | 86,658
Ending Balance | (920,882) | (848,724) | (558,325)
Net Change | (72,158) | (290,399) | (134,251)
Beginning Balance | (848,724) | (558,325) | (424,074)
Ending Balance | (932,366) | (863,379) | (573,454)
Net Change | (68,987) | (289,925) | (138,017)
Beginning Balance | (863,379) | (573,454) | (435,437)
Ending Balance | (804,343) | (643,907) | (484,607)
Net Change | (160,436) | (159,300) | (135,828)
Beginning Balance | (643,907) | (484,607) | (348,779)
Net Operating Loss Carryforwards |  |  |
Schedule of Deferred Income Tax Assets and Liabilities [Line Items] |  |  |
Ending Balance | 18,914 | 114,576 |
Net Change | (95,662) | 114,576 |
Beginning Balance | 114,576 |  |
Ending Balance | 11,762 | 18,434 | 6,465
Net Change | (6,672) | 11,969 | 1,593
Beginning Balance | 18,434 | 6,465 | 4,872
Workers Compensation Allowance |  |  |
Schedule of Deferred Income Tax Assets and Liabilities [Line Items] |  |  |
Ending Balance | 25,078 | 24,004 | 23,290
Net Change | 1,074 | 714 | (1,334)
Beginning Balance | 24,004 | 23,290 | 24,624
Other |  |  |
Schedule of Deferred Income Tax Assets and Liabilities [Line Items] |  |  |
Ending Balance | 20,451 | 18,800 | 18,654
Net Change | 1,651 | 146 | (962)
Beginning Balance | 18,800 | 18,654 | 19,616
Ending Balance | 15,124 | 10,670 | 16,031
Net Change | 4,454 | (5,361) | 6,546
Beginning Balance | 10,670 | 16,031 | 9,485
Ending Balance | (11,484) | (14,655) | (15,129)
Net Change | 3,171 | 474 | (3,766)
Beginning Balance | (14,655) | (15,129) | (11,363)
Ending Balance | (15,285) | (12,901) | (11,670)
Net Change | (2,384) | (1,231) | (709)
Beginning Balance | (12,901) | (11,670) | (10,961)
Expense associated with employee stock options |  |  |
Schedule of Deferred Income Tax Assets and Liabilities [Line Items] |  |  |
Ending Balance | 14,672 | 12,728 | 11,252
Net Change | 1,944 | 1,476 | 2,123
Beginning Balance | 12,728 | 11,252 | 9,129
Federal benefit of foreign deferred tax liabilities |  |  |
Schedule of Deferred Income Tax Assets and Liabilities [Line Items] |  |  |
Ending Balance |  |  |
Net Change |  |  | (9,160)
Beginning Balance |  |  | 9,160
Federal benefit of state deferred tax liabilities |  |  |
Schedule of Deferred Income Tax Assets and Liabilities [Line Items] |  |  |
Ending Balance | 22,022 | 20,260 | 13,155
Net Change | 1,762 | 7,105 | 3,383
Beginning Balance | 20,260 | 13,155 | 9,772
Property and equipment basis difference |  |  |
Schedule of Deferred Income Tax Assets and Liabilities [Line Items] |  |  |
Ending Balance | (905,597) | (835,823) | (546,655)
Net Change | (69,774) | (289,168) | (133,542)
Beginning Balance | $ (835,823) | $ (546,655) | $ (413,113)

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