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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, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Schedule of Deferred Income Tax Assets and Liabilities [Line Items] |  |  |
Ending Balance | $ 157,380 | $ 41,944 | $ 44,240
Net Change | 115,436 | (2,296) | (4,095)
Beginning Balance | 41,944 | 44,240 | 48,335
Ending Balance | 62,092 | 46,903 | 42,418
Net Change | 15,189 | 4,485 | 13,938
Beginning Balance | 46,903 | 42,418 | 28,480
Ending Balance | 219,472 | 88,847 | 86,658
Net Change | 130,625 | 2,189 | 9,843
Beginning Balance | 88,847 | 86,658 | 76,815
Ending Balance | (848,724) | (558,325) | (424,074)
Net Change | (290,399) | (134,251) | (117,877)
Beginning Balance | (558,325) | (424,074) | (306,197)
Ending Balance | (863,379) | (573,454) | (435,437)
Net Change | (289,925) | (138,017) | (116,833)
Beginning Balance | (573,454) | (435,437) | (318,604)
Ending Balance | (643,907) | (484,607) | (348,779)
Net Change | (159,300) | (135,828) | (106,990)
Beginning Balance | (484,607) | (348,779) | (241,789)
Net Operating Loss Carryforwards |  |  |
Schedule of Deferred Income Tax Assets and Liabilities [Line Items] |  |  |
Ending Balance | 114,576 |  |
Net Change | 114,576 |  |
Ending Balance | 18,434 | 6,465 | 4,872
Net Change | 11,969 | 1,593 | 4,872
Beginning Balance | 6,465 | 4,872 |
Workers Compensation Allowance |  |  |
Schedule of Deferred Income Tax Assets and Liabilities [Line Items] |  |  |
Ending Balance | 24,004 | 23,290 | 24,624
Net Change | 714 | (1,334) | (1,360)
Beginning Balance | 23,290 | 24,624 | 25,984
Other |  |  |
Schedule of Deferred Income Tax Assets and Liabilities [Line Items] |  |  |
Ending Balance | 18,800 | 18,654 | 19,616
Net Change | 146 | (962) | (2,735)
Beginning Balance | 18,654 | 19,616 | 22,351
Ending Balance | 10,670 | 16,031 | 9,485
Net Change | (5,361) | 6,546 | 4,120
Beginning Balance | 16,031 | 9,485 | 5,365
Ending Balance | (14,655) | (15,129) | (11,363)
Net Change | 474 | (3,766) | 1,044
Beginning Balance | (15,129) | (11,363) | (12,407)
Ending Balance | (12,901) | (11,670) | (10,961)
Net Change | (1,231) | (709) | (7,091)
Beginning Balance | (11,670) | (10,961) | (3,870)
Federal benefit of foreign deferred tax liabilities |  |  |
Schedule of Deferred Income Tax Assets and Liabilities [Line Items] |  |  |
Ending Balance |  |  | 9,160
Net Change |  | (9,160) | (256)
Beginning Balance |  | 9,160 | 9,416
Federal benefit of state deferred tax liabilities |  |  |
Schedule of Deferred Income Tax Assets and Liabilities [Line Items] |  |  |
Ending Balance | 20,260 | 13,155 | 9,772
Net Change | 7,105 | 3,383 | 2,702
Beginning Balance | 13,155 | 9,772 | 7,070
Expense associated with employee stock options |  |  |
Schedule of Deferred Income Tax Assets and Liabilities [Line Items] |  |  |
Ending Balance | 12,728 | 11,252 | 9,129
Net Change | 1,476 | 2,123 | 2,500
Beginning Balance | 11,252 | 9,129 | 6,629
Property and equipment basis difference |  |  |
Schedule of Deferred Income Tax Assets and Liabilities [Line Items] |  |  |
Ending Balance | (835,823) | (546,655) | (413,113)
Net Change | (289,168) | (133,542) | (110,786)
Beginning Balance | $ (546,655) | $ (413,113) | $ (302,327)

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- Definition For entities that net deferred tax assets and tax liabilities, represents the unclassified net amount of deferred tax assets and liabilities as of the balance sheet date, which result from applying the applicable enacted tax rate to net temporary differences and carryforwards pertaining to assets or liabilities. A temporary difference is a difference between the tax basis of an asset or liability and its carrying amount in the financial statements prepared in accordance with generally accepted accounting principles that will reverse in ensuing periods. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 42, 43 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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- Definition The aggregate tax effects as of the balance sheet date of all future tax deductions arising from temporary differences between tax basis and generally accepted accounting principles basis recognition of assets, liabilities, revenues and expenses, which can only be deducted for tax purposes when permitted under enacted tax laws; net of deducting the allocated valuation allowance, if any, to reduce such amount to net realizable value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 43 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b),(c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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- Definition The current portion of the aggregate tax effects as of the balance sheet date of all future tax deductions arising from temporary differences between tax basis and generally accepted accounting principles basis recognition of assets, liabilities, revenues and expenses, which can only be deducted for tax purposes when permitted under enacted tax laws; after deducting the allocated valuation allowance, if any, to reduce such amount to net realizable value. Deferred tax liabilities and assets are classified as current or noncurrent based on the classification of the related asset or liability for financial reporting. A deferred tax liability or asset that is not related to an asset or liability for financial reporting, including deferred tax assets related to carryforwards, are classified according to the expected reversal date of the temporary difference. An unrecognized tax benefit that is directly related to a position taken in a tax year that results in a net operating loss carryforward is presented as a reduction of the related deferred tax asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6907571&loc=d3e31928-109318 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 41, 42, 43 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6907571&loc=d3e31958-109318 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6907571&loc=d3e31917-109318 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907571&loc=d3e31931-109318 + Details
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