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Tax Effect of Significant Temporary Differences Representing Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Schedule of Deferred Income Tax Assets and Liabilities [Line Items] |  |
Deferred tax assets, Current | $ 47,148 | $ 77,926
Deferred tax assets, Non-current | 263,296 | 137,031
Allowance to reduce deferred tax asset to expected realizable value |  | (603)
Total deferred tax assets | 310,444 | 214,354
Deferred tax liabilities, Non-current | (946,272) | (1,000,261)
Total deferred tax liabilities | (956,981) | (1,013,066)
Net deferred tax liability | (646,537) | (798,712)
Net Operating Loss Carryforwards |  |
Schedule of Deferred Income Tax Assets and Liabilities [Line Items] |  |
Deferred tax assets, Current | 4,702 | 27,887
Deferred tax assets, Non-current | 198,783 | 77,514
Workers Compensation Allowance |  |
Schedule of Deferred Income Tax Assets and Liabilities [Line Items] |  |
Deferred tax assets, Current | 25,736 | 28,734
Other |  |
Schedule of Deferred Income Tax Assets and Liabilities [Line Items] |  |
Deferred tax assets, Current | 16,710 | 21,305
Deferred tax assets, Non-current | 19,137 | 20,441
Deferred tax liabilities, Current | (10,709) | (12,805)
Deferred tax liabilities, Non-current | (16,789) | (13,339)
AMT Credit |  |
Schedule of Deferred Income Tax Assets and Liabilities [Line Items] |  |
Deferred tax assets, Non-current | 7,907 |
Expense associated with employee stock options |  |
Schedule of Deferred Income Tax Assets and Liabilities [Line Items] |  |
Deferred tax assets, Non-current | 14,443 | 14,591
Federal benefit of state deferred tax liabilities |  |
Schedule of Deferred Income Tax Assets and Liabilities [Line Items] |  |
Deferred tax assets, Non-current | 23,026 | 24,485
Property and equipment basis difference |  |
Schedule of Deferred Income Tax Assets and Liabilities [Line Items] |  |
Deferred tax liabilities, Non-current | $ (929,483) | $ (986,922)

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- Definition Amount of deferred tax liability attributable to taxable temporary differences. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(15)(b)(2)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(15)(2)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Liability -URI http://asc.fasb.org/extlink&oid=6510232 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(26)(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(26)(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319 + Details
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