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Tax Effect of Significant Temporary Differences Representing Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Schedule of Deferred Income Tax Assets and Liabilities [Line Items] |  |
Total deferred tax assets | $ 359,073 | $ 274,973
Total deferred tax liabilities | (706,034) | (921,510)
Net deferred tax liability | (346,961) | (646,537)
Net Operating Loss Carryforwards |  |
Schedule of Deferred Income Tax Assets and Liabilities [Line Items] |  |
Total deferred tax assets | 285,542 | 203,485
Alternative Minimum Tax Credit |  |
Schedule of Deferred Income Tax Assets and Liabilities [Line Items] |  |
Total deferred tax assets | 7,907 | 7,907
Scientific Research and Experimental Development Tax Credit |  |
Schedule of Deferred Income Tax Assets and Liabilities [Line Items] |  |
Total deferred tax assets | 898 |
Workers Compensation Allowance |  |
Schedule of Deferred Income Tax Assets and Liabilities [Line Items] |  |
Total deferred tax assets | 19,662 | 26,157
Expense Associated with Stock Options and Restricted Stock |  |
Schedule of Deferred Income Tax Assets and Liabilities [Line Items] |  |
Total deferred tax assets | 12,338 | 17,116
Federal benefit of state deferred tax liabilities |  |
Schedule of Deferred Income Tax Assets and Liabilities [Line Items] |  |
Total deferred tax assets | 5,660 | 5,310
All Other |  |
Schedule of Deferred Income Tax Assets and Liabilities [Line Items] |  |
Total deferred tax assets | 27,066 | 14,998
Total deferred tax liabilities | (10,923) | (9,538)
Property and equipment basis difference |  |
Schedule of Deferred Income Tax Assets and Liabilities [Line Items] |  |
Total deferred tax liabilities | $ (695,111) | $ (911,972)

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