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Income Taxes - Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Deferred income tax liabilities: |  |  |
Property and equipment | $ (214,902) | $ (189,793) |
Goodwill | (83,097) | (69,059) |
Other intangibles | (33,566) | (36,565) |
Other book/tax accounting method differences | (41,241) | (61,095) |
Total deferred income tax liabilities | (372,806) | (356,512) |
Deferred income tax assets: |  |  |
Accruals and reserves | 21,681 | 25,070 |
Accrued insurance | 79,630 | 75,591 |
Stock and incentive compensation and pension withdrawal liabilities | 58,744 | 52,009 |
Net operating loss carryforwards | 37,362 | 27,255 |
Other | 7,546 | 10,894 |
Subtotal | 204,963 | 190,819 |
Valuation allowance | (14,991) | (16,141) | $ (13,000)
Total deferred income tax assets | 189,972 | 174,678 |
Total net deferred income tax liabilities | $ (182,834) | $ (181,834) |

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