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Income Taxes - Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | ---
Deferred income tax liabilities: |  |  |
Property and equipment | $ (189,793) | $ (185,007) |
Goodwill | (69,059) | (70,832) |
Other intangibles | (36,565) | (48,344) |
Other book/tax accounting method differences | (61,095) | (63,819) |
Total deferred income tax liabilities | (356,512) | (368,002) |
Deferred income tax assets: |  |  |
Accruals and reserves | 25,070 | 20,835 |
Accrued insurance | 75,591 | 64,745 |
Stock and incentive compensation and pension withdrawal liabilities | 52,009 | 53,155 |
Net operating loss carryforwards | 27,255 | 19,353 |
Other | 10,894 | 10,194 |
Subtotal | 190,819 | 168,282 |
Valuation allowance | (16,141) | (13,028) | $ (13,300)
Total deferred income tax assets | 174,678 | 155,254 |
Total net deferred income tax liabilities | $ (181,834) | $ (212,748) |

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