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Income Taxes - Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Deferred income tax liabilities: |  |  |
Property and equipment | $ (161,491) | $ (214,902) |
Goodwill | (49,407) | (83,097) |
Other intangibles | (26,676) | (33,566) |
Customer holdbacks | (36,218) | (16,424) |
Other book/tax accounting method differences | (15,154) | (24,817) |
Total deferred income tax liabilities | (288,946) | (372,806) |
Deferred income tax assets: |  |  |
Accruals and reserves | 21,419 | 21,681 |
Accrued insurance | 0 | 79,630 |
Stock and incentive compensation and pension withdrawal liabilities | 17,676 | 58,744 |
Net operating loss carryforwards | 62,925 | 37,362 |
Tax credits | 48,516 | 1,613 |
Other | 4,747 | 5,933 |
Subtotal | 155,283 | 204,963 |
Valuation allowance | (19,328) | (14,991) | $ (16,100)
Total deferred income tax assets | 135,955 | 189,972 |
Total net deferred income tax liabilities | $ (152,991) | $ (182,834) |

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