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Income Taxes - Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | --- | ---
Deferred income tax liabilities - |  |  |
Property and equipment | $ (205,977) | $ (204,918) |
Goodwill | (48,201) | (43,057) |
Other intangibles | (46,661) | (54,206) |
Book/tax accounting method difference | (45,159) | (27,924) |
Total deferred income tax liabilities | (345,998) | (330,105) |
Deferred income tax assets - |  |  |
Accruals and reserves | 33,357 | 40,619 |
Accrued insurance | 53,163 | 55,169 |
Deferred revenue | 16,259 | 14,243 |
Net operating loss carryforwards | 17,115 | 15,615 |
Other | 20,540 | 13,140 |
Subtotal | 140,434 | 138,786 |
Valuation allowance | (9,344) | (8,783) | (11,400)
Total deferred income tax assets | 131,090 | 130,003 |
Total net deferred income tax liabilities | $ (214,908) | $ (200,102) |

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