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Income Taxes - Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | --- | ---
Deferred income tax liabilities - |  |  |
Property and equipment | $ (218,739) | $ (205,977) |
Goodwill | (58,643) | (48,201) |
Other intangibles | (42,604) | (46,661) |
Book/tax accounting method difference | (50,764) | (54,768) |
Total deferred income tax liabilities | (370,750) | (355,607) |
Deferred income tax assets - |  |  |
Accruals and reserves | 64,944 | 42,966 |
Accrued insurance | 59,640 | 53,163 |
Deferred revenue | 15,336 | 16,259 |
Net operating loss carryforwards | 20,828 | 17,115 |
Other | 26,229 | 20,540 |
Subtotal | 186,977 | 150,043 |
Valuation allowance | (15,644) | (9,344) | (8,800)
Total deferred income tax assets | 171,333 | 140,699 |
Total net deferred income tax liabilities | $ (199,417) | $ (214,908) |

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