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v2.4.1.9

Income Taxes - Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
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Deferred income tax liabilities - |  |  |
Property and equipment | $ (255,084)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment | $ (218,739)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment |
Goodwill | (72,030)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill | (58,643)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill |
Other intangibles | (53,599)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets | (42,604)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets |
Book/tax accounting method difference | (63,989)us-gaap_DeferredTaxLiabilitiesOther | (50,764)us-gaap_DeferredTaxLiabilitiesOther |
Total deferred income tax liabilities | (444,702)us-gaap_DeferredIncomeTaxLiabilities | (370,750)us-gaap_DeferredIncomeTaxLiabilities |
Deferred income tax assets - |  |  |
Accruals and reserves | 22,885 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals | 22,642 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals |
Accrued insurance | 64,773 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsSelfInsurance | 59,640 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsSelfInsurance |
Deferred revenue | 16,575 us-gaap_DeferredTaxAssetsDeferredIncome | 15,336 us-gaap_DeferredTaxAssetsDeferredIncome |
Stock and incentive compensation and pension withdrawal liabilities | 53,610 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation | 57,674 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation |
Net operating loss carryforwards | 21,511 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | 20,828 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards |
Other | 10,678 us-gaap_DeferredTaxAssetsOther | 10,857 us-gaap_DeferredTaxAssetsOther |
Subtotal | 190,032 us-gaap_DeferredTaxAssetsGross | 186,977 us-gaap_DeferredTaxAssetsGross |
Valuation allowance | (15,186)us-gaap_DeferredTaxAssetsValuationAllowance | (15,644)us-gaap_DeferredTaxAssetsValuationAllowance | (9,300)us-gaap_DeferredTaxAssetsValuationAllowance
Total deferred income tax assets | 174,846 us-gaap_DeferredTaxAssetsNet | 171,333 us-gaap_DeferredTaxAssetsNet |
Total net deferred income tax liabilities | $ (269,856)us-gaap_DeferredTaxLiabilities | $ (199,417)us-gaap_DeferredTaxLiabilities |

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