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Income Taxes - Deferred Income Taxes Related to Temporary Differences between Tax Bases of Assets and Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred tax liabilities:    
Accelerated depreciation $ 272,496us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment $ 257,537us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Prepaid costs currently deductible 6,358us-gaap_DeferredTaxLiabilitiesPrepaidExpenses 4,794us-gaap_DeferredTaxLiabilitiesPrepaidExpenses
Other 4,404us-gaap_DeferredTaxLiabilitiesOther 3,242us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities 283,258us-gaap_DeferredIncomeTaxLiabilities 265,573us-gaap_DeferredIncomeTaxLiabilities
Deferred tax assets:    
Accrued costs not yet deductible 7,463us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther 6,638us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther
Allowance for doubtful accounts 788us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts 775us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
Net operating loss carry forwards and credits 302us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 2,736us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Deferred revenues 1,132us-gaap_DeferredTaxAssetsDeferredIncome 305us-gaap_DeferredTaxAssetsDeferredIncome
Share-based compensation 4,671us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 5,862us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Total deferred tax assets 14,356us-gaap_DeferredTaxAssetsGross 16,316us-gaap_DeferredTaxAssetsGross
Deferred income taxes, net $ 268,902us-gaap_DeferredTaxLiabilities $ 249,257us-gaap_DeferredTaxLiabilities