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v2.4.1.9

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
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Deferred tax liabilities: |  |
Accelerated depreciation | $ 272,496 us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment | $ 257,537 us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Prepaid costs currently deductible | 6,358 us-gaap_DeferredTaxLiabilitiesPrepaidExpenses | 4,794 us-gaap_DeferredTaxLiabilitiesPrepaidExpenses
Other | 4,404 us-gaap_DeferredTaxLiabilitiesOther | 3,242 us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities | 283,258 us-gaap_DeferredIncomeTaxLiabilities | 265,573 us-gaap_DeferredIncomeTaxLiabilities
Deferred tax assets: |  |
Accrued costs not yet deductible | 7,463 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther | 6,638 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther
Allowance for doubtful accounts | 788 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts | 775 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
Net operating loss carry forwards and credits | 302 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | 2,736 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Deferred revenues | 1,132 us-gaap_DeferredTaxAssetsDeferredIncome | 305 us-gaap_DeferredTaxAssetsDeferredIncome
Share-based compensation | 4,671 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost | 5,862 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Total deferred tax assets | 14,356 us-gaap_DeferredTaxAssetsGross | 16,316 us-gaap_DeferredTaxAssetsGross
Deferred income taxes, net | $ 268,902 us-gaap_DeferredTaxLiabilities | $ 249,257 us-gaap_DeferredTaxLiabilities

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- Definition Amount of deferred tax liability attributable to taxable temporary differences net of deferred tax asset attributable to deductible temporary differences and carryforwards after valuation allowances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e31931-109318 + Details
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