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Deferred Tax Assets and Liabilities Result from Differences in Timing of Recognition of Certain Income and Expense Items for Tax and Financial Accounting Purposes (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred income tax assets:    
Net operating loss carryforwards $ 150,004us-gaap_DeferredTaxAssetsOperatingLossCarryforwards $ 148,499us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Tax credits 43,804us-gaap_DeferredTaxAssetsTaxCreditCarryforwards 32,231us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
Compensation 24,486us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther 24,902us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther
Deferred revenue 13,486us-gaap_DeferredTaxAssetsDeferredIncome 10,564us-gaap_DeferredTaxAssetsDeferredIncome
Tax basis in investments 5,601us-gaap_DeferredTaxAssetsInvestments 15,536us-gaap_DeferredTaxAssetsInvestments
Other 9,712us-gaap_DeferredTaxAssetsOther 10,153us-gaap_DeferredTaxAssetsOther
Gross deferred income tax assets 247,093us-gaap_DeferredTaxAssetsGross 241,885us-gaap_DeferredTaxAssetsGross
Less: valuation allowance (36,174)us-gaap_DeferredTaxAssetsValuationAllowance (39,749)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred income tax assets 210,919us-gaap_DeferredTaxAssetsNet 202,136us-gaap_DeferredTaxAssetsNet
Deferred income tax liabilities:    
Depreciation and amortization (129,825)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (117,444)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Total deferred income tax liabilities (129,825)us-gaap_DeferredTaxLiabilities (117,444)us-gaap_DeferredTaxLiabilities
Net deferred income taxes 81,094us-gaap_DeferredTaxAssetsLiabilitiesNet 84,692us-gaap_DeferredTaxAssetsLiabilitiesNet
Deferred income taxes / liabilities included in the balance sheet are:    
Deferred income tax asset - current 44,349us-gaap_DeferredTaxAssetsNetCurrent 47,593us-gaap_DeferredTaxAssetsNetCurrent
Deferred income tax asset - noncurrent 50,187us-gaap_DeferredTaxAssetsNetNoncurrent 48,852us-gaap_DeferredTaxAssetsNetNoncurrent
Deferred income tax liability - current (225)us-gaap_DeferredTaxLiabilitiesCurrent (753)us-gaap_DeferredTaxLiabilitiesCurrent
Deferred income tax liability - noncurrent (13,217)us-gaap_DeferredTaxLiabilitiesNoncurrent (11,000)us-gaap_DeferredTaxLiabilitiesNoncurrent
Net deferred income taxes $ 81,094us-gaap_DeferredTaxAssetsLiabilitiesNet $ 84,692us-gaap_DeferredTaxAssetsLiabilitiesNet