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Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Deferred tax assets:      
Goodwill and other intangibles $ 53,869us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets $ 59,828us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets  
Net operating losses 17,439us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 16,489us-gaap_DeferredTaxAssetsOperatingLossCarryforwards  
Foreign tax credits 13,106us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign 12,651us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign  
Accruals 7,311us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther 10,243us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther  
Accounts receivable 6,206us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts 6,389us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts  
Stock-based compensation 3,137us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 2,881us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost  
Inventories 2,216us-gaap_DeferredTaxAssetsInventory 1,837us-gaap_DeferredTaxAssetsInventory  
Deferred revenue 321us-gaap_DeferredTaxAssetsDeferredIncome 567us-gaap_DeferredTaxAssetsDeferredIncome  
Other 1,307us-gaap_DeferredTaxAssetsOther 320us-gaap_DeferredTaxAssetsOther  
Gross deferred tax assets 104,912us-gaap_DeferredTaxAssetsGross 111,205us-gaap_DeferredTaxAssetsGross  
Valuation allowances (28,709)us-gaap_DeferredTaxAssetsValuationAllowance (24,508)us-gaap_DeferredTaxAssetsValuationAllowance (20,176)us-gaap_DeferredTaxAssetsValuationAllowance
Total deferred tax assets 76,203us-gaap_DeferredTaxAssetsNet 86,697us-gaap_DeferredTaxAssetsNet  
Deferred tax liabilities:      
Property and equipment (4,933)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (11,803)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment  
Prepaid expenses (205)us-gaap_DeferredTaxLiabilitiesPrepaidExpenses (250)us-gaap_DeferredTaxLiabilitiesPrepaidExpenses  
Total deferred tax liabilities (5,138)us-gaap_DeferredTaxLiabilities (12,053)us-gaap_DeferredTaxLiabilities  
Net deferred tax assets $ 71,065us-gaap_DeferredTaxAssetsLiabilitiesNet $ 74,644us-gaap_DeferredTaxAssetsLiabilitiesNet