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Components of Income Tax (Benefit) Expense (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Components Of Income Tax Expense Benefit [Line Items]      
Current, Federal $ 1,574us-gaap_CurrentFederalTaxExpenseBenefit $ 854us-gaap_CurrentFederalTaxExpenseBenefit $ 5,797us-gaap_CurrentFederalTaxExpenseBenefit
Current, State 111us-gaap_CurrentStateAndLocalTaxExpenseBenefit 772us-gaap_CurrentStateAndLocalTaxExpenseBenefit 654us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Current, Foreign 21,459us-gaap_CurrentForeignTaxExpenseBenefit 12,937us-gaap_CurrentForeignTaxExpenseBenefit 11,183us-gaap_CurrentForeignTaxExpenseBenefit
Current, Total 23,144us-gaap_CurrentIncomeTaxExpenseBenefit 14,563us-gaap_CurrentIncomeTaxExpenseBenefit 17,634us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred (net of valuation allowance), Federal (41,484)us-gaap_DeferredFederalIncomeTaxExpenseBenefit 6,003us-gaap_DeferredFederalIncomeTaxExpenseBenefit 11,165us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Deferred (net of valuation allowance), State (1,545)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit (650)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 168us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Deferred (net of valuation allowance), Foreign (1,687)us-gaap_DeferredForeignIncomeTaxExpenseBenefit 1,753us-gaap_DeferredForeignIncomeTaxExpenseBenefit 1,914us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Deferred (net of valuation allowance), Total (44,716)entg_DeferredTaxExpenseBenefitNetOfValuationAllowance 7,106entg_DeferredTaxExpenseBenefitNetOfValuationAllowance 13,247entg_DeferredTaxExpenseBenefitNetOfValuationAllowance
Income tax (benefit) expense $ (21,572)us-gaap_IncomeTaxExpenseBenefit $ 21,669us-gaap_IncomeTaxExpenseBenefit $ 30,881us-gaap_IncomeTaxExpenseBenefit