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Cash Received from Exercise of Stock Options and Employee Contribution to ESPP (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Exercise of stock options and employee contributions to the ESPP $ 3,117entg_ProceedsfromexerciseofstockoptionsandESPP $ 7,685entg_ProceedsfromexerciseofstockoptionsandESPP $ 7,431entg_ProceedsfromexerciseofstockoptionsandESPP