Short - Term Investment (Detail) (Commercial Paper, USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Commercial Paper
Schedule of Available-for-sale Securities [Line Items]
Cost basis	$ 19,999
Gross unrealized gains	0
Gross unrealized losses	(4)
Fair value	$ 19,995

This item represents the gross unrealized losses for securities which are categorized neither as held-to-maturity nor trading securities. Such gross unrealized losses are the excess of the carrying value of the Available-for-sale Securities over their fair value as of the reporting date. Such gross unrealized losses are included in other comprehensive income in the statement of shareholders' equity, unless the Available-for-sale Security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. Recognized in earnings is all or a portion of the unrealized holding loss, during the period of the hedge, of an Available-for-sale Security that is designated as being hedged in a fair value hedge, other than temporary declines in fair value below cost basis of equity securities, and debt securities which an other than temporary decline in fair value is due to credit losses or which the entity intends to sell or it is more likely than not that the entity will be required to sell the security before recovery of its amortized cost basis.}{

No definition available.

Name:	entg_GrossUnrealizedLossesAvailableforsaleSecurities
Namespace Prefix:	entg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant