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Reconciliation of Denominator of Net Income Per Share Attributable to Quest Software Incorporation Stockholders - Additional Information (Parenthetical) (Detail) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Earnings Per Share
Common stock outstanding not included in computation of diluted net income per share	2.7	4.8	2.7	2.8

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

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