Net Income Per Share Attributable To Quest Software Inc. Stockholders (Reconciliation Of Denominator Of Net Income Per Share Attributable To Quest Software, Inc. Stockholders) (Details)	3 Months Ended
	Mar. 31, 2012		Mar. 31, 2011
Net Income Per Share Attributable To Quest Software Inc. Stockholders [Abstract]
Shares used in computing basic net income per share	83,424,000		92,303,000
Dilutive effect of stock options and restricted stock units	1,678,000	[1]	2,809,000	[1]
Shares used in computing diluted net income per share	85,102,000		95,112,000
Common stock outstanding not included in computation of diluted net income per share	4,900,000		1,300,000

[1] Options to purchase 4.9 million and 1.3 million shares of common stock were outstanding during the three months ended March 31, 2012 and 2011, respectively, but were not included in the computation of diluted net income per share as inclusion would have been anti-dilutive.