Earnings Per Share (Reconciliation Of Components Used To Compute Basic And Diluted Net Income Per Common Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income (loss) attributable to Quicksilver		$ (184,212)	$ 23,757	$ (471,718)	$ (71,171)
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic	[1]	0	772	0	0
Income (loss) available to shareholders		$ (184,212)	$ 22,985	$ (471,718)	$ (71,171)
Weighted Average Number of Shares Outstanding, Basic		176,206	173,936	176,021	173,783
Share-based compensation awards	[2]	0	216	0	0
Weighted Average Number of Shares Outstanding, Diluted		176,206	174,152	176,021	173,783
Earnings (loss) per common share - basic		$ (1.05)	$ 0.13	$ (2.68)	$ (0.41)
Earnings (loss) per common share - diluted	[2]	$ (1.05)	$ 0.13	$ (2.68)	$ (0.41)
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive shares excluded from the diluted share calculation		6,400	6,600	6,400	6,600
Restricted Stock Units (RSUs) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive shares excluded from the diluted share calculation		900	1,200	900	800

[1] Restricted share awards that contain nonforfeitable rights to dividends are participating securities and, therefore, are included in computing earnings per share using the two-class method. Participating securities, however, do not participate in undistributed net losses because there is no contractual obligation to do so.

[2] For the three months ended September 30, 2015, 6.4 million shares associated with our stock options and 0.9 million shares associated with our unvested RSUs were antidilutive and, therefore, excluded from the diluted share calculations. For the three months ended September 30, 2014, 6.6 million shares associated with our stock options and 1.2 million shares associated with our unvested RSUs were antidilutive and, therefore, excluded from the diluted share calculations. For the nine months ended September 30, 2015, 6.4 million shares associated with our stock options and 0.9 million shares associated with our unvested RSUs were antidilutive and, therefore, excluded from the diluted share calculations. For the nine months ended September 30, 2014, 6.6 million shares associated with our stock options and 0.8 million shares associated with our unvested RSUs were antidilutive and, therefore, excluded from the diluted share calculations.