Quicksilver Stockholders' Equity (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified			9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 Restricted Stock [Member]	Sep. 30, 2013 Restricted Stock [Member]	Sep. 30, 2014 Equity Option [Member]	Sep. 30, 2013 Equity Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares authorized	400,000,000	400,000,000
Shares of common stock outstanding	179,800,000	177,300,000
Common stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares outstanding	0	0
Preferred stock, par value	$ 0.01	$ 0.01
Total intrinsic values of options					6,300,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized			$ 14.8		$ 1.0
Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition			July 2017		August 2016
Estimated grant date fair value			12.6
Fair value of RSUs settled in cash			0.5
Allocated Share-based Compensation Expense			8.4	12.2	1.1	3.2
Total fair value of shares vested			$ 10.2
Common stock, shares issued	187,222,654	183,994,879
Treasury stock, shares	7,444,372	6,698,640