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Quicksilver Stockholders' Equity (Restricted Stock And Stock Unit Activity) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Restricted Stock [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 14.8
Payable In Shares [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding at beginning of period, Shares 5,668,090
Granted, Shares 4,765,425
Vested, Shares (2,559,959)
Forfeited, Shares (348,554)
Outstanding at end of period, Shares 7,525,002
Outstanding at beginning of period, Wtd Avg Grant Date Fair Value $ 3.90
Granted, Wtd Avg Grant Date Fair Value $ 2.64
Vested, Wtd Avg Grant Date Fair Value $ 4.86
Forfeited, Wtd Avg Grant Date Fair Value $ 3.09
Outstanding at end of period, Wtd Avg Grant Date Fair Value $ 2.82
Payable In Cash [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding at beginning of period, Shares 1,572,341
Granted, Shares 0
Vested, Shares (631,275)
Forfeited, Shares (33,458)
Outstanding at end of period, Shares 907,608
Outstanding at beginning of period, Wtd Avg Grant Date Fair Value $ 3.69
Granted, Wtd Avg Grant Date Fair Value $ 0.00
Vested, Wtd Avg Grant Date Fair Value $ 4.29
Forfeited, Wtd Avg Grant Date Fair Value $ 3.20
Outstanding at end of period, Wtd Avg Grant Date Fair Value $ 3.32