Long-Term Debt (Schedule Of Outstanding Debt) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2011
Debt Instrument [Line Items]
Commitment fee percentage	0.50%
Maximum [Member]
Debt Instrument [Line Items]
Commitment fee percentage	0.50%
Minimum [Member]
Debt Instrument [Line Items]
Commitment fee percentage	0.375%
U.S. Credit Facility [Member] | Highest [Member]
Debt Instrument [Line Items]
Principal amount	$ 850.0
Scheduled maturity date	Sep. 06, 2016	[1]
Interest rate on outstanding borrowings at September 30, 2011	1.75%	[1],[2],[3],[4],[5]
Base interest rate options	LIBOR, ABR (6)	[1],[3]
Financial covenants	- Minimum current ratio of 1.0- Minimum EBITDA to cash interest expense ratio of 2.5	[1],[6]
Significant restrictive covenants	- Incurrence of debt- Incurrence of liens- Payment of dividends- Equity purchases- Asset sales- Affiliate transactions- Limitations on derivatives	[1],[6]
Optional redemption	Any time	[1],[6]
Make-whole redemption	N/A	[1],[6]
Change of control	Event of default	[1],[6]
Equity clawback	N/A	[1],[6]
Subsidiary guarantors	Cowtown Pipeline Funding, Inc. Cowtown Pipeline Management, Inc. Cowtown Pipeline L.P. Cowtown Gas Processing L.P.	[1],[6]
Estimated fair value	137.0	[1],[7]
Canadian Credit Facility [Member] | Highest [Member]
Debt Instrument [Line Items]
Scheduled maturity date	Sep. 06, 2016	[1]
Interest rate on outstanding borrowings at September 30, 2011	3.547%	[1],[2],[3],[4]
Base interest rate options	CDOR, Canadian prime, U.S. prime or LIBOR (7)	[1],[2]
Financial covenants	- Minimum current ratio of 1.0- Maximum net debt to EBITDA ratio of 4.5	[1],[6]
Significant restrictive covenants	- Incurrence of debt- Incurrence of liens- Payment of dividends- Equity purchases- Asset sales- Affiliate transactions- Limitations on derivatives	[1],[6]
Optional redemption	Any time	[1],[6]
Make-whole redemption	N/A	[1],[6]
Change of control	Event of default	[1],[6]
Equity clawback	N/A	[1],[6]
Subsidiary guarantors	N/A	[1],[6]
Estimated fair value	117.3	[1],[7]
Senior Notes Due 2015 [Member] | Equal [Member]
Debt Instrument [Line Items]
Principal amount	438.0	[1]
Scheduled maturity date	Aug. 01, 2015	[1]
Interest rate on outstanding borrowings at September 30, 2011	8.25%	[1],[2],[3],[4]
Base interest rate options	N/A	[1]
Financial covenants	N/A	[1],[6]
Significant restrictive covenants	- Incurrence of debt- Incurrence of liens- Payment of dividends- Equity purchases- Asset sales- Affiliate transactions	[1],[6]
Optional redemption	August 1, 2012: 103.875 2013: 101.938 2014: par	[1],[6]
Make-whole redemption	Callable prior to August 1, 2012 at make-whole call price of Treasury + 50 bps	[1],[6]
Change of control	Put at 101% of principal plus accrued interest	[1],[6]
Equity clawback	N/A	[1],[6]
Subsidiary guarantors	Cowtown Pipeline Funding, Inc. Cowtown Pipeline Management, Inc. Cowtown Pipeline L.P. Cowtown Gas Processing L.P.	[1],[6]
Estimated fair value	442.4	[1],[7]
Senior Notes Due 2016 [Member] | Equal [Member]
Debt Instrument [Line Items]
Principal amount	591.0	[1]
Scheduled maturity date	Jan. 01, 2016	[1]
Interest rate on outstanding borrowings at September 30, 2011	11.75%	[1],[2],[3],[4]
Base interest rate options	N/A	[1]
Financial covenants	N/A	[1],[6]
Significant restrictive covenants	- Incurrence of debt- Incurrence of liens- Payment of dividends- Equity purchases- Asset sales- Affiliate transactions	[1],[6]
Optional redemption	July 1, 2013: 105.875 2014: 102.938 2015: par	[1],[6]
Make-whole redemption	Callable prior to July 1, 2013 at make-whole call price of Treasury + 50 bps	[1],[6]
Change of control	Put at 101% of principal plus accrued interest	[1],[6]
Equity clawback	Redeemable until July 1, 2012 at111.75%, plus accrued interest for up to 35%	[1],[6]
Subsidiary guarantors	Cowtown Pipeline Funding, Inc. Cowtown Pipeline Management, Inc. Cowtown Pipeline L.P. Cowtown Gas Processing L.P.	[1],[6]
Estimated fair value	649.7	[1],[7]
Senior Notes Due 2019 [Member] | Equal [Member]
Debt Instrument [Line Items]
Principal amount	298.0	[1]
Scheduled maturity date	Aug. 15, 2019	[1]
Interest rate on outstanding borrowings at September 30, 2011	9.125%	[1],[2],[3],[4]
Base interest rate options	N/A	[1]
Financial covenants	N/A	[1],[6]
Significant restrictive covenants	- Incurrence of debt- Incurrence of liens- Payment of dividends- Equity purchases- Asset sales- Affiliate transactions	[1],[6]
Optional redemption	August 15, 2014: 104.563 2015: 103.042 2016: 101.521 2017: par	[1],[6]
Make-whole redemption	Callable prior toAugust 15, 2014 atmake-whole call price of Treasury + 50 bps	[1],[6]
Change of control	Put at 101% of principal plus accrued interest	[1],[6]
Equity clawback	Redeemable until August 15, 2012 at109.125%, plus accrued interest for up to 35%	[1],[6]
Subsidiary guarantors	Cowtown Pipeline Funding, Inc. Cowtown Pipeline Management, Inc. Cowtown Pipeline L.P. Cowtown Gas Processing L.P.	[1],[6]
Estimated fair value	302.5	[1],[7]
Convertible Debentures [Member] | Lowest [Member]
Debt Instrument [Line Items]
Principal amount	150.0	[1],[8]
Scheduled maturity date	Nov. 01, 2024	[1],[8]
Interest rate on outstanding borrowings at September 30, 2011	1.875%	[1],[2],[3],[4],[8]
Base interest rate options	N/A	[1],[8]
Financial covenants	N/A	[1],[6],[8]
Significant restrictive covenants	N/A	[1],[6],[8]
Optional redemption	November 8, 2011 and thereafter	[1],[6],[8]
Make-whole redemption	N/A	[1],[6],[8]
Change of control	Put at 100% of principal plus accrued interest	[1],[6],[8]
Equity clawback	N/A	[1],[6],[8]
Subsidiary guarantors	N/A	[1],[6],[8]
Estimated fair value	149.9	[1],[7],[8]
Senior Subordinated Notes Due 2016 [Member] | Lowest [Member]
Debt Instrument [Line Items]
Principal amount	350.0	[1]
Scheduled maturity date	Apr. 01, 2016	[1]
Interest rate on outstanding borrowings at September 30, 2011	7.125%	[1],[2],[3],[4]
Base interest rate options	N/A	[1]
Financial covenants	N/A	[1],[6]
Significant restrictive covenants	- Incurrence of debt- Incurrence of liens- Payment of dividends- Equity purchases- Asset sales- Affiliate transactions	[1],[6]
Optional redemption	April 1, 2012: 102.375 2013: 101.188 2014: par	[1],[6]
Make-whole redemption	N/A	[1],[6]
Change of control	Put at 101% of principal plus accrued interest	[1],[6]
Equity clawback	N/A	[1],[6]
Subsidiary guarantors	Cowtown Pipeline Funding, Inc. Cowtown Pipeline Management, Inc. Cowtown Pipeline L.P. Cowtown Gas Processing L.P.	[1],[6]
Estimated fair value	$ 325.5	[1],[7]
U.S. Credit Facility [Member]
Debt Instrument [Line Items]
Equity interests	100.00%
Canadian Credit Facility [Member]
Debt Instrument [Line Items]
Equity interests	100.00%

[1] Borrowings under the U.S. Credit Facility are guaranteed by certain of Quicksilver's domestic subsidiaries and are secured by 100% of the equity interests of each of Cowtown Pipeline Management, Inc., Cowtown Pipeline Funding, Inc., Cowtown Gas Processing L.P. and Cowtown Pipeline L.P., and certain oil and gas properties and related assets of Quicksilver. Currently, there are no guarantors under the Canadian Credit Facility, and borrowings under the Canadian Credit Facility are secured by 100% of the equity interests of Quicksilver Resources Canada Inc. and its oil and gas properties and related assets. The other debt presented is based upon structural seniority and priority of payment.

[2] Amounts outstanding under the Canadian Credit Facility bear interest, at our election, at (i) the CDOR Rate (as defined in the credit agreement) plus an applicable margin between 1.75% and 2.75%, (ii) the Canadian Prime Rate (as defined in the credit agreement) plus an applicable margin between 0.75% and 1.75%, (iii) the U.S. Prime Rate (as defined in the credit agreement) plus an applicable margin between 0.75% and 1.75% and (iv) U.S. eurodollar loans (as defined in the credit agreement) plus an applicable margin between 1.75% to 2.75% We pay a per annum fee on all letters of credit issued under the Canadian Credit Facility equal to the applicable margin and a commitment fee on the unused availability of 0.50% per annum, in each case, based on borrowing base usage.

[3] Amounts outstanding under the U.S. Credit Facility bear interest, at our election, at (i) adjusted LIBOR (as defined in the credit agreement) plus an applicable margin between 1.50% to 2.50%, (ii) ABR (as defined in the credit agreement), which is the greatest of (a) the prime rate announced by JPMorgan, (b) the federal funds rate plus 0.50% and (c) adjusted LIBOR (as defined in the credit agreement) plus 1.0%, plus, in each case under scenario (ii), an applicable margin between 0.50% to 1.50%. We also pay a per annum fee on all letters of credit issued under the U.S. Credit Facility equal to the applicable margin and a commitment fee on the unused availability of 0.375% to 0.50%, in each case, based on borrowing base usage.

[4] Represents the weighted average borrowing rate payable to lenders and excludes effects of interest rate derivatives.

[5] The principal amount for the U.S. Credit Facility represents the borrowing base and commitments as of September 30, 2011.

[6] The information presented in this table is qualified in all respects by reference to the full text of the covenants, provisions and related definitions contained in the documents governing the various components of our debt.

[7] The estimated fair value is determined based on market quotations on the balance sheet date for fixed rate obligations. We consider debt with variable interest rates to have a fair value equal to its carrying value.

[8] Beginning on November 8, 2011, we have the ability to redeem the convertible debentures.