W&T Offshore, Inc. Quarterly report pursuant to Section 13 or 15(d)

Quarterly report pursuant to Section 13 or 15(d)

Subsequent Events - Additional Information (Details)

Subsequent Events - Additional Information (Details) (USD $)	3 Months Ended	0 Months Ended	1 Months Ended	0 Months Ended
	Mar. 31, 2015	Apr. 23, 2015	Apr. 30, 2015	May 05, 2015	Dec. 31, 2014	Oct. 01, 2015
Subsequent Event [Line Items]
Aggregate principal amount of outstanding senior notes	900,000,000us-gaap_UnsecuredLongTermDebt				$ 900,000,000us-gaap_UnsecuredLongTermDebt
Scenario Forecast
Subsequent Event [Line Items]
Revolving bank credit facility borrowing base						550,000,000
Revolving Bank Credit Facility Due November 2018
Subsequent Event [Line Items]
Credit agreement expiration date	Nov. 08, 2018
Debt instrument annual interest rate percentage	3.20%
Subsequent Event
Subsequent Event [Line Items]
Borrowings under Credit Agreement margin increase		0.50%
Credit facility interest rate description		Borrowings under the Credit Agreement by 50 basis points (0.5%) on an annual basis such that the LIBOR borrowings are subject to applicable margins ranging from 2.25% to 3.25% and alternate base rate borrowings are subject to applicable margins ranging from 1.25% to 2.25%.
Aggregate principal amount of outstanding senior notes		900,000,000
Line of credit facility description		Following the Amendment, if the Company issues additional unsecured indebtedness in excess of the $900.0 million in aggregate principal amount of existing senior notes or if the Company issues debt that is subordinated in security to the indebtedness secured under the Credit Agreement, the borrowing base then in effect will be reduced by $0.33 for each dollar of such excess until the borrowing base is redetermined. In addition, the borrowing base will be reduced to $550.0 million effective October 1, 2015 irrespective of whether any additional indebtedness is issued. The Amendment also restricts the ability of the Company to make distributions or repurchase the existing senior notes or other permitted indebtedness (i) until June 30, 2016, (ii) if an event of default is continuing or would result from such distribution or (iii) if a borrowing base deficiency is continuing or would result therefrom; provided that the restriction in clause (i) of this sentence does not apply to (A) scheduled payments of interest, principal or redemptions on the Company’s existing senior notes or other permitted additional debt and (B) the redemption or repurchase by the Company of its outstanding senior notes in an aggregate principal amount equal to the aggregate principal amount of any new issuance of senior unsecured notes, provided that any such new notes are not subject to covenants and events of default that are, taken as a whole, materially more restrictive on the Company than its outstanding senior notes and such new notes mature at least six months after the maturity date of the Credit Agreement.
Reduction of base rate		0.33
Mortgaged collateral requirement	80.00%	90.00%
Percentage of oil and natural gas production to be hedged from June 1, 2015 to Dec. 31, 2015		25.00%
Percentage of oil and natural gas production to be hedged for 2016		35.00%
Subsequent Event \| Minimum \| First Quarter of 2015
Subsequent Event [Line Items]
Current ratio		75.00%
Subsequent Event \| Minimum \| Second Quarter of 2015
Subsequent Event [Line Items]
Current ratio		75.00%
Subsequent Event \| Minimum \| Third Quarter of 2015
Subsequent Event [Line Items]
Current ratio		75.00%
Subsequent Event \| Minimum \| Fourth Quarter of 2015
Subsequent Event [Line Items]
Current ratio		75.00%
Subsequent Event \| Minimum \| Fourth Quarter of 2015 and Thereafter
Subsequent Event [Line Items]
Current ratio		100.00%
Subsequent Event \| Minimum \| First Quarter of 2015 and Thereafter
Subsequent Event [Line Items]
Interest coverage ratio		220.00%
Subsequent Event \| Minimum \| London Interbank Offered Rate (LIBOR)
Subsequent Event [Line Items]
Debt instrument, basis spread on variable rate		2.25%
Subsequent Event \| Minimum \| Alternate Base Rate
Subsequent Event [Line Items]
Debt instrument, basis spread on variable rate		1.25%
Subsequent Event \| Maximum \| Second Quarter of 2016
Subsequent Event [Line Items]
Leverage ratio		500.00%
Subsequent Event \| Maximum \| Third Quarter of 2016
Subsequent Event [Line Items]
Leverage ratio		450.00%
Subsequent Event \| Maximum \| Fourth Quarter of 2016 and Thereafter
Subsequent Event [Line Items]
Leverage ratio		400.00%
Subsequent Event \| Maximum \| First Quarter of 2015 and Thereafter
Subsequent Event [Line Items]
First lien leverage ratio		250.00%
Secured debt leverage ratio		350.00%
Subsequent Event \| Maximum \| London Interbank Offered Rate (LIBOR)
Subsequent Event [Line Items]
Debt instrument, basis spread on variable rate		3.25%
Subsequent Event \| Maximum \| Alternate Base Rate
Subsequent Event [Line Items]
Debt instrument, basis spread on variable rate		2.25%
Subsequent Event \| Revolving Bank Credit Facility Due November 2018
Subsequent Event [Line Items]
Revolving bank credit facility borrowing base		600,000,000	600,000,000
Credit agreement expiration date		Nov. 08, 2018
Aggregate principal amount of outstanding senior notes			900,000,000
Reduction of base rate			0.33
Subsequent Event \| Second Lien Term Loan
Subsequent Event [Line Items]
Revolving bank credit facility borrowing base				500,000,000
Term loan				300,000,000
Debt instrument term				5 years
Debt instruments, discount rate				1.00%
Debt instrument annual interest rate percentage				9.00%
Subsequent Event \| Second Lien Term Loan \| Chief Executive Officer
Subsequent Event [Line Items]
Debt instrument, principal commitment amount				$ 5,000,000