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

Quarterly report pursuant to Section 13 or 15(d)

Cover
- Document and Entity Information
Financial Statements
Notes to Financial Statements
Accounting Policies
- Basis of Presentation (Policies)
Notes Tables
Notes Details

Share-Based Compensation and Cash-Based Incentive Compensation - Additional Information (Detail)

v2.4.0.8

Share-Based Compensation and Cash-Based Incentive Compensation - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified		3 Months Ended			12 Months Ended		3 Months Ended		3 Months Ended			12 Months Ended		3 Months Ended	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2014 Common Stock	Mar. 31, 2014 Restricted Stock Units (RSUs)	Mar. 31, 2013 Restricted Stock Units (RSUs)	Dec. 31, 2013 Restricted Stock Units (RSUs) London Interbank Offered Rate	Dec. 31, 2012 Restricted Stock Units (RSUs) London Interbank Offered Rate	Mar. 31, 2014 CEO’s 2013 Award	Mar. 31, 2014 Directors Compensation Plan	Mar. 31, 2014 Restricted Stock	Mar. 31, 2013 Restricted Stock	Mar. 31, 2014 Minimum Restricted Stock Units (RSUs)	Dec. 31, 2013 Minimum Restricted Stock Units (RSUs)	Dec. 31, 2012 Minimum Restricted Stock Units (RSUs)	Mar. 31, 2014 Maximum Restricted Stock Units (RSUs)	Dec. 31, 2013 Maximum Restricted Stock Units (RSUs)	Dec. 31, 2012 Maximum Restricted Stock Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Adjusted EBITDA margin											0.00%			100.00%
Common stock, price per share							$ 14.66
Common stock available for award under plans	5,036,436							519,379
Shares granted, grant date fair value			$ 19.4	$ 0					$ 0	$ 0
Shares vested, vested date fair value			0	0					0	0
Risk-free interest rate, minimum					0.27%	0.15%
Risk-free interest rate, maximum					0.91%	0.72%
Expected volatility												30.00%	33.00%		63.00%	74.00%
Expected dividend yield												0.00%	0.00%		3.10%	2.50%
Correlation of movement of total shareholder return												(84.00%)	(67.00%)		95.00%	94.00%
Number of shares granted			1,150,233				42,547
Number of shares issued							42,547
Unrecognized share-based compensation expense		$ 0.9	$ 27.0						$ 0.4
Recognition period for unrecognized compensation expense		2015-02	2016-11						2016-04

- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The maximum risk-free interest rate assumption that is used in valuing an option on its own shares.

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The minimum risk-free interest rate assumption that is used in valuing an option on its own shares.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Number of share instruments newly issued under a share-based compensation plan.

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The grant date fair value of share-based compensation arrangements (other than options) granted in the period.

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Share based compensation arrangement by share based payment award fair value assumptions adjusted EBITDA margin.

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Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Correlation Of Returns

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Share Based Compensation Arrangement by Share Based Payment Award Unrecognized Compensation Expenses Period for Recognition

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