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Summary of Significant Policies.

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Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale which are intended to be held for less than one year or the normal operating cycle, whichever is longer.

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Summary of Significant Policies (Details Textual) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense recognized within general and administrative expenses related to stock option and restricted stock grants			$ 7,012,000	$ 8,542,000
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated fair value of Stone Energy Corporation common stock held for sale	62,482,000		62,482,000		84,637,000
Cost basis of Stone Energy Corporation common stock held for sale	18,900,000		18,900,000
Summary of Significant Policies (Textuals) [Abstract]
Income Tax expense on Realized gain on marketable securities	2,968,000	1,992,000	10,405,000	1,992,000
Income tax expense (benefit) Unrealized gain (loss) on marketable securities	(2,307,000)	(10,630,000)	8,252,000	(11,188,000)
Unrealized gain on available for sale securities			28,300,000
Proceeds from sale of Stone Energy Corporation Common stock held for Sale	11,900,000	10,500,000	45,700,000	10,500,000
Gain before income taxes from sale of Stone Energy Corporation common stock held for sale	8,500,000	5,700,000	29,700,000	5,700,000
Impairment charges related to unevaluated properties			9,500,000
Impairment charges related to oil and gas properties	0		0	200,000
Outstanding derivative financial instrument	0	0	0	0
Weighted average grant date fair value of unvested restricted stock	$ 35.17		$ 35.17
Stock options outstanding	203,150		203,150
Weighted average exercise price	$ 36.64		$ 36.64
Stock options exercisable	203,150		203,150
Cash proceeds from exercise of stock options				1,300,000
Customary rate			35.00%
Number of state jurisdictions in which state tax returns are under review			1
Interest costs, capitalized during period	3,500,000	2,900,000	6,600,000	5,500,000
General and Administrative Expense [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense recognized within general and administrative expenses related to stock option and restricted stock grants	3,900,000	4,300,000	7,000,000	8,500,000
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to nonvested stock options	0		0
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of unvested restricted stock outstanding	1,638,400		1,638,400		2,069,275
Unrecognized compensation cost related to nonvested stock options	28,000,000		28,000,000
Period over which unrecognized compensation cost related to nonvested stock options expected to be recognized			2.4
Director [Member]
Additional Summary of Significant Policies (Textuals) [Abstract]
Restricted stock shares awarded to independent directors			26,000
Vesting period of restricted stock awarded to independent directors			3 years
Grant date fair value for awards			$ 26.52
Common Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Shares of Stone Energy Corporation common stock held by company	2,056,000		2,056,000
Shares of Stone Energy Corporation common stock sold by company	370,000	520,000	1,741,000	520,000
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated fair value of Stone Energy Corporation common stock held for sale	$ 62,482,000		$ 62,482,000