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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Detail) (USD $) | 3 Months Ended | 6 Months Ended |  |
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Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 Jurisdictions | Jun. 30, 2012 | May 14, 2013 | Dec. 31, 2012
Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Proceeds from sale of Stone Energy Corporation common stock available for sale |  |  | $ 13,392,000 | $ 37,705,000 |  |
Sale price of discontinued properties |  |  |  |  | 823,700,000 |
Realized gain on discontinued properties, net of taxes | 230,600,000 |  | 230,600,000 |  |  |
Impairment charges for unevaluated properties | 9,500,000 |  | 11,900,000 | 1,300,000 |  |
Impairment charges related to oil and gas properties | 700,000 |  | 700,000 | 5,400,000 |  |
Realized gains (losses) on oil price swaps | 2,900,000 | 2,700,000 | 5,200,000 | 1,400,000 |  |
Unrealized gain (loss) on derivative financial instrument due to change in fair value | 3,524,000 |  | 3,524,000 |  |  | 11,651,000
Unrealized gain (loss) from derivatives | 640,000 | 34,797,000 | (8,127,000) | 24,610,000 |  |
Stock-based compensation expense recognized |  |  | 6,440,000 | 6,860,000 |  |
Interest costs, capitalized during period | 700,000 | 5,400,000 | 3,700,000 | 10,600,000 |  |
State jurisdictions currently under review |  |  | 2 |  |  |
Customary rate | 35.00% | 35.00% | 35.00% | 35.00% |  |
Restricted Stock |  |  |  |  |  |
Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Shares of unvested restricted stock outstanding | 1,519,889 |  | 1,519,889 |  |  | 1,960,835
Weighted average grant date fair value of restricted stock grants per share | $ 24.02 |  | $ 24.02 |  |  |
Unrecognized compensation cost | 14,300,000 |  | 14,300,000 |  |  |
Period in which compensation cost expected to be recognized |  |  | 2 years |  |  |
Performance Stock Units |  |  |  |  |  |
Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Unrecognized compensation cost | 3,700,000 |  | 3,700,000 |  |  |
Period in which compensation cost expected to be recognized |  |  | 1 year 8 months 12 days |  |  |
Number of performance share units, outstanding |  |  | 249,302 |  |  |
Grant date fair value of share units, per unit |  |  | $ 21.19 |  |  |
Performance Multiplier, minimum |  |  | 0.00% |  |  |
Performance Multiplier, maximum |  |  | 300.00% |  |  |
Stock Options |  |  |  |  |  |
Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Unrecognized compensation cost | 0 |  | 0 |  |  |
Number of Options Outstanding | 115,150 |  | 115,150 |  |  |
Weighted average exercise price | $ 32.90 |  | $ 32.90 |  |  |
Number of option, Exercised |  |  | 0 | 0 |  |
General and Administrative Expense |  |  |  |  |  |
Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Stock-based compensation expense recognized | 3,200,000 | 3,400,000 | 6,400,000 | 6,900,000 |  |
Common Stock Marketable Securities |  |  |  |  |  |
Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Shares of Stone Energy Corporation common stock held by company |  |  |  |  |  | 600,000
Shares of Stone Energy Corporation common stock sold by Company |  |  |  | 1,206,000 |  |
Proceeds from sale of Stone Energy Corporation common stock available for sale |  |  | 13,400,000 | 37,700,000 |  |
Realized gain on available-for-sale securities before income tax |  |  | 7,900,000 | 26,600,000 |  |
Cost basis of Stone Energy Corporation common stock sold | $ 5,500,000 |  | $ 5,500,000 |  |  |

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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(b) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(a) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(a) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(b) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(a) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of open agreements to purchase or sell mineral resources, energy, and agricultural products at some future point held at each balance sheet date, that was included in earnings for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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