| **Rosetta Merger Narrative (Details) - Jul. 20, 2015 - Subsequent Event [Member] - Rosetta Resources, Inc [Member] a in Thousands, shares in Millions** | a business $ / shares shares |
|---------------------------------------------------------------------------------------------------------------------------------------------------------|------------------------------|
| **Business Acquisition [Line Items]**                                                                                                                   |                         |
| Number of onshore plays added in acquisition | business                                                                                                 | 2                            |
| Share price | $ / shares                                                                                                                                | $ 36.97                      |
| Eagle Ford Shale [Member]                                                                                                                               |                         |
| **Business Acquisition [Line Items]**                                                                                                                   |                         |
| Liquid rich asset based acquired                                                                                                                        | 50                           |
| Permian [Member]                                                                                                                                        |                         |
| **Business Acquisition [Line Items]**                                                                                                                   |                         |
| Liquid rich asset based acquired                                                                                                                        | 54                           |
| Delaware Basin [Member]                                                                                                                                 |                         |
| **Business Acquisition [Line Items]**                                                                                                                   |                         |
| Liquid rich asset based acquired                                                                                                                        | 45                           |
| Midland Basin [Member]                                                                                                                                  |                         |
| **Business Acquisition [Line Items]**                                                                                                                   |                         |
| Liquid rich asset based acquired                                                                                                                        | 9                            |
| Common Stock                                                                                                                                            |                         |
| **Business Acquisition [Line Items]**                                                                                                                   |                         |
| Shares exchange in acquisition | shares                                                                                                                 | 41                           |
| Exchange ratio of common shares for acquired company                                                                                                    | 0.542                        |

| X                                                                                                                                                                                                                                                                   |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Business Combination, Gas And Oil Area Acquired
+ References
No definition available.
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| X                                                                                                                                                                                                                                                             |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Business Combination, Stock Exchange Ratio
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of shares of equity interests issued or issuable to acquire entity.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479
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| X                                                                                                                                                                                                                                                                                                                                                                                                                    |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination.
+ References
No definition available.
+ Details**Name:**us-gaap_BusinessAcquisitionSharePrice**Namespace Prefix:**us-gaap_**Data Type:**num:perShareItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                     |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The number of businesses acquired by the entity during the period.
+ References
No definition available.
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| X                                                                                                                                                     |
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| X                                                                                                                                                     |
|-------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                  |
|----------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                           |
|---------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                |
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| X                                                                                                                                                                  |
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