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General Information (Unaudited) (Details) | 6 Months Ended
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Jun. 30, 2014 | Jun. 30, 2013 Plains Exploration & Production Company [Member] | Jun. 30, 2013 McMoRan Exploration Co [Member]
Business Acquisition [Line Items] |  |  |
Entity Information, Date to Change Former Legal or Registered Name | Jul. 14, 2014 |  |
Business Acquisition, Effective Date of Acquisition |  | May 31, 2013 | Jun. 03, 2013

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