General Information (Unaudited) (Details)	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Plains Exploration & Production Company [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition	May 31, 2013
Business Acquisition, Date Results Included in Combined Entity	Jun. 01, 2013
McMoRan Exploration Co [Member]
Business Acquisition [Line Items]
Business Acquisition, Date of Acquisition Agreement		Dec. 05, 2012
Business Acquisition, Effective Date of Acquisition	Jun. 03, 2013
Business Acquisition, Date Results Included in Combined Entity	Jun. 04, 2013