Commitments and Contingencies (Details)	1 Months Ended				12 Months Ended					12 Months Ended				12 Months Ended
	Jul. 31, 2013 USD ($)	Aug. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Mar. 31, 2010 item	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($) acre	Dec. 31, 2011 USD ($)	Dec. 31, 2013 SES and SEPCO [Member] USD ($)	Dec. 31, 2013 Midstream Services and E&P [Member] USD ($) item	Dec. 31, 2013 Exploration Program in Canada [Member] USD ($)	Dec. 31, 2013 Exploration Program in Canada [Member] CAD	Mar. 31, 2010 Exploration Program in Canada [Member] CAD acre	Dec. 31, 2013 Maximum [Member] SES and SEPCO [Member] USD ($)	Dec. 31, 2013 Maximum [Member] Midstream Services and E&P [Member]	Dec. 31, 2013 Minimum [Member] Midstream Services and E&P [Member]
Operating Leases, Future Minimum Payments, Due in Two Years					$ 55,900,000				$ 24,500,000
Future Demand Transportation Charges Due 2014					362,800,000
Future Demand Transportation Charges Due 2015					399,200,000
Future Demand Transportation Charges Due 2016					413,200,000
Future Demand Transportation Charges Due 2017					375,700,000
Future Demand Transportation Charges Due 2018					363,300,000
Future Demand Transportation Charges Due Thereafter (After 2018)					1,594,700,000
Number of leases									11
Aggregate annual lease payment for the 11 leases for pressure pumping equipment for E&P									7,500,000
Lease Expiration Date					Dec. 31, 2027									Jan. 01, 2018	Dec. 01, 2017
Operating Leases, Future Minimum Payments Due in 2014					65,200,000				38,600,000
Operating Leases, Future Minimum Payments, Due in 2015					55,900,000				24,500,000
Operating Leases, Future Minimum Payments, Due in 2016					44,600,000				17,200,000
Operating Leases, Future Minimum Payments, Due in 2017					27,800,000				9,200,000
Operating Leases, Future Minimum Payments, Due in 2018					10,800,000				3,700,000
Obligations for demand and similar charges under transportation agreements								3,500,000,000
Contractual Obligation													100,000,000
Operating Leases, Future Minimum Payments, Due Thereafter					24,900,000				700,000
Unrecorded capital investments obligation, Exploration program acres coverage (acres)												2,500,000
Unrecorded capital investments obligation												47,000,000
Unrecorded promissory note payable												44,500,000
Capital investments related to E&P program in Canada					35,400,000	11,600,000	18,700,000			36,900,000	39,200,000
Area of land purchased						26
Current obligation for construction costs incurred					38,000,000
Lease period upon construction completion					P5Y
Litigation settlement, gross			11,400,000
Litigation, portion of profits considered for disgorgement			381,500,000
Actual damages recoverable by plaintiff per August 2011 judgement		11,400,000
Disgorgement recoverable by plaintiff per August 2011 judgement		23,900,000
Prejudgement interest and attorney's fees recoverable by plaintiff per August 2011 judgement		8,900,000
Disgorgement recoverable by plaintiff to be reversed	23,900,000
Actual damages recoverable by plaintiff to be reversed	11,400,000
Litigation settlement upheld	11,400,000
Litigation, SEPCO's estimated gross liability including interest and attorney's fees.					$ 45,500,000
Number of horizontal wells operated by SEECO in Arkansas				27