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Supplemental Information Relating to Oil and Natural Gas Producing Activities (Unaudited) - Schedule of Changes in Standardized Measure of Discounted Future Net Cash Flows (Details) (EXCO/HGI JV, USD $) In Millions, unless otherwise specified	7 Months Ended
	Sep. 30, 2013
EXCO/HGI JV
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]
Sales and transfers of oil and natural gas produced	$ (46.2)
Net changes in prices and production costs	39.2
Extensions and discoveries, net of future development and production costs	8.1
Development costs during the period	7.4
Changes in estimated future development costs	20.2
Revisions of previous quantity estimates	(50.2)
Sales of reserves in place	0
Purchase of reserves in place	300.6
Accretion of discount before income taxes	16.1
Changes in timing and other	27.9
Changes in Future Income Tax Expense Estimates on Future Cash Flows Related to Proved Oil and Gas Reserves	(20.8)
Net change	$ 302.3

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Amount of increase (decrease) in standardized measure of discounted future net cash flow as a result of passage of time.

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