Supplemental Information Relating to Oil and Natural Gas Producing Activities (Unaudited) - Standardized Measure of Discounted Future Cash Flows Relating to Proved Reserves Disclosure (Details) (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]
Future cash inflows	$ 1,638.5
Future production costs	923.7
Future development costs	156.0
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Future Income Tax Expense	39.3
Future net cash flows	519.5
Discount of future net cash flows at 10% per annum	217.2
Standardized measure of discounted future net cash flows	$ 302.3
Oil
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]
Reference Price	95.04
Natural Gas
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]
Reference Price	3.60
Natural Gas Liquids
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]
Reference Price	38.64