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Subsequent Event - (Details) (Subsequent Event, USD $) In Thousands, unless otherwise specified	0 Months Ended
	Oct. 24, 2014 Mississippian Lime properties	Nov. 01, 2014 Dehli Field
Subsequent Event [Line Items]
Proceeds from sale of joint venture interest	$ 400
Reversionary working interest		23.90%
Associated revenue interest		19.10%
Royalty and overriding royalty interest		7.40%
Total net revenue interest		26.50%
Percentage of operating costs and capital expenditures responsible to pay		23.90%

X

- Definition

Gas And Oil Properties, Total Net Revenue Interest, Percentage

+ References

No definition available.

+ Details

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X

- Definition

Oil And Gas Properties, Operating Costs And Capital Expenditures, Percentage of Liability to Pay

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

X

- Definition

Oil And Gas Properties, Revenue Interest Percentage Related to Reversionary Working Interest

+ References

No definition available.

+ Details

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Namespace Prefix:	epm_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Oil And Gas Properties, Reversionary Working Interest Percentage

+ References

No definition available.

+ Details

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Namespace Prefix:	epm_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Oil And Gas Properties, Royalty And Overriding Royalty Interests

+ References

No definition available.

+ Details

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Namespace Prefix:	epm_
Data Type:	num:percentItemType
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X

- Definition

The cash inflow from the sale of an investment interest in a joint venture that the reporting entity has not previously accounted for using consolidation or the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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Period Type:	duration

X

- Details

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