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Subsequent Event (Details) - Senior Secured Reserve-Based Credit Facility - Revolving credit facility - Line of Credit - Subsequent Event	Apr. 11, 2016 USD ($)
Subsequent Event [Line Items]
Term of revolving credit facility (in years)	3 years
Maximum amount available under revolving credit facility	$ 50,000,000
Initial borrowing base	$ 10,000,000
Placement fee percentage	0.50%
Placement fee percentage	$ 50,000
Commitment fee percentage	0.25%
Total leverage ratio	3.00
Debt service coverage ratio	1.10
Minimum consolidated tangible net worth	$ 40,000,000
LIBOR
Subsequent Event [Line Items]
Basis spread on variable rate	275.00%
Prime rate
Subsequent Event [Line Items]
Basis spread on variable rate	1.00%

X

- Definition

Debt Covenant, Maximum Total Leverage Ratio

+ References

No definition available.

+ Details

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Namespace Prefix:	epm_
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Period Type:	instant

X

- Definition

Debt Service Coverage Ratio

+ References

No definition available.

+ Details

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X

- Definition

Line of Credit Facility, Covenant Compliance, Minimum Consolidated Tangible Net Worth

+ References

No definition available.

+ Details

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Namespace Prefix:	epm_
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Balance Type:	credit
Period Type:	instant

X

- Definition

Line of Credit Facility, Initial Borrowing Base

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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X

- Definition

Line of Credit Facility, Placement Fee Percentage

+ References

No definition available.

+ Details

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Namespace Prefix:	epm_
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Period Type:	duration

X

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
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X

- Definition

Amount of the fee that accompanies borrowing money under the debt instrument.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Balance Type:	debit
Period Type:	instant

X

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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X

- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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- Details

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X

- Details

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- Details

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- Details

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- Details

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- Details

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