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Liquidity (Details)	12 Months Ended
	Dec. 31, 2017 item
Minimum [Member]
Liquidity And Going Concern [Line Items]
Number of planned wells to be drilled in the next twelve months	2
Maximum [Member]
Liquidity And Going Concern [Line Items]
Number of planned wells to be drilled in the next twelve months	3

X

- Definition

Liquidity And Going Concern [Line Items]

+ References

No definition available.

+ Details

Name:	egy_LiquidityAndGoingConcernLineItems
Namespace Prefix:	egy_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number Of Planned Wells To Be Drilled In the Next Twelve Months

+ References

No definition available.

+ Details

Name:	egy_NumberOfPlannedWellsToBeDrilledInNextTwelveMonths
Namespace Prefix:	egy_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: