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Long Term Debt - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Jan. 31, 2014
Line Of Credit Facility [Line Items] |  |
Maximum borrowing capacity under loan agreement |  | $ 65.0 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Borrowings under credit facility | 15.0 us-gaap_LineOfCredit |
Debt maturity period | 2019-12 |
Average interest rate on bank debt | 4.32%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod |
Net assets pledged for secured debt facility | 58.7 us-gaap_PledgedAssetsNotSeparatelyReportedOnStatementOfFinancialPosition |
Debt instrument decrease period description | Every six months beginning June 30, 2016 through December 2019. |
Credit facility borrowing base | 25.0 us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity |
Maximum |  |
Line Of Credit Facility [Line Items] |  |
Ratio Of Indebtedness To Net Capital | 1.5 us-gaap_RatioOfIndebtednessToNetCapital1 / us-gaap_RangeAxis = us-gaap_MaximumMember |
Fair Value Inputs Earnings Before Interest Taxes Depreciation And Amortization Multiple | 3.0 us-gaap_FairValueInputsEarningsBeforeInterestTaxesDepreciationAndAmortizationMultiple / us-gaap_RangeAxis = us-gaap_MaximumMember |
Senior Tranche |  |
Line Of Credit Facility [Line Items] |  |
Maximum borrowing capacity under loan agreement |  | 50.0 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Decrease in debt instrument | 6.25 us-gaap_DebtInstrumentIncreaseDecreaseForPeriodNet / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
Debt instrument, commitment fee | 1.50%egy_DebtInstrumentCommitmentFee / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
Senior Tranche | London Interbank Offered Rate (LIBOR) |  |
Line Of Credit Facility [Line Items] |  |
Debt instrument interest rate | 3.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |
Subordinated Tranche |  |
Line Of Credit Facility [Line Items] |  |
Maximum borrowing capacity under loan agreement |  | 15.0 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LongtermDebtTypeAxis = us-gaap_SubordinatedDebtMember
Decrease in debt instrument | $ 1.88 us-gaap_DebtInstrumentIncreaseDecreaseForPeriodNet / us-gaap_LongtermDebtTypeAxis = us-gaap_SubordinatedDebtMember |
Debt instrument, commitment fee | 2.30%egy_DebtInstrumentCommitmentFee / us-gaap_LongtermDebtTypeAxis = us-gaap_SubordinatedDebtMember |
Subordinated Tranche | London Interbank Offered Rate (LIBOR) |  |
Line Of Credit Facility [Line Items] |  |
Debt instrument interest rate | 5.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_LongtermDebtTypeAxis = us-gaap_SubordinatedDebtMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |

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- Definition Line Of Credit Facility Maturity Period. + References No definition available. + Details
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- 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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- Definition Description of the increases or decreases in the carrying amount of the debt instrument for the period, and may include a discussion of any significant changes in the authorized and issued amounts of bonds, mortgages and other types of debt during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph f -Article 4 + Details
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- Definition Net increase or decrease in the carrying amount of the debt instrument for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph f -Article 4 + Details
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- Definition Market valuation of entity divided by earnings before interest, taxes, depreciation, and amortization (EBITDA), used as an input to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition The effective interest rate during the reporting period. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition The carrying amount, as of the date of the latest financial statement presented, of all assets that are pledged as collateral for the payment of the related debt obligation primarily arising from secured borrowings, repurchase agreements or other current or potential obligations, where the secured party does not have the right by contract or custom to sell or re-pledge the collateral and therefore are not reclassified and separately reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=34720971&loc=SL6224234-111729 + Details
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