Due to Other Related Parties, Amount Forgiven

No definition available.

Name:	mpet_DuetoOtherRelatedPartiesAmountForgiven
Namespace Prefix:	mpet_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Market Based Stock Options Numberof Consecutive Trading Days

+ References

No definition available.

+ Details

Name:	mpet_MarketBasedStockOptionsNumberofConsecutiveTradingDays
Namespace Prefix:	mpet_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Non-Employee Service Share-based Compensation, Accrual Stock Options Expense

+ References

No definition available.

+ Details

Name:	mpet_NonEmployeeServiceSharebasedCompensationAccrualStockOptionsExpense
Namespace Prefix:	mpet_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Non-Employee Service Share-based Compensation, Cash Award Alternative

+ References

No definition available.

+ Details

Name:	mpet_NonEmployeeServiceSharebasedCompensationCashAwardAlternative
Namespace Prefix:	mpet_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Share-based Compensation Arrangement By Share-based Payment Award, Number of Shares Available for Grant, Reduction for Options and Stock Appreciation Rights (SARs)

+ References

No definition available.

+ Details

Name:	mpet_SharebasedCompensationArrangementBySharebasedPaymentAwardNumberofSharesAvailableforGrantReductionforOptionsandStockAppreciationRightsSARs
Namespace Prefix:	mpet_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Other than Options, Maximum Number of Shares Allowed to be Issued Per Person Per Year

+ References

No definition available.

+ Details

Name:	mpet_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityOtherthanOptionsMaximumNumberofSharesAllowedtobeIssuedPerPersonPerYear
Namespace Prefix:	mpet_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant, Reduction for Equity Instruments Other Than Options And Stock Appreciation Rights (SARs)

+ References

No definition available.

+ Details

Name:	mpet_SharebasedCompensationArrangementbySharebasedPaymentAwardNumberofSharesAvailableforGrantReductionforEquityInstrumentsOtherThanOptionsAndStockAppreciationRightsSARs
Namespace Prefix:	mpet_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Sharebased Compensation Arrangementby Sharebased Payment Award Performance Metrics Weighted Average Percentage

+ References

No definition available.

+ Details

Name:	mpet_SharebasedCompensationArrangementbySharebasedPaymentAwardPerformanceMetricsWeightedAveragePercentage
Namespace Prefix:	mpet_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Sharebased Compensation Arrangementby Sharebased Payment Awards Median Stock Pricefor Vesting

+ References

No definition available.

+ Details

Name:	mpet_SharebasedCompensationArrangementbySharebasedPaymentAwardsMedianStockPriceforVesting
Namespace Prefix:	mpet_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Sharebased Compensation Arrangementby Sharebased Payment Awards Minimum Per Share Closing Pricefor Vesting

+ References

No definition available.

+ Details

Name:	mpet_SharebasedCompensationArrangementbySharebasedPaymentAwardsMinimumPerShareClosingPriceforVesting
Namespace Prefix:	mpet_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Stock Issued Shares Stock Options Exercised Netof Shares Withheldfor Tax Obligations

+ References

No definition available.

+ Details

Name:	mpet_StockIssuedSharesStockOptionsExercisedNetofSharesWithheldforTaxObligations
Namespace Prefix:	mpet_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_AllocatedShareBasedCompensationExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (j)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Unrecognized cost of unvested options awarded to employees as compensation.

+ References

No definition available.

+ Details

Name:	us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Noninterest expense related to directors' fees which are fees paid by an Entity to its directors. Directors' fees may be paid in addition to salary and other benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.14)
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

+ Details

Name:	us-gaap_NoninterestExpenseDirectorsFees
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(4)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of share instruments newly issued under a share-based compensation plan.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of shares or units of entity securities issued in the transaction in which equity securities were issued to pay for goods or nonemployee services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 50
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=68057994&loc=d3e25284-112666

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionQuantityOfSecuritiesIssued
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of non-vested options outstanding.

+ References

No definition available.

+ Details

Name:	us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Number of share options (or share units) exercised during the current 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(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 3: 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(28))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(2)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ 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(28))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 3: 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(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

+ Details

Name:	us-gaap_StockRepurchasedDuringPeriodShares
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_DirectorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CounterpartyNameAxis=mpet_OneStoneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=mpet_OneStoneExchangeAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_SellingGeneralAndAdministrativeExpensesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TitleOfIndividualAxis=mpet_NonEmployeeDirectorsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TitleOfIndividualAxis=us-gaap_DirectorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=mpet_MergerAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=mpet_TellurianMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=mpet_TimedBasedOptionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=mpet_PerformanceBasedOptionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=mpet_StockOptionsMarketBasedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=mpet_PriorPeriodAwardsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PlanNameAxis=mpet_A2012StockIncentivePlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PlanNameAxis=mpet_A1998StockIncentivePlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TitleOfIndividualAxis=us-gaap_ExecutiveOfficerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=mpet_MBOsandPBOsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PlanNameAxis=mpet_A2012OmnibusIncentiveCompensationPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	mpet_PerformanceMetricsWeightedAverageAxis=mpet_CO2EORDevelopmentProjectatPoplarMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	mpet_PerformanceMetricsWeightedAverageAxis=mpet_PreparingPoplarofCommerciallyViableCO2EORDevelopmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	mpet_PerformanceMetricsWeightedAverageAxis=mpet_ProgressingUKOperationsintheWealdBasinMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	mpet_PerformanceMetricsWeightedAverageAxis=mpet_MovingForwardwithFarnhamDomeProjectMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	mpet_PerformanceMetricsWeightedAverageAxis=mpet_CO2EORPilotProgramatPoplarMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	mpet_PerformanceMetricsWeightedAverageAxis=mpet_SaleofSubstantiallyAlloftheAmadeusBasinAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	mpet_PerformanceMetricsWeightedAverageAxis=mpet_ApprovalofaFarmoutAgreementorParticipationinDrillingaWellintheWealdBasinMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	mpet_PerformanceMetricsWeightedAverageAxis=mpet_ApprovalofaFarmoutAgreementintheBonaparteBasinMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_EmployeeStockOptionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Stock Based Compensation (Detail)					1 Months Ended		3 Months Ended		12 Months Ended
Stock Based Compensation (Detail)	Aug. 02, 2016 USD ($) shares	Jul. 01, 2015 USD ($)	Oct. 10, 2014 shares	Jul. 01, 2014 shares	Oct. 31, 2014 Trading_day $ / shares shares	Oct. 31, 2013 Trading_day $ / shares	Sep. 30, 2016 USD ($) shares	Sep. 30, 2015 USD ($) shares	Jun. 30, 2016 USD ($) shares	Jun. 30, 2015 USD ($) shares	Sep. 09, 2016 shares	Aug. 01, 2016 USD ($)	Mar. 31, 2016 USD ($)	Jan. 16, 2013 shares	Jan. 15, 2013 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant, reduction for options and stock appreciation rights														1
Number of shares available for grant, reduction for equity instruments other than options and stock appreciation rights														2
Expired (in shares)							0	33,333	291,403	12,499
Stock repurchased from former executive									189,062
Number of stock options granted							0	0	0	223,123
Number of stock options exercised							0	0	0	61,849
Common shares from options exercised, net of shares withheld for tax obligations (in shares)										34,112
Number of stock options forfeited/canceled							0	6,250	13,958	427,969
Fair value of stock options vesting \| $									$ 32,000	$ 132,000
Cash received from the exercise of stock options \| $									0	115,000
Share-based compensation expense (reversal of expense) \| $									701,000	$ 891,000
Unrecorded expected future compensation expense related to stock option awards \| $									275,000
Director \| One Stone \| One Stone Exchange Agreement
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding amount forgiven \| $												$ 174,000
Selling, General and Administrative Expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense (reversal of expense) \| $							$ 590,000	$ 108,000	742,000
Non-employee Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock options exercised				2,734
Share-based compensation expense (reversal of expense) \| $	$ 210,000
Cash award alternative \| $		$ 35,000
Accrual of non-employee service based compensation \| $							175,000						$ 175,000
Director \| Merger Agreement \| Tellurian
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock issued to nonemployee directors (in shares)	100,000
Director fees \| $	$ 150,000
Issuance of common stock (in shares)	100,000
TBOs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock options granted										16,875
PBOs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock options granted										156,250
MBOs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock options granted										49,998
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense (reversal of expense) \| $									$ (41,000)	$ (648,000)
Unrecorded expected future compensation expense related to stock option awards \| $							33,000	$ 796,000
Employee Stock Option \| Non-employee Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense (reversal of expense) \| $		$ 35,000								$ 264,000
Prior Period Awards \| Selling, General and Administrative Expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense (reversal of expense) \| $							$ 380,000
2012 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized														625,000
Expiration term							10 years		10 years
Market based and performance based shares available for future issuance							67,471		306,481		67,471
2012 Stock Incentive Plan \| PBOs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock options granted					156,250
2012 Stock Incentive Plan \| MBOs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock options granted					49,998
Vesting Period					3 years
Number of consecutive trading days \| Trading_day					90	10
Per share closing price (usd per share) \| $ / shares					$ 40.00	$ 18.80
Median stock price (usd per share) \| $ / shares					$ 40.00	$ 18.80
2012 Stock Incentive Plan \| Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Market based or performance based options, not vested (in shares)									332,028
1998 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized															36,054
Expired (in shares)									229,947
1998 Stock Incentive Plan \| Former executive
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchased from former executive			31,250		189,062
Number of stock options forfeited/canceled									189,062
1998 Stock Incentive Plan \| Employee Stock Option \| Former executive
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchased from former executive			189,062
1998 Stock Incentive Plan \| MBOs and PBOs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Market based or performance based options, not vested (in shares)							0
2012 Omnibus Incentive Compensation Plan \| Non-employee Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock issued to nonemployee directors (in shares)	119,505
Director fees \| $	$ 201,000
CO2-EOR Development Project at Poplar \| PBOs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance metrics weighted average					20.00%
CO2-EOR Development Project at Poplar \| 2012 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance metrics weighted average						40.00%
Preparing Poplarof Commercially Viable C O 2 E O R Development \| PBOs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance metrics weighted average					40.00%
Progressing U K Operationsinthe Weald Basin \| PBOs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance metrics weighted average					20.00%
Moving Forwardwith Farnham Dome Project \| PBOs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance metrics weighted average					20.00%
C O 2 E O R Pilot Programat Poplar [Member] \| 2012 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance metrics weighted average						10.00%
Saleof Substantially Allofthe Amadeus Basin Assets [Member] \| 2012 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance metrics weighted average						20.00%
Approvalofa Farmout Agreementor Participationin Drillinga Wellinthe Weald Basin [Member] \| 2012 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance metrics weighted average						20.00%
Approvalofa Farmout Agreementinthe Bonaparte Basin [Member] \| 2012 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance metrics weighted average						10.00%
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares allowed to be issued each year														125,000
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares allowed to be issued each year														62,500