v3.8.0.1

Derivative Instruments and Fair Value Measurements - Additional Information (Detail) - Swap [Member] - Cash Flow Hedges [Member] - Scenario, Forecast [Member] - May 2018 – December 2018 Contract [Member]	9 Months Ended
	Dec. 31, 2018 $ / bbl bbl
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Volume Transacted | bbl	2,000
Contract Price | $ / bbl	0.66

X

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

X

- Definition

Nominal volume used to calculate payments on a derivative instrument.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:volumeItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Specified interest rate, security price, commodity price, foreign exchange rate, index of prices or rates for a derivative contract measured in volume but not the derivative contract itself.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	us-types:perUnitItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementScenarioAxis=us-gaap_ScenarioForecastMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=arex_MayTwoThousandEighteenToDecemberTwoThousandEighteenContractMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: