Risk Management and Derivative Instruments - Commodity Derivatives (Detail) $ in Millions	6 Months Ended
Jun. 30, 2025 USD ($) MMBTU $ / MMBTU $ / bbl bbl
Natural gas derivative fixed price swaps 2025
Derivative
Average monthly volume (MMBtu) \| MMBTU	560,000
Weighted-average fixed price	3.75
Natural gas derivative two way collar contracts 2025
Derivative
Average monthly volume (MMBtu) \| MMBTU	500,000
Weighted-average floor price	3.5
Weighted-average ceiling price	3.9
Crude oil derivative fixed price swap 2025
Derivative
Average monthly volume (Bbls) \| bbl	170,000
Weighted-average fixed price \| $ / bbl	70.32
Crude oil derivative two way collars contracts 2025
Derivative
Average monthly volume (Bbls) \| bbl	17,000
Weighted-average floor price \| $ / bbl	70
Weighted-average ceiling price \| $ / bbl	80.2
Natural gas derivative fixed price swaps 2026
Derivative
Average monthly volume (MMBtu) \| MMBTU	515,000
Weighted-average fixed price	3.8
Natural gas derivative two way collar contracts 2026
Derivative
Average monthly volume (MMBtu) \| MMBTU	517,500
Weighted-average floor price	3.58
Weighted-average ceiling price	4.11
Crude oil derivative fixed price swap 2026
Derivative
Average monthly volume (Bbls) \| bbl	146,500
Weighted-average fixed price \| $ / bbl	65.77
Natural gas derivative fixed price swaps 2027
Derivative
Average monthly volume (MMBtu) \| MMBTU	197,500
Weighted-average fixed price	3.96
Natural gas derivative two way collar contracts 2027
Derivative
Average monthly volume (MMBtu) \| MMBTU	640,000
Weighted-average floor price	3.54
Weighted-average ceiling price	4.31
Crude oil derivative fixed price swap 2027
Derivative
Average monthly volume (Bbls) \| bbl	45,667
Weighted-average fixed price \| $ / bbl	62.57
Natural gas derivative fixed price swaps 2028
Derivative
Average monthly volume (MMBtu) \| MMBTU	20,000
Weighted-average fixed price	3.86
Natural gas derivative two way collar contracts 2028
Derivative
Average monthly volume (MMBtu) \| MMBTU	67,500
Weighted-average floor price	3.5
Weighted-average ceiling price	4.52
Revolving Credit Facility
Derivative
Amount offset of outstanding under the revolving credit facility \| $	$ 9.9

Derivative weighted average fixed price.

No definition available.

Name:	ampy_DerivativeWeightedAverageFixedPrice
Namespace Prefix:	ampy_
Data Type:	srt-types:perUnitItemType
Balance Type:	na
Period Type:	instant

- Definition

The cap rate on a price risk derivative such as a cap or collar. A payment or receipt is triggered if the market rate exceeds the cap rate on the contract.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeCapPrice
Namespace Prefix:	us-gaap_
Data Type:	srt-types:perUnitItemType
Balance Type:	na
Period Type:	instant

- Definition

Floor rate on a price risk derivative such as a floor or a collar. A payment or receipt is triggered if the market rate falls below the floor rate on the contract.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeFloorPrice
Namespace Prefix:	us-gaap_
Data Type:	srt-types:perUnitItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of right to receive cash collateral under master netting arrangements offset against derivative liabilities.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 7A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-7A

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-8

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483466/210-20-50-3

+ Details

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

- 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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 20
-Name Accounting Standards Codification
-Section 25
-Paragraph 6A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480682/815-20-25-6A

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480237/815-40-50-5

+ Details

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

- Definition

Nominal energy measure used to calculate payments on a derivative instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeNonmonetaryNotionalAmountEnergyMeasure
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:energyItemType
Balance Type:	na
Period Type:	duration

- Definition

Nominal volume used to calculate payments on a derivative instrument.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 181
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480401/815-10-55-181

+ Details

Name:	us-gaap_DerivativeNonmonetaryNotionalAmountVolume
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:volumeItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=ampy_NaturalGasDerivativeContractsFixedPriceSwap2025Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=ampy_NaturalGasDerivativeTwoWayCollarsContracts2025Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=ampy_CrudeOilDerivativeContractsFixedPriceSwap2025Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=ampy_CrudeOilDerivativeTwoWayCollarsContracts2025Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=ampy_NaturalGasDerivativeContractsFixedPriceSwap2026Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=ampy_NaturalGasDerivativeTwoWayCollarsContracts2026Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=ampy_CrudeOilDerivativeContractsFixedPriceSwap2026Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=ampy_NaturalGasDerivativeContractsFixedPriceSwap2027Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=ampy_NaturalGasDerivativeTwoWayCollarsContracts2027Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=ampy_CrudeOilDerivativeContractsFixedPriceSwap2027Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=ampy_NaturalGasDerivativeContractsFixedPriceSwap2028Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=ampy_NaturalGasDerivativeTwoWayCollarsContracts2028Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: