Share-Based Compensation - Summary of Outstanding Activity of Options,Restricted Stock and Restricted Stock Units under MRI EICP (Detail)	12 Months Ended
Dec. 31, 2021 $ / shares shares
Restricted Shares [Member] \| MRI EICP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Beginning of period \| shares	0
Number of Shares, Granted \| shares	3,869,827
Number of Shares, Vested \| shares	(950,214)
Number of Shares, End of period \| shares	2,919,613
Weighted Average Grant Date Fair Value, Beginning of period \| $ / shares	$ 0
Weighted Average Grant Date Fair Value, Granted \| $ / shares	10.40
Weighted Average Grant Date Fair Value, Vested \| $ / shares	11.38
Weighted Average Grant Date Fair Value, End of period \| $ / shares	$ 10.09
Restricted Stock Units [Member] \| MRI EICP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Beginning of period \| shares	0
Number of Shares, Granted \| shares	29,304
Number of Shares, Forfeited \| shares	(1,320)
Number of Shares, End of period \| shares	27,984
Weighted Average Grant Date Fair Value, Beginning of period \| $ / shares	$ 0
Weighted Average Grant Date Fair Value, Granted \| $ / shares	11.38
Weighted Average Grant Date Fair Value, Forfeited \| $ / shares	11.38
Weighted Average Grant Date Fair Value, End of period \| $ / shares	$ 11.38
Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Beginning of period \| shares	0
Number of Shares, Vested \| shares	0
Number of Shares, Forfeited \| shares	0
Number of Shares, End of period \| shares
Weighted Average Grant Date Fair Value, Beginning of period \| $ / shares	$ 0
Weighted Average Grant Date Fair Value, Vested \| $ / shares	0
Weighted Average Grant Date Fair Value, Forfeited \| $ / shares	$ 0
Weighted Average Grant Date Fair Value, End of period \| $ / shares
Options [Member] \| MRI EICP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Granted \| shares	950,214
Number of Shares, End of period \| shares	950,214
Weighted Average Grant Date Fair Value, Granted \| $ / shares	$ 11.38
Weighted Average Grant Date Fair Value, End of period \| $ / shares	$ 11.38

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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=120381028&loc=d3e5070-113901

+ Details

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

- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(3)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

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

- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

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

- Definition

Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(2)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

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

- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(2)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
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

- Details

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

- Details

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

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_RestrictedStockUnitsRSUMember
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:

Share-Based Compensation - Summary of Outstanding Activity of Options,Restricted Stock and Restricted Stock Units under MRI EICP (Detail)	12 Months Ended
	Dec. 31, 2021 $ / shares shares
Restricted Shares [Member] \| MRI EICP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Beginning of period \| shares	0
Number of Shares, Granted \| shares	3,869,827
Number of Shares, Vested \| shares	(950,214)
Number of Shares, End of period \| shares	2,919,613
Weighted Average Grant Date Fair Value, Beginning of period \| $ / shares	$ 0
Weighted Average Grant Date Fair Value, Granted \| $ / shares	10.40
Weighted Average Grant Date Fair Value, Vested \| $ / shares	11.38
Weighted Average Grant Date Fair Value, End of period \| $ / shares	$ 10.09
Restricted Stock Units [Member] \| MRI EICP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Beginning of period \| shares	0
Number of Shares, Granted \| shares	29,304
Number of Shares, Forfeited \| shares	(1,320)
Number of Shares, End of period \| shares	27,984
Weighted Average Grant Date Fair Value, Beginning of period \| $ / shares	$ 0
Weighted Average Grant Date Fair Value, Granted \| $ / shares	11.38
Weighted Average Grant Date Fair Value, Forfeited \| $ / shares	11.38
Weighted Average Grant Date Fair Value, End of period \| $ / shares	$ 11.38
Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Beginning of period \| shares	0
Number of Shares, Vested \| shares	0
Number of Shares, Forfeited \| shares	0
Number of Shares, End of period \| shares
Weighted Average Grant Date Fair Value, Beginning of period \| $ / shares	$ 0
Weighted Average Grant Date Fair Value, Vested \| $ / shares	0
Weighted Average Grant Date Fair Value, Forfeited \| $ / shares	$ 0
Weighted Average Grant Date Fair Value, End of period \| $ / shares
Options [Member] \| MRI EICP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Granted \| shares	950,214
Number of Shares, End of period \| shares	950,214
Weighted Average Grant Date Fair Value, Granted \| $ / shares	$ 11.38
Weighted Average Grant Date Fair Value, End of period \| $ / shares	$ 11.38