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GOVERNMENT SUPPORT AND SPECTRUM MATTERS - Construction (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2025 USD ($)
GOVERNMENT SUPPORT AND SPECTRUM MATTERS
Grants awarded	$ 150,189
New grants	16,097
Construction complete	(10,294)
Transferred and rescinded grants	52,487
Grants awarded	103,505
Broadband Equity, Access and Deployment Program grants
GOVERNMENT SUPPORT AND SPECTRUM MATTERS
Transferred and rescinded grants	$ 51,000

X

- Definition

Represents the amount of construction obligation completed.

+ References

No definition available.

+ Details

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Namespace Prefix:	atni_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Represents the amount of grant funds awarded.

+ References

No definition available.

+ Details

Name:	atni_GrantFundsAwarded
Namespace Prefix:	atni_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Represents the amount of cumulative grant funds awarded.

+ References

No definition available.

+ Details

Name:	atni_GrantFundsCumulativeAwards
Namespace Prefix:	atni_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

N/a

+ References

No definition available.

+ Details

Name:	atni_MobilityFundLineItems
Namespace Prefix:	atni_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the amount of transferred and rescinded grants.

+ References

No definition available.

+ Details

Name:	atni_TransferredAndRescindedGrants
Namespace Prefix:	atni_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	atni_GovernmentGrantsAxis=atni_BroadbandEquityAccessAndDeploymentProgramMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: