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GOVERNMENT SUPPORT AND SPECTRUM MATTERS - Construction (Details) - Network Connectivity for Eligible Communities $ in Thousands	9 Months Ended
	Sep. 30, 2024 USD ($)
Mobility Fund [Line Items]
Grants awarded	$ 100,149
New grants	0
Construction complete	0
Transferred grants	0
Grants awarded	$ 100,149

X

- Definition

Represents the amount of construction obligation completed.

+ References

No definition available.

+ Details

Name:	atni_ConstructionObligationCompleted
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

Represents the amount of grant funds transferred.

+ References

No definition available.

+ Details

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

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

- Details

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