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GOVERNMENT SUPPORT AND SPECTRUM MATTERS - Construction (Details) - Network Connectivity for Eligible Communities $ in Thousands | 12 Months Ended
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Dec. 31, 2024 USD ($)
Mobility Fund [Line Items] |
Grants awarded | $ 100,149
New grants | 52,093
Construction complete | (2,053)
Grants awarded | $ 150,189

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 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: |