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SUBSEQUENT EVENTS (Details) - Subsequent event - Commnet Wireless, LLC - Carrier Managed Services Master Agreement - Cellco Partnership d/b/a Verizon Wireless $ in Millions | May 10, 2023 USD ($) Options
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Subsequent Event [Line Items] |
Commitment period | 7 years
Number of renewal options | Options | 2
Renewal commitment period | 3 years
Notice for non-renewal commitment period | 12 months
Non-recurring costs for upgrades and construction | $ | $ 200

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- Definition Total amounts for both non-recurring costs for upgrades and construction receivable per the agreement. + References No definition available. + Details
Name: | atni_CollaborativeArrangementAmountReceivable
Namespace Prefix: | atni_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Commitment period under arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | atni_CollaborativeArrangementCommitmentPeriod
Namespace Prefix: | atni_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Period of time for non-renewal commitment period under arrangement. + References No definition available. + Details
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Namespace Prefix: | atni_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of options for renewal of commitment period under arrangement. + References No definition available. + Details
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Namespace Prefix: | atni_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Renewed commitment period under arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | atni_CollaborativeArrangementRenewalCommitmentPeriod
Namespace Prefix: | atni_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_ConsolidatedEntitiesAxis=atni_CommnetWirelessLlcMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_TypeOfArrangementAxis=atni_CarrierManagedServicesMasterAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_CounterpartyNameAxis=atni_CellcoPartnershipDbaVerizonWirelessMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |