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GOVERNMENT SUPPORT AND SPECTRUM MATTERS - Replace and Remove Program (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Remove And Replace Program |  |
Mobility Fund [Line Items] |  |
Beginning balance, Total spend | $ 64,388 | $ 3,325
Amounts spent | 16,302 | 3,385
Ending balance, Total spend | 80,690 | 6,710
Beginning balance, Total reimbursements | (17,127) |
Reimbursements received | (14,429) |
Ending balance, Total reimbursements | (31,556) |
Amount pending reimbursement | 49,134 | 6,710
Capital Amount |  |
Mobility Fund [Line Items] |  |
Beginning balance, Total spend | 49,262 | 1,836
Amounts spent | 11,734 | 1,485
Ending balance, Total spend | 60,996 | 3,321
Beginning balance, Total reimbursements | (12,773) |
Reimbursements received | (8,586) |
Ending balance, Total reimbursements | (21,359) |
Amount pending reimbursement | 39,637 | 3,321
Operating Amount |  |
Mobility Fund [Line Items] |  |
Beginning balance, Total spend | 15,126 | 1,489
Amounts spent | 4,568 | 1,900
Ending balance, Total spend | 19,694 | 3,389
Beginning balance, Total reimbursements | (4,354) |
Reimbursements received | (5,843) |
Ending balance, Total reimbursements | (10,197) |
Amount pending reimbursement | $ 9,497 | $ 3,389

X
- Definition Amount of cash outflow for government grant during the period. + References No definition available. + Details
Name: | atni_GovernmentGrantAmountSpent
Namespace Prefix: | atni_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of government grant spent to date. + References No definition available. + Details
Name: | atni_GovernmentGrantAmountSpentToDate
Namespace Prefix: | atni_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of cash inflow from reimbursements received during the period. + References No definition available. + Details
Name: | atni_GovernmentGrantReimbursementsReceived
Namespace Prefix: | atni_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Total amount of reimbursement till date. + References No definition available. + Details
Name: | atni_GovernmentGrantTotalReimbursements
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 Amount of receivable for cost incurred that will be reimbursed. + References No definition available. + Details
Name: | atni_ReimbursementReceivable
Namespace Prefix: | atni_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | atni_GovernmentGrantsAxis=atni_RemoveAndReplaceProgramMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | atni_GovernmentGrantsAxis=atni_CapitalAmountMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | atni_GovernmentGrantsAxis=atni_OperatingAmountMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |