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GOVERNMENT SUPPORT AND SPECTRUM MATTERS - Replace and Remove Program (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Mobility Fund [Line Items] |  |
Beginning balance, Total spend | $ 64,388 | $ 3,325
Amounts spent | 104,007 | 61,063
Ending balance, Total spend | 168,395 | 64,388
Beginning balance, Total reimbursements | (17,127) |
Reimbursements received | (113,594) | (17,127)
Ending balance, Total reimbursements | (130,721) | (17,127)
Amount pending reimbursement | 37,674 | 47,261
Capital Amount |  |
Mobility Fund [Line Items] |  |
Beginning balance, Total spend | 49,262 | 1,836
Amounts spent | 91,687 | 47,426
Ending balance, Total spend | 140,949 | 49,262
Beginning balance, Total reimbursements | (12,773) |
Reimbursements received | (90,767) | (12,773)
Ending balance, Total reimbursements | (103,540) | (12,773)
Amount pending reimbursement | 37,409 | 36,489
Operating Amount |  |
Mobility Fund [Line Items] |  |
Beginning balance, Total spend | 15,126 | 1,489
Amounts spent | 12,320 | 13,637
Ending balance, Total spend | 27,446 | 15,126
Beginning balance, Total reimbursements | (4,354) |
Reimbursements received | (22,827) | (4,354)
Ending balance, Total reimbursements | (27,181) | (4,354)
Amount pending reimbursement | $ 265 | $ 10,772

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_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: |