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GOVERNMENT SUPPORT AND SPECTRUM MATTERS - Replace and Remove Program (Details) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024
GOVERNMENT SUPPORT AND SPECTRUM MATTERS |  |
Beginning balance, Total spend | $ 168,395 | $ 64,388
Amounts spent | 45,309 | 75,550
Ending balance, Total spend | 213,704 | 139,938
Beginning balance, Total reimbursements | (130,721) | (17,127)
Reimbursements received | (57,684) | (87,189)
Ending balance, Total reimbursements | (188,405) | (104,316)
Amount pending reimbursement | 25,299 | 35,622
Capital Amount |  |
GOVERNMENT SUPPORT AND SPECTRUM MATTERS |  |
Beginning balance, Total spend | 140,949 | 49,262
Amounts spent | 36,445 | 66,501
Ending balance, Total spend | 177,394 | 115,763
Beginning balance, Total reimbursements | (103,540) | (12,773)
Reimbursements received | (48,555) | (68,450)
Ending balance, Total reimbursements | (152,095) | (81,223)
Amount pending reimbursement | 25,299 | 34,540
Operating Amount |  |
GOVERNMENT SUPPORT AND SPECTRUM MATTERS |  |
Beginning balance, Total spend | 27,446 | 15,126
Amounts spent | 8,864 | 9,049
Ending balance, Total spend | 36,310 | 24,175
Beginning balance, Total reimbursements | (27,181) | (4,354)
Reimbursements received | (9,129) | (18,739)
Ending balance, Total reimbursements | $ (36,310) | (23,093)
Amount pending reimbursement |  | $ 1,082

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: |