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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, 2024 | Sep. 30, 2023
Mobility Fund [Line Items] |  |
Beginning balance, Total spend | $ 64,388 | $ 3,325
Amounts spent | 75,550 | 35,211
Ending balance, Total spend | 139,938 | 38,536
Beginning balance, Total reimbursements | (17,127) |
Reimbursements received | (87,189) | (1,948)
Ending balance, Total reimbursements | (104,316) | (1,948)
Amount pending reimbursement | 35,622 | 36,588
Capital Amount |  |
Mobility Fund [Line Items] |  |
Beginning balance, Total spend | 49,262 | 1,836
Amounts spent | 66,501 | 27,060
Ending balance, Total spend | 115,763 | 28,896
Beginning balance, Total reimbursements | (12,773) |
Reimbursements received | (68,450) | (833)
Ending balance, Total reimbursements | (81,223) | (833)
Amount pending reimbursement | 34,540 | 28,063
Operating Amount |  |
Mobility Fund [Line Items] |  |
Beginning balance, Total spend | 15,126 | 1,489
Amounts spent | 9,049 | 8,151
Ending balance, Total spend | 24,175 | 9,640
Beginning balance, Total reimbursements | (4,354) |
Reimbursements received | (18,739) | (1,115)
Ending balance, Total reimbursements | (23,093) | (1,115)
Amount pending reimbursement | $ 1,082 | $ 8,525

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: |