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GOVERNMENT SUPPORT AND SPECTRUM MATTERS - Replace and Remove Program (Details) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2024 | Jun. 30, 2023
Mobility Fund [Line Items] |  |
Beginning balance, Total spend | $ 64,388 | $ 3,325
Amounts spent | 47,654 | 17,705
Ending balance, Total spend | 112,042 | 21,030
Beginning balance, Total reimbursements | (17,127) |
Reimbursements received | (52,142) |
Ending balance, Total reimbursements | (69,269) |
Amount pending reimbursement | 42,773 | 21,030
Capital Amount |  |
Mobility Fund [Line Items] |  |
Beginning balance, Total spend | 49,262 | 1,836
Amounts spent | 38,126 | 12,739
Ending balance, Total spend | 87,388 | 14,575
Beginning balance, Total reimbursements | (12,773) |
Reimbursements received | (41,421) |
Ending balance, Total reimbursements | (54,194) |
Amount pending reimbursement | 33,194 | 14,575
Operating Amount |  |
Mobility Fund [Line Items] |  |
Beginning balance, Total spend | 15,126 | 1,489
Amounts spent | 9,528 | 4,966
Ending balance, Total spend | 24,654 | 6,455
Beginning balance, Total reimbursements | (4,354) |
Reimbursements received | (10,721) |
Ending balance, Total reimbursements | (15,075) |
Amount pending reimbursement | $ 9,579 | $ 6,455

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: |