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GOVERNMENT SUPPORT AND SPECTRUM MATTERS - Construction (Details) $ in Thousands | 9 Months Ended
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Sep. 30, 2025 USD ($)
GOVERNMENT SUPPORT AND SPECTRUM MATTERS |
Grants awarded | $ 150,189
New grants | 16,097
Construction complete | (10,294)
Transferred and rescinded grants | 52,487
Grants awarded | 103,505
Broadband Equity, Access and Deployment Program grants |
GOVERNMENT SUPPORT AND SPECTRUM MATTERS |
Transferred and rescinded grants | $ 51,000

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- Definition Represents the amount of construction obligation completed. + References No definition available. + Details
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Namespace Prefix: | atni_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Represents the amount of grant funds awarded. + References No definition available. + Details
Name: | atni_GrantFundsAwarded
Namespace Prefix: | atni_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Represents the amount of cumulative grant funds awarded. + References No definition available. + Details
Name: | atni_GrantFundsCumulativeAwards
Namespace Prefix: | atni_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- 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- Definition Represents the amount of transferred and rescinded grants. + References No definition available. + Details
Name: | atni_TransferredAndRescindedGrants
Namespace Prefix: | atni_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |