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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Risk (Details) - Customer concentration - customer | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Revenues. |  |  |
Credit concentrations and significant customers |  |  |
Number of customers | 0 | 0 | 1
Accounts receivable |  |  |
Credit concentrations and significant customers |  |  |
Number of customers | 2 | 0 |

X
- Definition Represents the number customers of the entity from which revenue was earned. + References No definition available. + Details
Name: | atni_ConcentrationRiskNumberOfCustomers
Namespace Prefix: | atni_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ConcentrationRiskLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_SalesRevenueNetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConcentrationRiskByTypeAxis=us-gaap_CustomerConcentrationRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_AccountsReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |