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SUBSEQUENT EVENT (Details) - Subsequent event - U.S. Telecom | 3 Months Ended
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Mar. 31, 2018 item
SUBSEQUENT EVENT |
Number of buildout arrangements with exercised option to purchase sites | 1
Cell sites within buildout arrangement | 100

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- Definition Number of buildout arrangements with option to purchase sites, which was exercised during the period. + References No definition available. + Details
Name: | atni_NumberOfBuildoutArrangementWithOptionToPurchaseSitesExercised
Namespace Prefix: | atni_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of cell sites within buildout arrangement. + References No definition available. + Details
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Namespace Prefix: | atni_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=atni_UsTelecommunicationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |