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Revenue Recognition - Renewable Energy (Details) | 3 Months Ended
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Mar. 31, 2018
Minimum |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |
Term of power purchase agreements with various customers (in years) | 10 years
Maximum |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |
Term of power purchase agreements with various customers (in years) | 25 years

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- Definition Represents the term of power purchase agreements with various customers. + References No definition available. + Details
Name: | atni_PowerPurchaseAgreementsTerm
Namespace Prefix: | atni_
Data Type: | xbrli:durationItemType
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
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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
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |