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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition (Details) | 12 Months Ended
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Dec. 31, 2018
Minimum |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |
Amortization period | 2 years
Maximum |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |
Amortization period | 6 years
Renewable Energy | Minimum |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |
Term of power purchase agreements with various customers (in years) | 10 years
Renewable Energy | 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
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Namespace Prefix: | atni_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The period amortization for asset recognized from payment of sales commission. + References No definition available. + Details
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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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Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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