XML 31 R52.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition (Details) | 12 Months Ended
--- | ---
Dec. 31, 2019
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |
Retail revenue period for billing postpaid customers in advance | 1 month
Expected amortization period, when the Company utilizes the practical expedient and expenses the costs as incurred | true
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
Renewable Energy | Minimum |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |
Amortization period | 2 years
Renewable Energy | Maximum |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |
Amortization period | 6 years

X
- Definition Represents the period for billing postpaid customers in advance for retail revenue. + References No definition available. + Details
Name: | atni_PeriodForRetailRevenueBilledInAdvanceForPostpaidCustomers
Namespace Prefix: | atni_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- 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 The period amortization for asset recognized from payment of sales commission. + References No definition available. + Details
Name: | atni_SaleCommissionCapitalizedAmortizationPeriod
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
Name: | us-gaap_RevenueInitialApplicationPeriodCumulativeEffectTransitionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Indicates (true false) whether practical expedient was elected to recognize incremental cost of obtaining contract as expense when incurred if amortization period would have been one year or less. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL51790836-203054 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130569-203045 + Details
Name: | us-gaap_RevenuePracticalExpedientIncrementalCostOfObtainingContract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:booleanItemType
Balance Type: | na
Period Type: | duration

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

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

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