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SUBSEQUENT EVENTS (Details) - Subsequent event - Commnet Wireless, LLC - Carrier Managed Services Master Agreement - Cellco Partnership d/b/a Verizon Wireless $ in Millions	May 10, 2023 USD ($) Options
Subsequent Event [Line Items]
Commitment period	7 years
Number of renewal options | Options	2
Renewal commitment period	3 years
Notice for non-renewal commitment period	12 months
Non-recurring costs for upgrades and construction | $	$ 200

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- Definition

Total amounts for both non-recurring costs for upgrades and construction receivable per the agreement.

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No definition available.

+ Details

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Namespace Prefix:	atni_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Definition

Commitment period under arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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No definition available.

+ Details

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Namespace Prefix:	atni_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Period of time for non-renewal commitment period under arrangement.

+ References

No definition available.

+ Details

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Namespace Prefix:	atni_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of options for renewal of commitment period under arrangement.

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No definition available.

+ Details

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Namespace Prefix:	atni_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Renewed commitment period under arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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No definition available.

+ Details

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Namespace Prefix:	atni_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- 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.

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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:
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Period Type:

X

- Details

Name:	srt_ConsolidatedEntitiesAxis=atni_CommnetWirelessLlcMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TypeOfArrangementAxis=atni_CarrierManagedServicesMasterAgreementMember
Namespace Prefix:
Data Type:	na
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Period Type:

X

- Details

Name:	srt_CounterpartyNameAxis=atni_CellcoPartnershipDbaVerizonWirelessMember
Namespace Prefix:
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Balance Type:
Period Type: