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GOVERNMENT SUPPORT AND SPECTRUM PROGRAMS - Construction (Details) - Network Connectivity for Eligible Communities $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($)
Mobility Fund [Line Items]
Grants awarded	$ 11,067
New grants	73,384
Cancelled grants	(4,254)
Grants awarded	$ 80,197

X

- Definition

Represents the amount of grant funds awarded.

+ References

No definition available.

+ Details

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Namespace Prefix:	atni_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Represents the amount of grant funds cancelled.

+ References

No definition available.

+ Details

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Namespace Prefix:	atni_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Represents the amount of cumulative grant funds awarded.

+ References

No definition available.

+ Details

Name:	atni_GrantFundsCumulativeAwards
Namespace Prefix:	atni_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

N/a

+ References

No definition available.

+ Details

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Namespace Prefix:	atni_
Data Type:	xbrli:stringItemType
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X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: