GOVERNMENT SUPPORT AND SPECTRUM MATTERS - Construction (Details) - Network Connectivity for Eligible Communities $ in Thousands	3 Months Ended
Mar. 31, 2024 USD ($)
Mobility Fund [Line Items]
Grants awarded	$ 100,149
Grants awarded	$ 100,149

Represents the amount of cumulative grant funds awarded.

No definition available.

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