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EARNINGS PER SHARE AND REDEEMABLE NONCONTROLLING INTERESTS - Computation (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Numerator:
Net loss attributable to ATN International, Inc. stockholders- Basic	$ 4,343	$ (32,691)	$ (11,611)	$ (30,000)
Less: Preferred dividends	(1,558)	(1,426)	(4,523)	(4,154)
Net loss attributable to ATN International, Inc. common stockholders- Diluted	$ 2,785	$ (34,117)	$ (16,134)	$ (34,154)
Denominator:
Weighted-average shares outstanding- Basic	15,257	15,114	15,204	15,268
Weighted-average shares outstanding- Diluted	15,267	15,114	15,204	15,268

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