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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Risk (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) customer	Dec. 31, 2023 USD ($) customer
Replace and Remove Program
Credit concentrations and significant customers
Grants receivable | $	$ 37.7	$ 47.3
Revenue Benchmark [Member] | Customer Concentration Risk [Member]
Credit concentrations and significant customers
Number of customers	0	0
Accounts Receivable [Member] | Customer Concentration Risk [Member]
Credit concentrations and significant customers
Number of customers	0	0

X

- Definition

Represents the number customers of the entity from which revenue was earned.

+ References

No definition available.

+ Details

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Namespace Prefix:	atni_
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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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 954
-SubTopic 310
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478785/954-310-50-2

+ Details

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- Definition

Carrying amount as of the balance sheet date of amounts due under the terms of governmental, corporate, or foundation grants.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3)(a)(4))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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- Details

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- Details

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- Details

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- Details

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