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Cover - USD ($)
 12 Months Ended
Dec. 31, 2023
Mar. 15, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K/A    
Amendment Flag false    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Dec. 31, 2023    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2023    
Current Fiscal Year End Date --12-31    
Entity File Number 001-12593    
Entity Registrant Name ATN INTERNATIONAL, INC.    
Entity Central Index Key 0000879585    
Entity Tax Identification Number 47-0728886    
Entity Incorporation, State or Country Code DE    
Entity Address, Address Line One 500 Cummings Center    
Entity Address, City or Town Beverly    
Entity Address, State or Province MA    
Entity Address, Postal Zip Code 01915    
City Area Code 978    
Local Phone Number 619-1300    
Title of 12(b) Security Common Stock, par value $.01 per share    
Trading Symbol ATNI    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 394
Entity Common Stock, Shares Outstanding   15,481,207  
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Auditor Firm ID 238    
Auditor Name PRICEWATERHOUSECOOPERS LLP    
Auditor Location BOSTON, MASSACHUSETTS