v3.19.2
Document and Entity Information - shares
6 Months Ended
Jun. 30, 2019
Aug. 07, 2019
Document and Entity Information    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2019  
Document Transition Report false  
Entity File Number 001-12593  
Entity Registrant Name ATN INTERNATIONAL, INC.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 47-0728886  
Entity Address, Address Line One 500 Cummings Center, Suite 2450  
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 Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   16,004,810
Entity Central Index Key 0000879585  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q2  
Amendment Flag false