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COMMITMENTS AND CONTINGENCIES (Details) (Commitment to provide domestic fixed services and international voice and data services, Guyana) | 12 Months Ended
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Dec. 31, 2012
Commitment to provide domestic fixed services and international voice and data services | Guyana |
Commitments and contingencies |
Initial term of license | 20 years
Period for optional extension of license term | 20 years

X
- Definition Represents the initial term of the license issued to provide services. + References No definition available. + Details
Name: | atni_SupplyCommitmentInitialTermOfLicence
Namespace Prefix: | atni_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the period for which the license term can be extended at the option of the entity. + References No definition available. + Details
Name: | atni_SupplyCommitmentPeriodAvailableUnderOptionsForLicenceExtension
Namespace Prefix: | atni_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_SupplyCommitmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration