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COMMITMENTS AND CONTINGENCIES (Details) (USD $) In Millions, unless otherwise specified | 0 Months Ended
--- | ---
Jan. 02, 2014 | May 01, 2014 Subsequent event
Commitments and contingencies |  |
Renewal fee of telecommunications license | $ 4 |
Amount of overdue spectrum fees demanded by the government of Aruba be paid by May 1, 2014 |  | $ 1

X
- Definition Represents the amount of overdue spectrum fees demanded by the government of Aruba be paid by a specified date. + References No definition available. + Details
Name: | atni_LossContingencyOverdueSpectrumFeesDemandedWithinSpecificDate
Namespace Prefix: | atni_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the amount of renewal fee of telecommunications license. + References No definition available. + Details
Name: | atni_LossContingencyRenewalFeeOfTelecommunicationsLicense
Namespace Prefix: | atni_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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