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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Details) (Interest rate derivative, USD $) In Millions, unless otherwise specified | 0 Months Ended
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Sep. 20, 2013
Interest rate derivative |
Derivative instruments and hedging activities |
Payment made to counterparties for termination of derivatives | $ 5.4 atni_PaymentsToTerminateDerivatives / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember

X
- Definition The settlement price on the termination of derivative instruments. + References No definition available. + Details
Name: | atni_PaymentsToTerminateDerivatives
Namespace Prefix: | atni_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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