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

X

- Details

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