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BASIS OF PRESENTATION (Details) (Reclassifications, General and administrative expense, USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014
Reclassifications | General and administrative expense
Reclassifications
Prior period reclassifications	$ 0.7

X

- Details

Name:	atni_PriorPeriodFinancialBalanceReclassificationLineItems
Namespace Prefix:	atni_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of a reclassification adjustment made to prior period financial statement amounts.

+ References

No definition available.

+ Details

Name:	us-gaap_PriorPeriodReclassificationAdjustment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration