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BASIS OF PRESENTATION (Details) (Reclassifications, General and administrative expense, USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014
Reclassifications | General and administrative expense |
Reclassifications |
Prior period reclassifications | $ 0.7

X
- Details
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Namespace Prefix: | atni_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of a reclassification adjustment made to prior period financial statement amounts. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration