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BASIS OF PRESENTATION (Details) (Reclassifications, USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2012 | Jun. 30, 2012
Wireline revenue |  |
Reclassifications |  |
Prior period reclassifications | $ (0.2) | $ (0.4)
Termination and access fees |  |
Reclassifications |  |
Prior period reclassifications | 0.2 | 0.4
Engineering and operations expense |  |
Reclassifications |  |
Prior period reclassifications | (0.8) | (1.6)
General and administrative expense |  |
Reclassifications |  |
Prior period reclassifications | $ 0.8 | $ 1.6

X
- Details
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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