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CONDENSED CONSOLIDATED INCOME STATEMENTS (Parenthetical) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
CONDENSED CONSOLIDATED INCOME STATEMENTS |  |  |  |
Net loss attributable to non-controlling interests, tax | $ 0.5 | $ 0.5 | $ 1.2 | $ 1.1

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- Definition This element represents the tax effect on the portion of income (loss) attributable to the non-controlling interest. + References No definition available. + Details
Name: | atni_NetIncomeAttributableToNoncontrollingInterestsTax
Namespace Prefix: | atni_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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