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CONDENSED CONSOLIDATED INCOME STATEMENTS (Parenthetical) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
CONDENSED CONSOLIDATED INCOME STATEMENTS |  |
Net loss (income) attributable to non-controlling interests, tax | $ 0.7 | $ 0.6

X
- 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