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CONSOLIDATED INCOME STATEMENTS (Parenthetical) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
CONSOLIDATED INCOME STATEMENTS |  |  |
Gain on bargain purchase, deferred taxes |  | $ 18,016,000 |
Net (income)loss attributable to non-controlling interests, tax | $ 2,400,000 | $ 1,900,000 | $ 2,800,000

X
- Definition The deferred tax effect of gains from a business combination in which the amount of net identifiable assets acquired and liabilities assumed exceeds the aggregate consideration transferred or to be transferred. + References No definition available. + Details
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Namespace Prefix: | atni_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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