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CONDENSED CONSOLIDATED INCOME STATEMENTS (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
CONDENSED CONSOLIDATED INCOME STATEMENTS
Net loss attributable to non-controlling interests, tax	$ 0.6	$ 0.4

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

X

- Details

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