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CONDENSED CONSOLIDATED INCOME STATEMENTS (Parenthetical) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
CONDENSED CONSOLIDATED INCOME STATEMENTS
Gain on bargain purchase, taxes		$ 18,016,000		$ 18,016,000
Net loss attributable to non-controlling interests, tax	$ 600,000	$ 500,000	$ 1,400,000	$ 1,800,000

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.

+ Details

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Period Type:	duration

X

- Definition

This element represents the tax effect on the portion of income (loss) attributable to the non-controlling interest.

+ 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
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