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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

Name:	atni_GainOnBargainPurchaseDeferredTax
Namespace Prefix:	atni_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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