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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 2) (USD $)	3 Months Ended			12 Months Ended		0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2014	Dec. 31, 2013	Sep. 20, 2013
Pending Sale Of U.S. Retail Wireless Business
Gain (loss) on sale of assets	$ 1,102,000us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	$ 1,905,000us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	$ 305,197,000us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	$ 1,102,000us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	$ 307,102,000us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
Alltel Sale | AT&T Mobility
Pending Sale Of U.S. Retail Wireless Business
Consideration for sale of operations in all-cash transaction						780,000,000us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = atni_USRetailWirelessBusinessMember / dei_LegalEntityAxis = atni_ATAndTMobilityLLCMember
Working capital					16,828,000atni_DisposalGroupIncludingDiscontinuedOperationWorkingCapitalProceeds / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = atni_USRetailWirelessBusinessMember / dei_LegalEntityAxis = atni_ATAndTMobilityLLCMember	16,800,000atni_DisposalGroupIncludingDiscontinuedOperationWorkingCapitalProceeds / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = atni_USRetailWirelessBusinessMember / dei_LegalEntityAxis = atni_ATAndTMobilityLLCMember
Gain (loss) on sale of assets				$ 1,100,000us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = atni_USRetailWirelessBusinessMember / dei_LegalEntityAxis = atni_ATAndTMobilityLLCMember	$ 307,102,000us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = atni_USRetailWirelessBusinessMember / dei_LegalEntityAxis = atni_ATAndTMobilityLLCMember

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 20

-Section 45

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759



Reference 2: http://www.xbrl.org/2003/role/presentationRef

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