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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 | $ 1,102,000 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax | $ 1,905,000 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax | $ 305,197,000 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax | $ 1,102,000 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax | $ 307,102,000 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax |
Alltel Sale | AT&T Mobility |  |  |  |  |  |
Pending Sale Of U.S. Retail Wireless Business |  |  |  |  |  |
Consideration for sale of operations in all-cash transaction |  |  |  |  |  | 780,000,000 us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = atni_USRetailWirelessBusinessMember / dei_LegalEntityAxis = atni_ATAndTMobilityLLCMember
Working capital |  |  |  |  | 16,828,000 atni_DisposalGroupIncludingDiscontinuedOperationWorkingCapitalProceeds / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = atni_USRetailWirelessBusinessMember / dei_LegalEntityAxis = atni_ATAndTMobilityLLCMember | 16,800,000 atni_DisposalGroupIncludingDiscontinuedOperationWorkingCapitalProceeds / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = atni_USRetailWirelessBusinessMember / dei_LegalEntityAxis = atni_ATAndTMobilityLLCMember
Gain (loss) on sale of assets |  |  |  | $ 1,100,000 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = atni_USRetailWirelessBusinessMember / dei_LegalEntityAxis = atni_ATAndTMobilityLLCMember | $ 307,102,000 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = atni_USRetailWirelessBusinessMember / dei_LegalEntityAxis = atni_ATAndTMobilityLLCMember |

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