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DISCONTINUED OPERATIONS - SALE OF U.S. RETAIL WIRELESS BUSINESS (Details) - 10K (USD $)
3 Months Ended 12 Months Ended 0 Months Ended 3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Sep. 20, 2013
Mar. 31, 2015
Proceeds:                    
Current assets $ 451,374,000us-gaap_AssetsCurrent $ 472,003,000us-gaap_AssetsCurrent       $ 451,374,000us-gaap_AssetsCurrent $ 472,003,000us-gaap_AssetsCurrent      
Property, plant and equipment, net 369,582,000us-gaap_PropertyPlantAndEquipmentNet 254,632,000us-gaap_PropertyPlantAndEquipmentNet       369,582,000us-gaap_PropertyPlantAndEquipmentNet 254,632,000us-gaap_PropertyPlantAndEquipmentNet      
Telecommunication licenses 44,090,000us-gaap_IndefiniteLivedLicenseAgreements 39,687,000us-gaap_IndefiniteLivedLicenseAgreements       44,090,000us-gaap_IndefiniteLivedLicenseAgreements 39,687,000us-gaap_IndefiniteLivedLicenseAgreements      
Other assets 7,519,000us-gaap_OtherAssetsNoncurrent 7,096,000us-gaap_OtherAssetsNoncurrent       7,519,000us-gaap_OtherAssetsNoncurrent 7,096,000us-gaap_OtherAssetsNoncurrent      
Liabilities sold:                    
Current liabilities (104,069,000)us-gaap_LiabilitiesCurrent (121,073,000)us-gaap_LiabilitiesCurrent       (104,069,000)us-gaap_LiabilitiesCurrent (121,073,000)us-gaap_LiabilitiesCurrent      
Other liabilities (19,619,000)us-gaap_OtherLiabilitiesNoncurrent (12,784,000)us-gaap_OtherLiabilitiesNoncurrent       (19,619,000)us-gaap_OtherLiabilitiesNoncurrent (12,784,000)us-gaap_OtherLiabilitiesNoncurrent      
Net gain on sale 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      
Restricted cash, current 39,703,000us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue 39,000,000us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue       39,703,000us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue 39,000,000us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue      
Restricted cash, long-term 5,475,000us-gaap_RestrictedCashAndCashEquivalentsNoncurrent 39,000,000us-gaap_RestrictedCashAndCashEquivalentsNoncurrent       5,475,000us-gaap_RestrictedCashAndCashEquivalentsNoncurrent 39,000,000us-gaap_RestrictedCashAndCashEquivalentsNoncurrent      
Impairment of intangible assets           0us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill 0us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill      
Minority shareholders' interests in sale of operations   200,000us-gaap_ExtraordinaryItemGainOrLossNetOfTaxAttributableToNoncontrollingInterest 28,699,000us-gaap_ExtraordinaryItemGainOrLossNetOfTaxAttributableToNoncontrollingInterest       28,899,000us-gaap_ExtraordinaryItemGainOrLossNetOfTaxAttributableToNoncontrollingInterest      
Amount distributed to minority shareholders           16,331,000us-gaap_PaymentsOfDividendsMinorityInterest 26,155,000us-gaap_PaymentsOfDividendsMinorityInterest 2,458,000us-gaap_PaymentsOfDividendsMinorityInterest    
Amount included in non-controlling interests 60,960,000us-gaap_MinorityInterest 56,525,000us-gaap_MinorityInterest       60,960,000us-gaap_MinorityInterest 56,525,000us-gaap_MinorityInterest      
Revenues and income from discontinued operations                    
Income from discontinued operations, net of tax expense (benefit) of $1,967, $13,816 and $2,512 respectively     (1,960,000)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax 3,092,000us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax 4,034,000us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax   5,166,000us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax 29,202,000us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax    
AT&T Mobility | Alltel Wireless                    
SALE OF U.S. RETAIL WIRELESS BUSINESS                    
Consideration for sale of operations in all-cash transaction                 780,000,000us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds
/ us-gaap_BusinessAcquisitionAxis
= atni_AlltelWirelessMember
/ dei_LegalEntityAxis
= atni_ATAndTMobilityLLCMember
 
AT&T Mobility | Trade names | Alltel Wireless                    
Liabilities sold:                    
Impairment of intangible assets             11,900,000us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill
/ us-gaap_BusinessAcquisitionAxis
= atni_AlltelWirelessMember
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
/ dei_LegalEntityAxis
= atni_ATAndTMobilityLLCMember
     
Alltel Sale | AT&T Mobility                    
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
 
Proceeds:                    
Received             702,000,000atni_ProceedsReceivedFromDivestitureOfBusinesses
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= atni_USRetailWirelessBusinessMember
/ dei_LegalEntityAxis
= atni_ATAndTMobilityLLCMember
     
Escrowed             78,000,000atni_DisposalGroupIncludingDiscontinuedOperationEscrowedCash
/ 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
 
Adjusted proceeds             796,828,000us-gaap_ProceedsFromDivestitureOfBusinesses
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= atni_USRetailWirelessBusinessMember
/ dei_LegalEntityAxis
= atni_ATAndTMobilityLLCMember
     
Current assets   51,597,000us-gaap_AssetsCurrent
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= atni_USRetailWirelessBusinessMember
/ dei_LegalEntityAxis
= atni_ATAndTMobilityLLCMember
        51,597,000us-gaap_AssetsCurrent
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= atni_USRetailWirelessBusinessMember
/ dei_LegalEntityAxis
= atni_ATAndTMobilityLLCMember
     
Property, plant and equipment, net   190,970,000us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= atni_USRetailWirelessBusinessMember
/ dei_LegalEntityAxis
= atni_ATAndTMobilityLLCMember
        190,970,000us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= atni_USRetailWirelessBusinessMember
/ dei_LegalEntityAxis
= atni_ATAndTMobilityLLCMember
     
Telecommunication licenses   50,553,000us-gaap_IndefiniteLivedLicenseAgreements
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= atni_USRetailWirelessBusinessMember
/ dei_LegalEntityAxis
= atni_ATAndTMobilityLLCMember
        50,553,000us-gaap_IndefiniteLivedLicenseAgreements
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= atni_USRetailWirelessBusinessMember
/ dei_LegalEntityAxis
= atni_ATAndTMobilityLLCMember
     
Other intangible assets   37,434,000us-gaap_OtherIntangibleAssetsNet
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= atni_USRetailWirelessBusinessMember
/ dei_LegalEntityAxis
= atni_ATAndTMobilityLLCMember
        37,434,000us-gaap_OtherIntangibleAssetsNet
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= atni_USRetailWirelessBusinessMember
/ dei_LegalEntityAxis
= atni_ATAndTMobilityLLCMember
     
Other assets   13,202,000us-gaap_OtherAssetsNoncurrent
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= atni_USRetailWirelessBusinessMember
/ dei_LegalEntityAxis
= atni_ATAndTMobilityLLCMember
        13,202,000us-gaap_OtherAssetsNoncurrent
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= atni_USRetailWirelessBusinessMember
/ dei_LegalEntityAxis
= atni_ATAndTMobilityLLCMember
     
Liabilities sold:                    
Current liabilities   (40,674,000)us-gaap_LiabilitiesCurrent
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= atni_USRetailWirelessBusinessMember
/ dei_LegalEntityAxis
= atni_ATAndTMobilityLLCMember
        (40,674,000)us-gaap_LiabilitiesCurrent
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= atni_USRetailWirelessBusinessMember
/ dei_LegalEntityAxis
= atni_ATAndTMobilityLLCMember
     
Other liabilities   (22,796,000)us-gaap_OtherLiabilitiesNoncurrent
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= atni_USRetailWirelessBusinessMember
/ dei_LegalEntityAxis
= atni_ATAndTMobilityLLCMember
        (22,796,000)us-gaap_OtherLiabilitiesNoncurrent
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= atni_USRetailWirelessBusinessMember
/ dei_LegalEntityAxis
= atni_ATAndTMobilityLLCMember
     
Net assets sold or impaired   280,286,000atni_DisposalGroupIncludingDiscontinuedOperationNetAssets
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= atni_USRetailWirelessBusinessMember
/ dei_LegalEntityAxis
= atni_ATAndTMobilityLLCMember
        280,286,000atni_DisposalGroupIncludingDiscontinuedOperationNetAssets
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= atni_USRetailWirelessBusinessMember
/ dei_LegalEntityAxis
= atni_ATAndTMobilityLLCMember
     
Less: Transaction related costs             (13,517,000)atni_DisposalGroupIncludingDiscontinuedOperationTransactionCosts
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= atni_USRetailWirelessBusinessMember
/ dei_LegalEntityAxis
= atni_ATAndTMobilityLLCMember
     
Pre-tax gain             503,025,000us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= atni_USRetailWirelessBusinessMember
/ dei_LegalEntityAxis
= atni_ATAndTMobilityLLCMember
     
Less: Income taxes at effective rate             195,923,000us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDisposalOfDiscontinuedOperation
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= atni_USRetailWirelessBusinessMember
/ dei_LegalEntityAxis
= atni_ATAndTMobilityLLCMember
     
Net gain on sale           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
     
First release of amount of escrowed cash           39,000,000atni_DisposalGroupIncludingDiscontinuedOperationAmountOfFirstReleaseOfEscrowedCash
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= atni_USRetailWirelessBusinessMember
/ dei_LegalEntityAxis
= atni_ATAndTMobilityLLCMember
       
Second release of amount of escrowed cash                   39,000,000atni_DisposalGroupIncludingDiscontinuedOperationAmountOfSecondReleaseOfEscrowedCash
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= atni_USRetailWirelessBusinessMember
/ dei_LegalEntityAxis
= atni_ATAndTMobilityLLCMember
Restricted cash   78,000,000us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= atni_USRetailWirelessBusinessMember
/ dei_LegalEntityAxis
= atni_ATAndTMobilityLLCMember
        78,000,000us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= atni_USRetailWirelessBusinessMember
/ dei_LegalEntityAxis
= atni_ATAndTMobilityLLCMember
     
Restricted cash, current 39,000,000us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= atni_USRetailWirelessBusinessMember
/ dei_LegalEntityAxis
= atni_ATAndTMobilityLLCMember
39,000,000us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= atni_USRetailWirelessBusinessMember
/ dei_LegalEntityAxis
= atni_ATAndTMobilityLLCMember
      39,000,000us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= atni_USRetailWirelessBusinessMember
/ dei_LegalEntityAxis
= atni_ATAndTMobilityLLCMember
39,000,000us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= atni_USRetailWirelessBusinessMember
/ dei_LegalEntityAxis
= atni_ATAndTMobilityLLCMember
     
Restricted cash, long-term   39,000,000us-gaap_RestrictedCashAndCashEquivalentsNoncurrent
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= atni_USRetailWirelessBusinessMember
/ dei_LegalEntityAxis
= atni_ATAndTMobilityLLCMember
        39,000,000us-gaap_RestrictedCashAndCashEquivalentsNoncurrent
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= atni_USRetailWirelessBusinessMember
/ dei_LegalEntityAxis
= atni_ATAndTMobilityLLCMember
     
Minority shareholders' interests in sale of operations           28,900,000us-gaap_ExtraordinaryItemGainOrLossNetOfTaxAttributableToNoncontrollingInterest
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= atni_USRetailWirelessBusinessMember
/ dei_LegalEntityAxis
= atni_ATAndTMobilityLLCMember
       
Amount distributed to minority shareholders           5,800,000us-gaap_PaymentsOfDividendsMinorityInterest
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= atni_USRetailWirelessBusinessMember
/ dei_LegalEntityAxis
= atni_ATAndTMobilityLLCMember
18,900,000us-gaap_PaymentsOfDividendsMinorityInterest
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= atni_USRetailWirelessBusinessMember
/ dei_LegalEntityAxis
= atni_ATAndTMobilityLLCMember
     
Amount included in non-controlling interests 4,500,000us-gaap_MinorityInterest
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= atni_USRetailWirelessBusinessMember
/ dei_LegalEntityAxis
= atni_ATAndTMobilityLLCMember
10,000,000us-gaap_MinorityInterest
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= atni_USRetailWirelessBusinessMember
/ dei_LegalEntityAxis
= atni_ATAndTMobilityLLCMember
      4,500,000us-gaap_MinorityInterest
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= atni_USRetailWirelessBusinessMember
/ dei_LegalEntityAxis
= atni_ATAndTMobilityLLCMember
10,000,000us-gaap_MinorityInterest
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= atni_USRetailWirelessBusinessMember
/ dei_LegalEntityAxis
= atni_ATAndTMobilityLLCMember
     
Revenues and income from discontinued operations                    
Revenue from discontinued operations             299,519,000us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= atni_USRetailWirelessBusinessMember
/ dei_LegalEntityAxis
= atni_ATAndTMobilityLLCMember
464,382,000us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= atni_USRetailWirelessBusinessMember
/ dei_LegalEntityAxis
= atni_ATAndTMobilityLLCMember
   
Income from discontinued operations, net of tax expense (benefit) of $1,967, $13,816 and $2,512 respectively             5,166,000us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= atni_USRetailWirelessBusinessMember
/ dei_LegalEntityAxis
= atni_ATAndTMobilityLLCMember
29,202,000us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= atni_USRetailWirelessBusinessMember
/ dei_LegalEntityAxis
= atni_ATAndTMobilityLLCMember
   
Income from discontinued operations, tax expense (benefit)             $ 2,512,000us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriod
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= atni_USRetailWirelessBusinessMember
/ dei_LegalEntityAxis
= atni_ATAndTMobilityLLCMember
$ 13,816,000us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriod
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= atni_USRetailWirelessBusinessMember
/ dei_LegalEntityAxis
= atni_ATAndTMobilityLLCMember