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INCOME TAXES (Details 3) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Current:                      
United States-Federal                 $ 14,761,000us-gaap_CurrentFederalTaxExpenseBenefit $ 1,703,000us-gaap_CurrentFederalTaxExpenseBenefit $ 4,812,000us-gaap_CurrentFederalTaxExpenseBenefit
United States-State                 1,347,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit 895,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit 2,418,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Foreign                 12,153,000us-gaap_CurrentForeignTaxExpenseBenefit 11,787,000us-gaap_CurrentForeignTaxExpenseBenefit 11,099,000us-gaap_CurrentForeignTaxExpenseBenefit
Total current income tax expense                 28,261,000us-gaap_CurrentIncomeTaxExpenseBenefit 14,385,000us-gaap_CurrentIncomeTaxExpenseBenefit 18,329,000us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:                      
United States-Federal                 5,205,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit (5,273,000)us-gaap_DeferredFederalIncomeTaxExpenseBenefit 4,050,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit
United States-State                 466,000us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 169,000us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit (1,011,000)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Foreign                 (5,784,000)us-gaap_DeferredForeignIncomeTaxExpenseBenefit 255,000us-gaap_DeferredForeignIncomeTaxExpenseBenefit (537,000)us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Total deferred income tax expense (benefit)                 (113,000)us-gaap_DeferredIncomeTaxExpenseBenefit (4,849,000)us-gaap_DeferredIncomeTaxExpenseBenefit 2,502,000us-gaap_DeferredIncomeTaxExpenseBenefit
Consolidated:                      
United States-Federal                 19,966,000us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations (3,570,000)us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations 8,862,000us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations
United States-State                 1,813,000us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations 1,064,000us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations 1,407,000us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations
Foreign                 6,369,000us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations 12,042,000us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations 10,562,000us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations
Income tax expense 5,689,000us-gaap_IncomeTaxExpenseBenefit 9,569,000us-gaap_IncomeTaxExpenseBenefit 7,338,000us-gaap_IncomeTaxExpenseBenefit 5,552,000us-gaap_IncomeTaxExpenseBenefit (1,758,000)us-gaap_IncomeTaxExpenseBenefit 2,481,000us-gaap_IncomeTaxExpenseBenefit 4,868,000us-gaap_IncomeTaxExpenseBenefit 3,945,000us-gaap_IncomeTaxExpenseBenefit 28,148,000us-gaap_IncomeTaxExpenseBenefit 9,536,000us-gaap_IncomeTaxExpenseBenefit 20,831,000us-gaap_IncomeTaxExpenseBenefit
Deferred tax assets:                      
Receivables reserve 1,321,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves       1,225,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves       1,321,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves 1,225,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves  
Temporary differences not currently deductible for tax 8,001,000us-gaap_DeferredTaxAssetsOther       6,690,000us-gaap_DeferredTaxAssetsOther       8,001,000us-gaap_DeferredTaxAssetsOther 6,690,000us-gaap_DeferredTaxAssetsOther  
Deferred compensation 2,019,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation       1,702,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation       2,019,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation 1,702,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation  
Foreign tax credit carryforwards 10,576,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign       13,575,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign       10,576,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign 13,575,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign  
Pension 436,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions               436,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions    
Net operating losses 4,171,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards       2,822,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards       4,171,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 2,822,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards  
Valuation allowance (13,763,000)us-gaap_DeferredTaxAssetsValuationAllowance       (16,312,000)us-gaap_DeferredTaxAssetsValuationAllowance       (13,763,000)us-gaap_DeferredTaxAssetsValuationAllowance (16,312,000)us-gaap_DeferredTaxAssetsValuationAllowance  
Total deferred tax asset 12,761,000us-gaap_DeferredTaxAssetsNet       9,702,000us-gaap_DeferredTaxAssetsNet       12,761,000us-gaap_DeferredTaxAssetsNet 9,702,000us-gaap_DeferredTaxAssetsNet  
Deferred tax liabilities:                      
Property, plant and equipment, net 27,681,000us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment       23,866,000us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment       27,681,000us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment 23,866,000us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment  
Intangible assets, net 12,021,000us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets       11,245,000us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets       12,021,000us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets 11,245,000us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets  
Tax on foreign earnings 1,050,000us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings               1,050,000us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings    
Pension         205,000atni_DeferredTaxLiabilitiesPensionCosts         205,000atni_DeferredTaxLiabilitiesPensionCosts  
Total deferred tax liabilities 40,752,000us-gaap_DeferredIncomeTaxLiabilities       35,316,000us-gaap_DeferredIncomeTaxLiabilities       40,752,000us-gaap_DeferredIncomeTaxLiabilities 35,316,000us-gaap_DeferredIncomeTaxLiabilities  
Net deferred tax liabilities 27,991,000us-gaap_DeferredTaxLiabilities       25,614,000us-gaap_DeferredTaxLiabilities       27,991,000us-gaap_DeferredTaxLiabilities 25,614,000us-gaap_DeferredTaxLiabilities  
Deferred tax assets:                      
Current 2,588,000us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent       1,994,000us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent       2,588,000us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent 1,994,000us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent  
Total deferred tax asset 2,588,000atni_AggregateDeferredTaxAssetsNetOfValuationAllowanceAndNetOfLiabilities       1,994,000atni_AggregateDeferredTaxAssetsNetOfValuationAllowanceAndNetOfLiabilities       2,588,000atni_AggregateDeferredTaxAssetsNetOfValuationAllowanceAndNetOfLiabilities 1,994,000atni_AggregateDeferredTaxAssetsNetOfValuationAllowanceAndNetOfLiabilities  
Deferred tax liabilities:                      
Current 213,000us-gaap_DeferredTaxLiabilitiesCurrent       1,601,000us-gaap_DeferredTaxLiabilitiesCurrent       213,000us-gaap_DeferredTaxLiabilitiesCurrent 1,601,000us-gaap_DeferredTaxLiabilitiesCurrent  
Long term 30,366,000us-gaap_DeferredTaxLiabilitiesNoncurrent       26,007,000us-gaap_DeferredTaxLiabilitiesNoncurrent       30,366,000us-gaap_DeferredTaxLiabilitiesNoncurrent 26,007,000us-gaap_DeferredTaxLiabilitiesNoncurrent  
Total deferred tax liabilities 30,579,000atni_AggregateDeferredTaxLiabilitiesNetOfAssetsAndNetOfValuationAllowance       27,608,000atni_AggregateDeferredTaxLiabilitiesNetOfAssetsAndNetOfValuationAllowance       30,579,000atni_AggregateDeferredTaxLiabilitiesNetOfAssetsAndNetOfValuationAllowance 27,608,000atni_AggregateDeferredTaxLiabilitiesNetOfAssetsAndNetOfValuationAllowance  
Net deferred tax liabilities 27,991,000us-gaap_DeferredTaxLiabilities       25,614,000us-gaap_DeferredTaxLiabilities       27,991,000us-gaap_DeferredTaxLiabilities 25,614,000us-gaap_DeferredTaxLiabilities  
Operating loss carryforwards                      
Period of cumulative loss                 3 years    
Undistributed earnings of foreign subsidiaries considered indefinitely reinvested 131,600,000us-gaap_UndistributedEarningsOfForeignSubsidiaries               131,600,000us-gaap_UndistributedEarningsOfForeignSubsidiaries    
State                      
Operating loss carryforwards                      
Net operating loss carryforwards 32,100,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		               32,100,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		    
NOL carryforward valuation allowance 1,700,000us-gaap_OperatingLossCarryforwardsValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		       1,100,000us-gaap_OperatingLossCarryforwardsValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		       1,700,000us-gaap_OperatingLossCarryforwardsValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		 1,100,000us-gaap_OperatingLossCarryforwardsValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		  
Foreign                      
Operating loss carryforwards                      
Net operating loss carryforwards 8,700,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember		               8,700,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember		    
NOL carryforward valuation allowance 1,400,000us-gaap_OperatingLossCarryforwardsValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember		       1,600,000us-gaap_OperatingLossCarryforwardsValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember		       1,400,000us-gaap_OperatingLossCarryforwardsValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember		 1,600,000us-gaap_OperatingLossCarryforwardsValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember		  
Tax credit carryforwards that expired during the period 3,000,000atni_TaxCreditCarryforwardsExpired
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember		       1,800,000atni_TaxCreditCarryforwardsExpired
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember		       3,000,000atni_TaxCreditCarryforwardsExpired
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember		 1,800,000atni_TaxCreditCarryforwardsExpired
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember		  
Foreign | Aruba                      
Operating loss carryforwards                      
Net operating loss carryforwards $ 6,100,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember
/ us-gaap_StatementGeographicalAxis
= country_AW		               $ 6,100,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember
/ us-gaap_StatementGeographicalAxis
= country_AW