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ACQUISITIONS (Details) (USD $) | 3 Months Ended | 12 Months Ended | 24 Months Ended | 0 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 | Dec. 31, 2014 | Dec. 24, 2014 | Dec. 31, 2014
Purchase price allocation: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 88,511,000 us-gaap_Revenues | $ 89,393,000 us-gaap_Revenues | $ 83,269,000 us-gaap_Revenues | $ 75,174,000 us-gaap_Revenues | $ 77,028,000 us-gaap_Revenues | $ 79,350,000 us-gaap_Revenues | $ 71,625,000 us-gaap_Revenues | $ 64,832,000 us-gaap_Revenues | $ 336,347,000 us-gaap_Revenues | $ 292,835,000 us-gaap_Revenues | $ 277,796,000 us-gaap_Revenues |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Useful life |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |
Minimum | Solar assets |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Useful life |  |  |  |  |  |  |  |  |  |  |  | 20 years |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Useful life |  |  |  |  |  |  |  |  | 39 years |  |  |  |  |
Maximum | Solar assets |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Useful life |  |  |  |  |  |  |  |  |  |  |  | 23 years |  |
Ahana Renewables |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total transaction value |  |  |  |  |  |  |  |  |  |  |  |  | 117,100,000 atni_BusinessCombinationConsiderationTransactionValue / us-gaap_BusinessAcquisitionAxis = atni_AhanaRenewablesLlcMember |
Total consideration |  |  |  |  |  |  |  |  |  |  |  |  | 78,782,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = atni_AhanaRenewablesLlcMember |
Cash consideration paid |  |  |  |  |  |  |  |  |  |  |  |  | 78,800,000 atni_BusinessCombinationConsiderationTransferredCash / us-gaap_BusinessAcquisitionAxis = atni_AhanaRenewablesLlcMember |
Assumed debt |  |  |  |  |  |  |  |  |  |  |  |  | 38,900,000 us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred / us-gaap_BusinessAcquisitionAxis = atni_AhanaRenewablesLlcMember |
Profit or loss allocation percentage |  |  |  |  |  |  |  |  |  |  |  |  | 1.00%atni_BusinessCombinationProfitLossAllocationPercentage / us-gaap_BusinessAcquisitionAxis = atni_AhanaRenewablesLlcMember |
Period of placed in service date for solar assets |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |
Profit or loss allocation percentage after flip date |  |  |  |  |  |  |  |  |  |  |  |  | 95.00%atni_BusinessCombinationProfitLossAllocationPercentageAfterFlipDate / us-gaap_BusinessAcquisitionAxis = atni_AhanaRenewablesLlcMember |
Purchase price allocation: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  |  |  |  |  |  |  |  |  |  |  |  | 6,571,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = atni_AhanaRenewablesLlcMember |
Other current assets |  |  |  |  |  |  |  |  |  |  |  |  | 2,011,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther / us-gaap_BusinessAcquisitionAxis = atni_AhanaRenewablesLlcMember |
Plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  | 111,446,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = atni_AhanaRenewablesLlcMember |
Current liabilities |  |  |  |  |  |  |  |  |  |  |  |  | (853,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = atni_AhanaRenewablesLlcMember |
Long-term debt |  |  |  |  |  |  |  |  |  |  |  |  | (38,877,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt / us-gaap_BusinessAcquisitionAxis = atni_AhanaRenewablesLlcMember |
Non-controlling interests |  |  |  |  |  |  |  |  |  |  |  |  | (7,400,000)us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue / us-gaap_BusinessAcquisitionAxis = atni_AhanaRenewablesLlcMember |
Net assets acquired |  |  |  |  |  |  |  |  |  |  |  |  | 78,782,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedLessNoncontrollingInterest / us-gaap_BusinessAcquisitionAxis = atni_AhanaRenewablesLlcMember |
Weighted average tax rate percentage |  |  |  |  |  |  |  |  |  |  |  |  | 40.00%atni_WeightedAverageTaxRateUsedToComputeDiscountedCashFlowsForNoncontrollingInterest / us-gaap_BusinessAcquisitionAxis = atni_AhanaRenewablesLlcMember |
Discounted rate used for cash flows |  |  |  |  |  |  |  |  |  |  |  |  | 11.75%atni_FairValueOfDiscountedRateUsedToComputeCashFlowsForNoncontrollingInterest / us-gaap_BusinessAcquisitionAxis = atni_AhanaRenewablesLlcMember |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  | 400,000 us-gaap_Revenues / us-gaap_BusinessAcquisitionAxis = atni_AhanaRenewablesLlcMember
External acquisition related charges relating to legal, accounting and consulting services. |  |  |  |  |  |  |  |  |  |  |  |  | 2,500,000 us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts / us-gaap_BusinessAcquisitionAxis = atni_AhanaRenewablesLlcMember |
Ahana Renewables | Solar assets |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Useful life |  |  |  |  |  |  |  |  |  |  |  |  | 25 years |
Discounted rate used for solar assets |  |  |  |  |  |  |  |  |  |  |  |  | 8.00%atni_FairValueOfDiscountedRateUsedToComputeCashFlowForSolarAssets / us-gaap_BusinessAcquisitionAxis = atni_AhanaRenewablesLlcMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = atni_SolarAssetsMember |
Ahana Renewables | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of noncontrolling interest initial contribution to be used as basis for buyout option |  |  |  |  |  |  |  |  |  |  |  |  | 10.00%atni_BusinessCombinationNonControllingInterestBuyoutOptionPercentageOfInitialContribution / us-gaap_BusinessAcquisitionAxis = atni_AhanaRenewablesLlcMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
Ahana Renewables | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of noncontrolling interest initial contribution to be used as basis for buyout option |  |  |  |  |  |  |  |  |  |  |  |  | 15.00%atni_BusinessCombinationNonControllingInterestBuyoutOptionPercentageOfInitialContribution / us-gaap_BusinessAcquisitionAxis = atni_AhanaRenewablesLlcMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
Ahana Renewables | Restricted cash |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,884,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = atni_AhanaRenewablesLlcMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = atni_RestrictedCashMember |
Ahana Renewables | Tax Equity Investor |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |
Profit or loss allocation percentage |  |  |  |  |  |  |  |  |  |  |  |  | 99.00%atni_BusinessCombinationProfitLossAllocationPercentage / us-gaap_BusinessAcquisitionAxis = atni_AhanaRenewablesLlcMember / us-gaap_CounterpartyNameAxis = atni_TaxEquityInvestorMember |
Profit or loss allocation percentage after flip date |  |  |  |  |  |  |  |  |  |  |  |  | 5.00%atni_BusinessCombinationProfitLossAllocationPercentageAfterFlipDate / us-gaap_BusinessAcquisitionAxis = atni_AhanaRenewablesLlcMember / us-gaap_CounterpartyNameAxis = atni_TaxEquityInvestorMember |
Ahana Renewables | Tax Equity Investor | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period to receive return on investment |  |  |  |  |  |  |  |  |  |  |  |  | 2 years |
Ahana Renewables | Tax Equity Investor | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period to receive return on investment |  |  |  |  |  |  |  |  |  |  |  |  | 4 years |

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