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COMMITMENTS AND CONTINGENCIES (Details) In Millions, unless otherwise specified | 1 Months Ended | 12 Months Ended |  | 0 Months Ended |  |  | 0 Months Ended |  | 0 Months Ended |  |  |  | 1 Months Ended | 12 Months Ended |  |  | 12 Months Ended
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Jan. 31, 2014 USD ($) | Jan. 31, 2014 AWG | Dec. 31, 2011 Contingency related to spectrum fees USD ($) | Dec. 31, 2014 Letter of credit sub-facility USD ($) | Jun. 17, 2013 Letter of credit sub-facility Amended Credit Facility | Dec. 31, 2014 Letter of credit sub-facility Amended Credit Facility USD ($) | Dec. 19, 2014 Letter of credit sub-facility Amended Credit Facility USD ($) | Nov. 14, 2013 Alltel Mobility Funds Letter of credit sub-facility USD ($) | Jun. 17, 2013 Alltel Mobility Funds Letter of credit sub-facility Amended Credit Facility USD ($) | Dec. 19, 2014 Alltel Mobility Funds Letter of credit sub-facility Amended Credit Facility USD ($) | Nov. 14, 2013 Universal Service Administrative Company Letter of credit sub-facility USD ($) | Jun. 30, 2013 Universal Service Administrative Company Letter of credit sub-facility USD ($) | Dec. 31, 2013 Universal Service Administrative Company Letter of credit sub-facility Amended Credit Facility USD ($) | Jun. 17, 2013 Universal Service Administrative Company Letter of credit sub-facility Amended Credit Facility USD ($) | Nov. 30, 2007 Lawsuit filed by CTL Minimum USD ($) | Dec. 31, 2014 Litigation proceedings and disputes in Guyana | Feb. 17, 2010 Lawsuit filed by GT&T against Digicel USD ($) | Feb. 17, 2010 Lawsuit filed by GT&T against Digicel Minimum USD ($) | Dec. 31, 2014 Legal claims regarding tax filings with the Guyana Revenue Authority USD ($) | Dec. 31, 2014 Legal claims regarding tax filings with the Guyana Revenue Authority Minimum
Commitments and contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | $ 55.0 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = atni_AmendmentToCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LetterOfCreditMember | $ 10.0 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = atni_AmendmentToCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LetterOfCreditMember |  |  | $ 25.0 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = atni_AmendmentToCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LetterOfCreditMember / atni_TypeOfMobilityFundAxis = atni_AlltelMobilityFundsMember |  |  |  |  |  |  |  |  |  |
Amount of pending awards of mobility fund grants |  |  |  |  |  |  |  |  | 68.8 atni_AmountOfPendingAwardsToBeSecuredAgainstIssuanceOfDebtInstrument / us-gaap_CreditFacilityAxis = atni_AmendmentToCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LetterOfCreditMember / atni_TypeOfMobilityFundAxis = atni_AlltelMobilityFundsMember |  |  |  |  |  |  |  |  |  |  |
Termination of facility |  |  |  |  |  |  |  | 19.9 us-gaap_ExtinguishmentOfDebtAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_LetterOfCreditMember / atni_TypeOfMobilityFundAxis = atni_AlltelMobilityFundsMember |  |  | 19.9 us-gaap_ExtinguishmentOfDebtAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_LetterOfCreditMember / atni_TypeOfMobilityFundAxis = atni_UniversalServiceAdministrativeCompanyMember |  |  |  |  |  |  |  |  |
Letters of credit posted to USAC |  |  |  | 10.6 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_LetterOfCreditMember |  |  |  |  |  |  |  | 29.8 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_LetterOfCreditMember / atni_TypeOfMobilityFundAxis = atni_UniversalServiceAdministrativeCompanyMember | 9.9 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_CreditFacilityAxis = atni_AmendmentToCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LetterOfCreditMember / atni_TypeOfMobilityFundAxis = atni_UniversalServiceAdministrativeCompanyMember | 29.8 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_CreditFacilityAxis = atni_AmendmentToCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LetterOfCreditMember / atni_TypeOfMobilityFundAxis = atni_UniversalServiceAdministrativeCompanyMember |  |  |  |  |  |
Commitment fee (as a percent) |  |  |  |  | 1.75%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage / us-gaap_CreditFacilityAxis = atni_AmendmentToCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LetterOfCreditMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Draw downs against issued letters of credit |  |  |  |  |  |  |  |  |  |  |  |  | 0 atni_DrawDownsAgainstIssuedLettersOfCredit / us-gaap_CreditFacilityAxis = atni_AmendmentToCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LetterOfCreditMember / atni_TypeOfMobilityFundAxis = atni_UniversalServiceAdministrativeCompanyMember |  |  |  |  |  |  |
Period for which litigation proceedings and other disputes have not been the subject of discussions or other significant activity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |
Spectrum fees paid |  |  | 2.6 atni_LossContingencySpectrumFeesPaid / us-gaap_LossContingenciesByNatureOfContingencyAxis = atni_ContingencyRelatedToSpectrumFeesMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damages asserted |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200 us-gaap_LossContingencyDamagesSoughtValue / us-gaap_LitigationCaseAxis = atni_LawsuitFiledByCaribbeanTelecommunicationsLimitedMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |
Actual damages |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9 atni_LossContingencyActualDamages / us-gaap_LitigationCaseAxis = atni_LawsuitFiledByGuyanaTelephoneAndTelegraphLimitedAgainstDigicelMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Punitive damages |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 atni_LossContingencyPunitiveDamages / us-gaap_LitigationCaseAxis = atni_LawsuitFiledByGuyanaTelephoneAndTelegraphLimitedAgainstDigicelMember |  |  |
Future payments related to disputed tax assessments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 33.2 us-gaap_LossContingencyEstimateOfPossibleLoss / us-gaap_LitigationCaseAxis = atni_LegalClaimsRegardingTaxFilingsMember |
Percentage of return on investment ensured by the government of Guyana |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15.00%atni_LossContingencyMinimumReturnOnInvestmentEnsuredByGovernmentOfGuyana / us-gaap_LitigationCaseAxis = atni_LegalClaimsRegardingTaxFilingsMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Renewal fee of telecommunications license | $ 4.0 atni_LossContingencyRenewalFeeOfTelecommunicationsLicense | 7.2 atni_LossContingencyRenewalFeeOfTelecommunicationsLicense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

X
- Definition Represents the amount of pending awards of mobility fund grants to be secured against the issuance of debt instrument. + References No definition available. + Details
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Period Type: | duration

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- Definition Represents the total amounts drawn down on issued letters of credit as of the reporting date. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Represents the amount of actual damages that the plaintiff seeks in the legal matter. + References No definition available. + Details
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Namespace Prefix: | atni_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Represents the return on investment ensured by the government of Guyana, in which if the entity's return on investment falls below the ensured percentage, the Government of Guyana is obligated to reimburse any necessary amount. + References No definition available. + Details
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- Definition Represents the period for which litigation proceedings and other disputes, while not conclusively resolved, have not been the subject of discussions or other significant activity. + References No definition available. + Details
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- Definition Represents the amount of punitive damages that the plaintiff seeks in the legal matter. + References No definition available. + Details
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Namespace Prefix: | atni_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Represents the amount of renewal fee of telecommunications license. + References No definition available. + Details
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Namespace Prefix: | atni_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the amount of spectrum fees paid as full settlement. + References No definition available. + Details
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Namespace Prefix: | atni_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Gross amount of debt extinguished. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The value (monetary amount) of the award the plaintiff seeks in the legal matter. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Reflects the estimated amount of loss from the specified contingency as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 + Details
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Period Type: | instant