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GOVERNMENT GRANTS (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 1 Months Ended |
--- | --- | --- | ---
Mar. 31, 2015 item | Aug. 31, 2013 | Dec. 31, 2014
MOBILITY FUND GRANTS |  |  |
Number of new funds created by FCC | 2 atni_NumberOfNewFundsCreatedByCommunicationsCommission |  |
Period over which a portion of the Mobility Funds is used to offset the costs of supporting the networks | 5 years |  |
Letter of credit sub-facility |  |  |
MOBILITY FUND GRANTS |  |  |
Letters of credit posted to USAC | 10.6 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_LetterOfCreditMember |  | $ 10.6 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_LetterOfCreditMember
Wholesale Mobility Funds |  |  |
MOBILITY FUND GRANTS |  |  |
Mobility Funds approved by FCC |  | 21.7 atni_MobilityFundsApprovedByFederalCommunicationsCommission / atni_TypeOfMobilityFundAxis = atni_WholesaleMobilityFundsMember |
Wholesale Mobility Funds | U.S. Wireless |  |  |
MOBILITY FUND GRANTS |  |  |
Mobility Funds received | 8.0 atni_MobilityFundsReceived / us-gaap_StatementBusinessSegmentsAxis = atni_USWirelessMember / atni_TypeOfMobilityFundAxis = atni_WholesaleMobilityFundsMember |  |
Grant funds used to offset fixed asset related costs | 1.4 atni_GrantFundsUsedToOffsetFixedAssetRelatedCosts / us-gaap_StatementBusinessSegmentsAxis = atni_USWirelessMember / atni_TypeOfMobilityFundAxis = atni_WholesaleMobilityFundsMember |  |
Wholesale Mobility Funds | U.S. Wireless | Other current liabilities |  |  |
MOBILITY FUND GRANTS |  |  |
Mobility Funds received | 2.1 atni_MobilityFundsReceived / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentLiabilitiesMember / us-gaap_StatementBusinessSegmentsAxis = atni_USWirelessMember / atni_TypeOfMobilityFundAxis = atni_WholesaleMobilityFundsMember |  |
Wholesale Mobility Funds | U.S. Wireless | Other long-term liabilities |  |  |
MOBILITY FUND GRANTS |  |  |
Mobility Funds received | 3.8 atni_MobilityFundsReceived / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_StatementBusinessSegmentsAxis = atni_USWirelessMember / atni_TypeOfMobilityFundAxis = atni_WholesaleMobilityFundsMember |  |
Universal Service Administrative Company | Letter of credit sub-facility |  |  |
MOBILITY FUND GRANTS |  |  |
Letters of credit posted to USAC | 10.6 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_LetterOfCreditMember / atni_TypeOfMobilityFundAxis = atni_UniversalServiceAdministrativeCompanyMember |  |

X
- Definition Represents the amount of grants received for the construction of assets which are recognized as a reduction of the cost of fixed assets, a reduction of depreciation expense over the useful lives of the assets, and as a reduction of capital expenditures. + References No definition available. + Details
Name: | atni_GrantFundsUsedToOffsetFixedAssetRelatedCosts
Namespace Prefix: | atni_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | atni_MobilityFundLineItems
Namespace Prefix: | atni_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the amount of Mobility Fund support approved by Federal Communications Commission (FCC). + References No definition available. + Details
Name: | atni_MobilityFundsApprovedByFederalCommunicationsCommission
Namespace Prefix: | atni_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Mobility Funds received to offset construction costs and future operations expenses. + References No definition available. + Details
Name: | atni_MobilityFundsReceived
Namespace Prefix: | atni_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the number of new funds created by Federal Communications Commission (FCC). + References No definition available. + Details
Name: | atni_NumberOfNewFundsCreatedByCommunicationsCommission
Namespace Prefix: | atni_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the period over which a portion of the Mobility Funds is used to offset the costs of supporting the networks. + References No definition available. + Details
Name: | atni_PeriodOverWhichMobilityFundUsedToOffsetCostsOfSupportingTheNetworks
Namespace Prefix: | atni_
Data Type: | xbrli:durationItemType
Balance Type: | na
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
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |