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RELATED PARTY TRANSACTIONS (Details) (USD $) | 12 Months Ended | 1 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Oct. 31, 2014 item
Related Party Transaction |  |  |  |
Rent payments | $ 15,000,000 us-gaap_OperatingLeasesRentExpenseNet | $ 12,700,000 us-gaap_OperatingLeasesRentExpenseNet | $ 13,700,000 us-gaap_OperatingLeasesRentExpenseNet |
Cornelius B. Prior Jr | Tropical Tower |  |  |  |
Related Party Transaction |  |  |  |
Ownership percentage |  |  |  | 90 atni_RelatedPartyOwnershipPercentage / dei_LegalEntityAxis = atni_TropicalTowerLtdMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_BoardOfDirectorsChairmanMember
Rent payments |  |  |  | $ 117,000 us-gaap_OperatingLeasesRentExpenseNet / dei_LegalEntityAxis = atni_TropicalTowerLtdMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_BoardOfDirectorsChairmanMember
Initial Term |  |  |  | 5 years
Number of additional renewal period |  |  |  | 2 atni_NumberOfAdditionalRenewalPeriod / dei_LegalEntityAxis = atni_TropicalTowerLtdMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_BoardOfDirectorsChairmanMember
Renewal period |  |  |  | 5 years
Percentage of increase in rent |  |  |  | 5.00%atni_OperatingLeaseRentPercentageIncrease / dei_LegalEntityAxis = atni_TropicalTowerLtdMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_BoardOfDirectorsChairmanMember

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- Definition Represents information pertaining to number of additional renewal period. + References No definition available. + Details
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- Definition Represents information pertaining to increase in percentage of rent every year. + References No definition available. + Details
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- Definition The percentage of ownership interest in related party transactions. + References No definition available. + Details
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- Definition Term of the lessee's leasing arrangement renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
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- Definition Term of the lessee's leasing arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_LesseeLeasingArrangementsOperatingLeasesTermOfContract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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Namespace Prefix: | us-gaap_
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- Details
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- Details
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