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GOODWILL AND INTANGIBLE ASSETS (Details 2) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 item
Telecommunications licenses |  |  |
Impairment of intangible assets | $ 0 us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill | $ 0 us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill |
Changes in the carrying amount of the company's telecommunications licenses, by operating segment |  |  |
Balance at the beginning of the period | 39,687 us-gaap_IndefiniteLivedLicenseAgreements |  |
Balance at the end of the period | 44,090 us-gaap_IndefiniteLivedLicenseAgreements | 39,687 us-gaap_IndefiniteLivedLicenseAgreements |
Certain Island Wireless Reporting Unit |  |  |
Telecommunications licenses |  |  |
Number of reporting units where book value exceeded fair value |  |  | 1 atni_NumberOfReportingUnitsWhereBookValueExceededFairValue / us-gaap_StatementBusinessSegmentsAxis = atni_CertainIslandWirelessReportingUnitMember
Telecommunications Licenses |  |  |
Telecommunications licenses |  |  |
Impairment of intangible assets | 0 us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember | 0 us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember |
Changes in the carrying amount of the company's telecommunications licenses, by operating segment |  |  |
Balance at the beginning of the period | 39,687 us-gaap_IndefiniteLivedLicenseAgreements / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember | 39,905 us-gaap_IndefiniteLivedLicenseAgreements / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember |
Acquired licenses | 5,025 us-gaap_IndefinitelivedIntangibleAssetsAcquired / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember | 186 us-gaap_IndefinitelivedIntangibleAssetsAcquired / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember |
Licenses sold |  | (404)us-gaap_IndefiniteLivedIntangibleAssetsWrittenOffRelatedToSaleOfBusinessUnit / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember |
Amortization | (622)us-gaap_AmortizationOfIntangibleAssets / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember |  |
Balance at the end of the period | 44,090 us-gaap_IndefiniteLivedLicenseAgreements / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember | 39,687 us-gaap_IndefiniteLivedLicenseAgreements / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember |
Telecommunications Licenses | U.S. Wireless |  |  |
Changes in the carrying amount of the company's telecommunications licenses, by operating segment |  |  |
Balance at the beginning of the period | 19,888 us-gaap_IndefiniteLivedLicenseAgreements / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember / us-gaap_StatementBusinessSegmentsAxis = atni_USWirelessMember | 20,106 us-gaap_IndefiniteLivedLicenseAgreements / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember / us-gaap_StatementBusinessSegmentsAxis = atni_USWirelessMember |
Acquired licenses | 5,025 us-gaap_IndefinitelivedIntangibleAssetsAcquired / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember / us-gaap_StatementBusinessSegmentsAxis = atni_USWirelessMember | 186 us-gaap_IndefinitelivedIntangibleAssetsAcquired / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember / us-gaap_StatementBusinessSegmentsAxis = atni_USWirelessMember |
Licenses sold |  | (404)us-gaap_IndefiniteLivedIntangibleAssetsWrittenOffRelatedToSaleOfBusinessUnit / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember / us-gaap_StatementBusinessSegmentsAxis = atni_USWirelessMember |
Balance at the end of the period | 24,913 us-gaap_IndefiniteLivedLicenseAgreements / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember / us-gaap_StatementBusinessSegmentsAxis = atni_USWirelessMember | 19,888 us-gaap_IndefiniteLivedLicenseAgreements / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember / us-gaap_StatementBusinessSegmentsAxis = atni_USWirelessMember |
Telecommunications Licenses | U.S. Wireline |  |  |
Changes in the carrying amount of the company's telecommunications licenses, by operating segment |  |  |
Balance at the end of the period | 31 us-gaap_IndefiniteLivedLicenseAgreements / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember / us-gaap_StatementBusinessSegmentsAxis = atni_USWirelineMember | 31 us-gaap_IndefiniteLivedLicenseAgreements / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember / us-gaap_StatementBusinessSegmentsAxis = atni_USWirelineMember | 31 us-gaap_IndefiniteLivedLicenseAgreements / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember / us-gaap_StatementBusinessSegmentsAxis = atni_USWirelineMember
Telecommunications Licenses | Island Wireless |  |  |
Changes in the carrying amount of the company's telecommunications licenses, by operating segment |  |  |
Balance at the beginning of the period | 19,768 us-gaap_IndefiniteLivedLicenseAgreements / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember / us-gaap_StatementBusinessSegmentsAxis = atni_IslandWirelessMember |  |
Amortization | (622)us-gaap_AmortizationOfIntangibleAssets / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember / us-gaap_StatementBusinessSegmentsAxis = atni_IslandWirelessMember |  |
Balance at the end of the period | 19,146 us-gaap_IndefiniteLivedLicenseAgreements / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember / us-gaap_StatementBusinessSegmentsAxis = atni_IslandWirelessMember |  | 19,768 us-gaap_IndefiniteLivedLicenseAgreements / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember / us-gaap_StatementBusinessSegmentsAxis = atni_IslandWirelessMember
Telecommunications Licenses | Certain Island Wireless Reporting Unit |  |  |
Telecommunications licenses |  |  |
Impairment of intangible assets |  |  | 3,400 us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember / us-gaap_StatementBusinessSegmentsAxis = atni_CertainIslandWirelessReportingUnitMember

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- Definition Carrying amount (original costs adjusted for previously recognized amortization and impairment) as of the balance sheet date for the capitalized costs to acquire rights under a license arrangement (for example, to sell specified products in a specified territory) having an indefinite period of benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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