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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 8) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Accounting for grants |  |  |
Amount spent in capital expenditures | $ 58,300,000 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | $ 69,316,000 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | $ 42,154,000 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Minimum |  |  |
Accounting for grants |  |  |
Long-term power purchase agreements term | 10 years |  |
Term of depreciation of grant | 5 years |  |
Maximum |  |  |
Accounting for grants |  |  |
Long-term power purchase agreements term | 25 years |  |
Term of depreciation of grant | 20 years |  |
Stimulus programs |  |  |
Accounting for grants |  |  |
Amount spent in capital expenditures | 92,500,000 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / atni_GrantsByProgramTypeAxis = atni_StimulusProgramMember |  |
Amount that has been funded or will be funded | 67,000,000 us-gaap_GrantsReceivable / atni_GrantsByProgramTypeAxis = atni_StimulusProgramMember |  |
Universal Service Fund programs |  |  |
Accounting for grants |  |  |
Amount received | 3,900,000 atni_ProceedsFromGrants / atni_GrantsByProgramTypeAxis = atni_UniversalServiceFundProgramMember | 2,400,000 atni_ProceedsFromGrants / atni_GrantsByProgramTypeAxis = atni_UniversalServiceFundProgramMember |
Amount available to support U.S wireless business relating to high-cost areas | $ 1,300,000 atni_AmountAvailableToSupportHighCostAreasFromProceedsFromGrants / atni_GrantsByProgramTypeAxis = atni_UniversalServiceFundProgramMember | $ 1,600,000 atni_AmountAvailableToSupportHighCostAreasFromProceedsFromGrants / atni_GrantsByProgramTypeAxis = atni_UniversalServiceFundProgramMember |

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- Definition Amount available to support U.S. wireless business relating to high cost areas from proceeds from grants received from U.S. Government and its agencies designed to fund telecommunications infrastructure expansion into rural or underserved areas of the United States. + References No definition available. + Details
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- Definition The period during which grants are depreciable. + References No definition available. + Details
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- Definition Proceeds from grants received from U.S. Government and its agencies designed to fund telecommunications infrastructure expansion into rural or underserved areas of the United States. + References No definition available. + Details
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- Definition Carrying amount as of the balance sheet date of amounts due under the terms of governmental, corporate, or foundation grants. + 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 210.5-02.8) -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 8 -Article 5 + Details
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- Definition Period covered by the long-term purchase commitment, 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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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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