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INCOME TAXES (Details 4) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Activity related to unrecognized tax benefits |  |  |
Gross unrecognized tax benefits at the beginning of the period | $ 14,050,000 us-gaap_UnrecognizedTaxBenefits | $ 10,336,000 us-gaap_UnrecognizedTaxBenefits | $ 6,952,000 us-gaap_UnrecognizedTaxBenefits
Increase in uncertain tax positions | 1,675,000 atni_UnrecognizedTaxBenefitsIncreasesResultingFromTaxPositions | 4,137,000 atni_UnrecognizedTaxBenefitsIncreasesResultingFromTaxPositions | 3,384,000 atni_UnrecognizedTaxBenefitsIncreasesResultingFromTaxPositions
Lapse in statute of limitations | (226,000)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations |  |
Settlements |  | (423,000)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities |
Gross unrecognized tax benefits at the end of the period | 15,499,000 us-gaap_UnrecognizedTaxBenefits | 14,050,000 us-gaap_UnrecognizedTaxBenefits | 10,336,000 us-gaap_UnrecognizedTaxBenefits
Interest and penalties accrued | 1,000,000 us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued | 400,000 us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued | 500,000 us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued
Unrecognized tax benefits that would affect the effective tax rate if recognized | $ 16,500,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate |  |

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- Definition The gross amount of increases in unrecognized tax benefits resulting from tax positions taken in prior period tax returns and tax positions that have been or will be taken in the tax return for the current period, excluding amounts pertaining to examined tax returns. + References No definition available. + Details
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- Definition The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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- Definition Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Unrecognized Tax Benefit -URI http://asc.fasb.org/extlink&oid=6527854 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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- Definition The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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