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INCOME TAXES (Details 4) (USD $)	12 Months Ended
	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	$ 14,050,000us-gaap_UnrecognizedTaxBenefits	$ 10,336,000us-gaap_UnrecognizedTaxBenefits	$ 6,952,000us-gaap_UnrecognizedTaxBenefits
Increase in uncertain tax positions	1,675,000atni_UnrecognizedTaxBenefitsIncreasesResultingFromTaxPositions	4,137,000atni_UnrecognizedTaxBenefitsIncreasesResultingFromTaxPositions	3,384,000atni_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	15,499,000us-gaap_UnrecognizedTaxBenefits	14,050,000us-gaap_UnrecognizedTaxBenefits	10,336,000us-gaap_UnrecognizedTaxBenefits
Interest and penalties accrued	1,000,000us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued	400,000us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued	500,000us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued
Unrecognized tax benefits that would affect the effective tax rate if recognized	$ 16,500,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate

X

- 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.

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X

- 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

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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

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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

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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

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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)

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