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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
Understatement of Transactional Tax Liabilities | General and administrative expense
Prior period corrections
Correction of immaterial prior period errors in current period	$ 0.7us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsAmount / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember / us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsByNatureOfErrorAxis = atni_UnderstatementOfTransactionalTaxLiabilitiesMember
Understatement of Foreign Exchange Gains | Other Income
Prior period corrections
Correction of immaterial prior period errors in current period	$ 1.1us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsAmount / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherIncomeMember / us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsByNatureOfErrorAxis = atni_UnderstatementOfForeignExchangeGainsMember

X

- Definition

Amount of each individual error being corrected in the correcting adjustment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 250

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SAB TOPIC 1.N.Q3)

-URI http://asc.fasb.org/extlink&oid=26874127&loc=d3e30840-122693



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 1

-Section N

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