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RELATED PARTY TRANSACTIONS (Details) (USD $)	12 Months Ended			1 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Oct. 31, 2014 item
Related Party Transaction
Rent payments	$ 15,000,000us-gaap_OperatingLeasesRentExpenseNet	$ 12,700,000us-gaap_OperatingLeasesRentExpenseNet	$ 13,700,000us-gaap_OperatingLeasesRentExpenseNet
Cornelius B. Prior Jr | Tropical Tower
Related Party Transaction
Ownership percentage				90atni_RelatedPartyOwnershipPercentage / dei_LegalEntityAxis = atni_TropicalTowerLtdMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_BoardOfDirectorsChairmanMember
Rent payments				$ 117,000us-gaap_OperatingLeasesRentExpenseNet / dei_LegalEntityAxis = atni_TropicalTowerLtdMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_BoardOfDirectorsChairmanMember
Initial Term				5 years
Number of additional renewal period				2atni_NumberOfAdditionalRenewalPeriod / dei_LegalEntityAxis = atni_TropicalTowerLtdMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_BoardOfDirectorsChairmanMember
Renewal period				5 years
Percentage of increase in rent				5.00%atni_OperatingLeaseRentPercentageIncrease / dei_LegalEntityAxis = atni_TropicalTowerLtdMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_BoardOfDirectorsChairmanMember

X

- Definition

Represents information pertaining to number of additional renewal period.

+ References

No definition available.

+ Details

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- Definition

Represents information pertaining to increase in percentage of rent every year.

+ References

No definition available.

+ Details

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- Definition

The percentage of ownership interest in related party transactions.

+ References

No definition available.

+ Details

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X

- Definition

Term of the lessee's leasing arrangement renewal, 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

Term of the lessee's leasing arrangement, 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

Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717

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