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MOBILITY FUND GRANTS (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended	1 Months Ended	0 Months Ended
	Dec. 31, 2014 item	Aug. 31, 2013	Nov. 14, 2013	Sep. 20, 2013	Jun. 30, 2013
MOBILITY FUND GRANTS
Number of new funds created by FCC	2atni_NumberOfNewFundsCreatedByCommunicationsCommission
Period over which a portion of the Mobility Funds is used to offset the costs of supporting the networks	5 years
Letter of credit sub-facility
MOBILITY FUND GRANTS
Letters of credit posted to USAC	10.6us-gaap_LettersOfCreditOutstandingAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_LetterOfCreditMember
Alltel Mobility Funds
MOBILITY FUND GRANTS
Mobility Funds approved by FCC		47.0atni_MobilityFundsApprovedByFederalCommunicationsCommission / atni_TypeOfMobilityFundAxis = atni_AlltelMobilityFundsMember
Alltel Mobility Funds | Letter of credit sub-facility
MOBILITY FUND GRANTS
Amount terminated			19.9us-gaap_ExtinguishmentOfDebtAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_LetterOfCreditMember / atni_TypeOfMobilityFundAxis = atni_AlltelMobilityFundsMember
Wholesale Mobility Funds
MOBILITY FUND GRANTS
Mobility Funds approved by FCC		21.7atni_MobilityFundsApprovedByFederalCommunicationsCommission / atni_TypeOfMobilityFundAxis = atni_WholesaleMobilityFundsMember
Wholesale Mobility Funds | U.S. Wireless
MOBILITY FUND GRANTS
Mobility Funds received	7.3atni_MobilityFundsReceived / us-gaap_StatementBusinessSegmentsAxis = atni_USWirelessMember / atni_TypeOfMobilityFundAxis = atni_WholesaleMobilityFundsMember
Grant funds used to offset fixed asset related costs	1.2atni_GrantFundsUsedToOffsetFixedAssetRelatedCosts / us-gaap_StatementBusinessSegmentsAxis = atni_USWirelessMember / atni_TypeOfMobilityFundAxis = atni_WholesaleMobilityFundsMember
Wholesale Mobility Funds | U.S. Wireless | Other current liabilities
MOBILITY FUND GRANTS
Mobility Funds received	2.3atni_MobilityFundsReceived / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentLiabilitiesMember / us-gaap_StatementBusinessSegmentsAxis = atni_USWirelessMember / atni_TypeOfMobilityFundAxis = atni_WholesaleMobilityFundsMember
Wholesale Mobility Funds | U.S. Wireless | Other long-term liabilities
MOBILITY FUND GRANTS
Mobility Funds received	3.8atni_MobilityFundsReceived / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_StatementBusinessSegmentsAxis = atni_USWirelessMember / atni_TypeOfMobilityFundAxis = atni_WholesaleMobilityFundsMember
Universal Service Administrative Company | Letter of credit sub-facility
MOBILITY FUND GRANTS
Letters of credit posted to USAC					29.8us-gaap_LettersOfCreditOutstandingAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_LetterOfCreditMember / atni_TypeOfMobilityFundAxis = atni_UniversalServiceAdministrativeCompanyMember
Cash payment of penalty fees for default				4.6atni_PaymentOfPenaltyFeesForDefault / us-gaap_LongtermDebtTypeAxis = us-gaap_LetterOfCreditMember / atni_TypeOfMobilityFundAxis = atni_UniversalServiceAdministrativeCompanyMember
Amount terminated			$ 19.9us-gaap_ExtinguishmentOfDebtAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_LetterOfCreditMember / atni_TypeOfMobilityFundAxis = atni_UniversalServiceAdministrativeCompanyMember

X

- Definition

Represents the amount of grants received for the construction of assets which are recognized as a reduction of the cost of fixed assets, a reduction of depreciation expense over the useful lives of the assets, and as a reduction of capital expenditures.

+ References

No definition available.

+ Details

Name:	atni_GrantFundsUsedToOffsetFixedAssetRelatedCosts
Namespace Prefix:	atni_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	atni_MobilityFundLineItems
Namespace Prefix:	atni_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the amount of Mobility Fund support approved by Federal Communications Commission (FCC).

+ References

No definition available.

+ Details

Name:	atni_MobilityFundsApprovedByFederalCommunicationsCommission
Namespace Prefix:	atni_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Mobility Funds received to offset construction costs and future operations expenses.

+ References

No definition available.

+ Details

Name:	atni_MobilityFundsReceived
Namespace Prefix:	atni_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Represents the number of new funds created by Federal Communications Commission (FCC).

+ References

No definition available.

+ Details

Name:	atni_NumberOfNewFundsCreatedByCommunicationsCommission
Namespace Prefix:	atni_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the amount of cash payment of penalty fees for default.

+ References

No definition available.

+ Details

Name:	atni_PaymentOfPenaltyFeesForDefault
Namespace Prefix:	atni_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents the period over which a portion of the Mobility Funds is used to offset the costs of supporting the networks.

+ References

No definition available.

+ Details

Name:	atni_PeriodOverWhichMobilityFundUsedToOffsetCostsOfSupportingTheNetworks
Namespace Prefix:	atni_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Gross amount of debt extinguished.

+ References

No definition available.

+ Details

Name:	us-gaap_ExtinguishmentOfDebtAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	atni_TypeOfMobilityFundAxis=atni_AlltelMobilityFundsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	atni_TypeOfMobilityFundAxis=atni_UniversalServiceAdministrativeCompanyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	atni_TypeOfMobilityFundAxis=atni_WholesaleMobilityFundsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_LetterOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: