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LONG-TERM DEBT (Details) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Dec. 19, 2014
Term loans assumed in Ahana acquisition
Term loans assumed in Ahana acquisition	$ 37,394,000us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities	$ 38,877,000us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities
Less: current portion	(6,150,000)us-gaap_LongTermDebtCurrent	(6,083,000)us-gaap_LongTermDebtCurrent
Total long term debt	31,244,000us-gaap_LongTermDebtNoncurrent	32,794,000us-gaap_LongTermDebtNoncurrent
Amended Credit Facility
Term loans assumed in Ahana acquisition
Borrowings	0us-gaap_ProceedsFromLinesOfCredit / us-gaap_CreditFacilityAxis = atni_AmendmentToCreditFacilityMember	0us-gaap_ProceedsFromLinesOfCredit / us-gaap_CreditFacilityAxis = atni_AmendmentToCreditFacilityMember
Revolving credit facility | Amended Credit Facility
Term loans assumed in Ahana acquisition
Maximum borrowing capacity			225,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = atni_AmendmentToCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember
Revolving credit facility | Amended Credit Facility | LIBOR
Term loans assumed in Ahana acquisition
Description of variable rate basis	LIBOR
Revolving credit facility | Amended Credit Facility | Base rate
Term loans assumed in Ahana acquisition
Description of variable rate basis	base rate
Revolving credit facility | Amended Credit Facility | Minimum
Term loans assumed in Ahana acquisition
Commitment fee (as a percent)	0.175%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage / us-gaap_CreditFacilityAxis = atni_AmendmentToCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Revolving credit facility | Amended Credit Facility | Minimum | LIBOR
Term loans assumed in Ahana acquisition
Basis spread on variable rate (as a percent)	1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = atni_AmendmentToCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember
Revolving credit facility | Amended Credit Facility | Minimum | Base rate
Term loans assumed in Ahana acquisition
Basis spread on variable rate (as a percent)	0.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = atni_AmendmentToCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_VariableRateAxis = us-gaap_BaseRateMember
Revolving credit facility | Amended Credit Facility | Maximum
Term loans assumed in Ahana acquisition
Commitment fee (as a percent)	0.25%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage / us-gaap_CreditFacilityAxis = atni_AmendmentToCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Revolving credit facility | Amended Credit Facility | Maximum | LIBOR
Term loans assumed in Ahana acquisition
Basis spread on variable rate (as a percent)	1.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = atni_AmendmentToCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember
Revolving credit facility | Amended Credit Facility | Maximum | Base rate
Term loans assumed in Ahana acquisition
Basis spread on variable rate (as a percent)	0.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = atni_AmendmentToCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_VariableRateAxis = us-gaap_BaseRateMember
Swingline sub-facility | Amended Credit Facility
Term loans assumed in Ahana acquisition
Maximum borrowing capacity			10,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = atni_AmendmentToCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = atni_SwinglineSubFacilityMember
Swingline sub-facility | Amended Credit Facility | Base rate
Term loans assumed in Ahana acquisition
Description of variable rate basis	Base rate
Swingline sub-facility | Amended Credit Facility | One-week LIBOR
Term loans assumed in Ahana acquisition
Description of variable rate basis	one-week LIBOR
Swingline sub-facility | Amended Credit Facility | One-month LIBOR
Term loans assumed in Ahana acquisition
Description of variable rate basis	one-month LIBOR
Swingline sub-facility | Amended Credit Facility | Prime Rate
Term loans assumed in Ahana acquisition
Description of variable rate basis	Prime rate
Swingline sub-facility | Amended Credit Facility | Federal Funds Effective Rate
Term loans assumed in Ahana acquisition
Description of variable rate basis	federal funds effective rate
Basis spread on variable rate (as a percent)	0.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = atni_AmendmentToCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = atni_SwinglineSubFacilityMember / us-gaap_VariableRateAxis = us-gaap_FederalFundsEffectiveSwapRateMember
Swingline sub-facility | Amended Credit Facility | Minimum | Base rate
Term loans assumed in Ahana acquisition
Basis spread on variable rate (as a percent)	1.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = atni_AmendmentToCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = atni_SwinglineSubFacilityMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_VariableRateAxis = us-gaap_BaseRateMember
Letter of credit sub-facility
Term loans assumed in Ahana acquisition
Outstanding letters of credit	10,600,000us-gaap_LettersOfCreditOutstandingAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_LetterOfCreditMember	10,600,000us-gaap_LettersOfCreditOutstandingAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_LetterOfCreditMember
Letter of credit sub-facility | Universal Service Administrative Company
Term loans assumed in Ahana acquisition
Outstanding letters of credit	10,600,000us-gaap_LettersOfCreditOutstandingAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_LetterOfCreditMember / atni_TypeOfMobilityFundAxis = atni_UniversalServiceAdministrativeCompanyMember
Letter of credit sub-facility | Amended Credit Facility
Term loans assumed in Ahana acquisition
Maximum borrowing capacity			10,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = atni_AmendmentToCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LetterOfCreditMember
Letter of credit sub-facility | Amended Credit Facility | Alltel Mobility Funds
Term loans assumed in Ahana acquisition
Maximum borrowing capacity			25,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = atni_AmendmentToCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LetterOfCreditMember / atni_TypeOfMobilityFundAxis = atni_AlltelMobilityFundsMember
Ahana Debt
Term loans assumed in Ahana acquisition
Long-term debt	38,900,000atni_LongTermDebtNoncurrentCarryingAmount / us-gaap_LongtermDebtTypeAxis = atni_AhanaDebtMember
Ahana Debt | Public Service Electric & Gas
Term loans assumed in Ahana acquisition
Long-term debt	$ 2,800,000atni_LongTermDebtNoncurrentCarryingAmount / us-gaap_LongtermDebtTypeAxis = atni_AhanaDebtMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = atni_PublicServiceElectricAndGasMember
Effective interest rate (as a percent)	11.30%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = atni_AhanaDebtMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = atni_PublicServiceElectricAndGasMember
Ahana Debt | Minimum
Term loans assumed in Ahana acquisition
Effective interest rate (as a percent)	4.50%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = atni_AhanaDebtMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Ahana Debt | Maximum
Term loans assumed in Ahana acquisition
Effective interest rate (as a percent)	6.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = atni_AhanaDebtMember / us-gaap_RangeAxis = us-gaap_MaximumMember

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- Definition

Carrying amount of long-term debt, before deducting unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt and capital lease obligations including current maturities.

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