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INCOME TAXES (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reconciliation from the tax computed at statutory income tax rates to the Company's income tax expense
Tax computed at statutory U.S. federal income tax rates									$ 30,160us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 16,270us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 15,679us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Valuation allowance									(887)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	711us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	832us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Foreign tax reserve									2,095atni_IncomeTaxReconciliationForeignTaxReserve	2,081atni_IncomeTaxReconciliationForeignTaxReserve	2,359atni_IncomeTaxReconciliationForeignTaxReserve
State taxes									1,813us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	1,032us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	906us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Research and development credit											(1,971)us-gaap_IncomeTaxReconciliationTaxCreditsResearch
Other, net									(191)us-gaap_IncomeTaxReconciliationOtherAdjustments	516us-gaap_IncomeTaxReconciliationOtherAdjustments	1,711us-gaap_IncomeTaxReconciliationOtherAdjustments
Income tax expense	5,689us-gaap_IncomeTaxExpenseBenefit	9,569us-gaap_IncomeTaxExpenseBenefit	7,338us-gaap_IncomeTaxExpenseBenefit	5,552us-gaap_IncomeTaxExpenseBenefit	(1,758)us-gaap_IncomeTaxExpenseBenefit	2,481us-gaap_IncomeTaxExpenseBenefit	4,868us-gaap_IncomeTaxExpenseBenefit	3,945us-gaap_IncomeTaxExpenseBenefit	28,148us-gaap_IncomeTaxExpenseBenefit	9,536us-gaap_IncomeTaxExpenseBenefit	20,831us-gaap_IncomeTaxExpenseBenefit
Guyana
Reconciliation from the tax computed at statutory income tax rates to the Company's income tax expense
Income taxes in excess (below) of statutory U.S. tax rates									(130)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential / us-gaap_IncomeTaxAuthorityAxis = country_GY	701us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential / us-gaap_IncomeTaxAuthorityAxis = country_GY	812us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential / us-gaap_IncomeTaxAuthorityAxis = country_GY
Bermuda and Turks & Caicos
Reconciliation from the tax computed at statutory income tax rates to the Company's income tax expense
Income taxes in excess (below) of statutory U.S. tax rates									(4,712)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential / us-gaap_IncomeTaxAuthorityAxis = atni_BermudaAndTurksAndCaicosMember	(3,203)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential / us-gaap_IncomeTaxAuthorityAxis = atni_BermudaAndTurksAndCaicosMember	503us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential / us-gaap_IncomeTaxAuthorityAxis = atni_BermudaAndTurksAndCaicosMember
Turks & Caicos intercompany note receivable write-down
Reconciliation from the tax computed at statutory income tax rates to the Company's income tax expense
Income taxes in excess (below) of statutory U.S. tax rates										$ (8,572)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential / us-gaap_IncomeTaxAuthorityAxis = country_TC

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The portion of the difference between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to the foreign tax reserve made under enacted tax laws.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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