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FIXED ASSETS (Details) (USD $)	12 Months Ended			24 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014
Fixed Assets
Total plant in service	$ 719,435,000atni_PropertyPlantAndEquipmentGrossExcludingConstructionInProgress	$ 561,251,000atni_PropertyPlantAndEquipmentGrossExcludingConstructionInProgress		719,435,000atni_PropertyPlantAndEquipmentGrossExcludingConstructionInProgress
Total property, plant, and equipment in service	763,417,000us-gaap_PropertyPlantAndEquipmentGross	606,912,000us-gaap_PropertyPlantAndEquipmentGross		763,417,000us-gaap_PropertyPlantAndEquipmentGross
Less: Accumulated depreciation	(393,835,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	(352,280,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment		(393,835,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Net fixed assets	369,582,000us-gaap_PropertyPlantAndEquipmentNet	254,632,000us-gaap_PropertyPlantAndEquipmentNet		369,582,000us-gaap_PropertyPlantAndEquipmentNet
Depreciation and amortization	50,300,000us-gaap_DepreciationAndAmortization	48,300,000us-gaap_DepreciationAndAmortization	50,000,000us-gaap_DepreciationAndAmortization
Capital expenditures offset by grants	2,300,000atni_CapitalExpendituresOffsetByGrants	31,600,000atni_CapitalExpendituresOffsetByGrants	30,600,000atni_CapitalExpendituresOffsetByGrants
Minimum
Fixed Assets
Useful Life	3 years
Maximum
Fixed Assets
Useful Life	39 years
Telecommunications equipment and towers
Fixed Assets
Total plant in service	514,814,000atni_PropertyPlantAndEquipmentGrossExcludingConstructionInProgress / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember	471,265,000atni_PropertyPlantAndEquipmentGrossExcludingConstructionInProgress / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember		514,814,000atni_PropertyPlantAndEquipmentGrossExcludingConstructionInProgress / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember
Telecommunications equipment and towers | Minimum
Fixed Assets
Useful Life				5 years
Telecommunications equipment and towers | Maximum
Fixed Assets
Useful Life				15 years
Solar assets
Fixed Assets
Total plant in service	111,446,000atni_PropertyPlantAndEquipmentGrossExcludingConstructionInProgress / us-gaap_PropertyPlantAndEquipmentByTypeAxis = atni_SolarAssetsMember			111,446,000atni_PropertyPlantAndEquipmentGrossExcludingConstructionInProgress / us-gaap_PropertyPlantAndEquipmentByTypeAxis = atni_SolarAssetsMember
Solar assets | Minimum
Fixed Assets
Useful Life				20 years
Solar assets | Maximum
Fixed Assets
Useful Life				23 years
Office and computer equipment
Fixed Assets
Total plant in service	46,757,000atni_PropertyPlantAndEquipmentGrossExcludingConstructionInProgress / us-gaap_PropertyPlantAndEquipmentByTypeAxis = atni_OfficeAndComputerEquipmentMember	46,680,000atni_PropertyPlantAndEquipmentGrossExcludingConstructionInProgress / us-gaap_PropertyPlantAndEquipmentByTypeAxis = atni_OfficeAndComputerEquipmentMember		46,757,000atni_PropertyPlantAndEquipmentGrossExcludingConstructionInProgress / us-gaap_PropertyPlantAndEquipmentByTypeAxis = atni_OfficeAndComputerEquipmentMember
Office and computer equipment | Minimum
Fixed Assets
Useful Life				3 years
Office and computer equipment | Maximum
Fixed Assets
Useful Life				10 years
Buildings
Fixed Assets
Total plant in service	18,079,000atni_PropertyPlantAndEquipmentGrossExcludingConstructionInProgress / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingMember	18,002,000atni_PropertyPlantAndEquipmentGrossExcludingConstructionInProgress / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingMember		18,079,000atni_PropertyPlantAndEquipmentGrossExcludingConstructionInProgress / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingMember
Buildings | Minimum
Fixed Assets
Useful Life				15 years
Buildings | Maximum
Fixed Assets
Useful Life				39 years
Transportation vehicles
Fixed Assets
Total plant in service	7,589,000atni_PropertyPlantAndEquipmentGrossExcludingConstructionInProgress / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_VehiclesMember	6,984,000atni_PropertyPlantAndEquipmentGrossExcludingConstructionInProgress / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_VehiclesMember		7,589,000atni_PropertyPlantAndEquipmentGrossExcludingConstructionInProgress / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_VehiclesMember
Transportation vehicles | Minimum
Fixed Assets
Useful Life				3 years
Transportation vehicles | Maximum
Fixed Assets
Useful Life				10 years
Leasehold improvements
Fixed Assets
Total plant in service	11,494,000atni_PropertyPlantAndEquipmentGrossExcludingConstructionInProgress / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LeaseholdImprovementsMember	11,380,000atni_PropertyPlantAndEquipmentGrossExcludingConstructionInProgress / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LeaseholdImprovementsMember		11,494,000atni_PropertyPlantAndEquipmentGrossExcludingConstructionInProgress / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LeaseholdImprovementsMember
Land
Fixed Assets
Total plant in service	1,146,000atni_PropertyPlantAndEquipmentGrossExcludingConstructionInProgress / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandMember	1,162,000atni_PropertyPlantAndEquipmentGrossExcludingConstructionInProgress / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandMember		1,146,000atni_PropertyPlantAndEquipmentGrossExcludingConstructionInProgress / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandMember
Furniture and fixtures
Fixed Assets
Total plant in service	8,110,000atni_PropertyPlantAndEquipmentGrossExcludingConstructionInProgress / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_FurnitureAndFixturesMember	5,778,000atni_PropertyPlantAndEquipmentGrossExcludingConstructionInProgress / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_FurnitureAndFixturesMember		8,110,000atni_PropertyPlantAndEquipmentGrossExcludingConstructionInProgress / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_FurnitureAndFixturesMember
Furniture and fixtures | Minimum
Fixed Assets
Useful Life				5 years
Furniture and fixtures | Maximum
Fixed Assets
Useful Life				10 years
Construction in progress
Fixed Assets
Total property, plant, and equipment in service	$ 43,982,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ConstructionInProgressMember	$ 45,661,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ConstructionInProgressMember		43,982,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ConstructionInProgressMember

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