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GOODWILL AND INTANGIBLE ASSETS (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 item | Dec. 31, 2013
Goodwill |  |
Impairment charge | $ 0 us-gaap_GoodwillImpairmentLoss | $ 0 us-gaap_GoodwillImpairmentLoss
Changes in the carrying amounts of goodwill | 0 us-gaap_GoodwillPeriodIncreaseDecrease | 0 us-gaap_GoodwillPeriodIncreaseDecrease
Number of reporting units where fair value exceeded carrying value | 1 atni_NumberOfReportingUnitsWhereFairValueExceededCarryingValue |
Percentage by which fair value of one reporting unit exceeded carrying value | 24.00%atni_PercentageByWhichFairValueOfOneReportingUnitExceededCarryingValue |
Goodwill balance | 45,077,000 us-gaap_Goodwill | 45,077,000 us-gaap_Goodwill
Certain segment reporting unit |  |
Goodwill |  |
Goodwill balance | $ 7,500,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = atni_CertainSegmentReportingUnitMember | $ 7,500,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = atni_CertainSegmentReportingUnitMember

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- Definition Represents the number of reporting units where fair value exceeded carrying value. + References No definition available. + Details
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Period Type: | duration

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- Definition Represents the percentage by which fair value of one reporting unit exceeded carrying value. + References No definition available. + Details
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Namespace Prefix: | atni_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | instant

X
- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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Balance Type: | debit
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- Details
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- Definition Amount of increase (decrease) of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Details
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