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LOSS ON DECONSOLIDATION OF SUBSIDIARY (Detail) (USD $)	3 Months Ended	1 Months Ended
	Mar. 31, 2015	Mar. 31, 2015
Loss on deconsolidation of subsidiary	$ 19,937,000us-gaap_DeconsolidationGainOrLossAmount
Island Wireless
Loss on deconsolidation of subsidiary		19,900,000us-gaap_DeconsolidationGainOrLossAmount / us-gaap_StatementBusinessSegmentsAxis = atni_IslandWirelessMember
Deconsolidation of non-controlling interests		20,000,000us-gaap_NoncontrollingInterestDecreaseFromDeconsolidation / us-gaap_StatementBusinessSegmentsAxis = atni_IslandWirelessMember
Gain arising from excess of proceeds over the carrying value of net assets		$ 100,000us-gaap_DeconsolidationRevaluationOfRetainedInvestmentGainOrLossAmount / us-gaap_StatementBusinessSegmentsAxis = atni_IslandWirelessMember

X

- Definition

The amount of the gain (loss) recognized by the parent and included in its attributable portion of net income for the period due to deconsolidation of a subsidiary or derecognition of a group of assets. The gain (loss) recognized and included in the net income attributable to the parent for the period is generally computed as the difference between: (a) the aggregate of: (1) the fair value of any consideration received; (2) the fair value of any retained noncontrolling investment in the former subsidiary at the date the subsidiary was deconsolidated; and (3) the carrying amount of any noncontrolling interest in the former subsidiary (including any accumulated other comprehensive income attributable to the noncontrolling interest) at the date the subsidiary was deconsolidated and (b) the carrying amount of the former subsidiary's assets and liabilities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 1B

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4582445-111684

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

In connection with deconsolidation of a subsidiary or derecognition of a group of assets, the portion of any gain (loss) recognized by the parent, during the period, which is related to the remeasurement of any retained investment in the former subsidiary or group of assets to its fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 1B

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4582445-111684

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of the reduction or elimination during the period of a noncontrolling interest resulting from the parent's loss of control and deconsolidation of the entity in which one or more outside parties had a noncontrolling interest.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=atni_IslandWirelessMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: