Represents the amount of pending awards of mobility fund grants to be secured against the issuance of debt instrument.

No definition available.

Name:	atni_AmountOfPendingAwardsToBeSecuredAgainstIssuanceOfDebtInstrument
Namespace Prefix:	atni_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Represents the total amounts drawn down on issued letters of credit as of the reporting date.

+ References

No definition available.

+ Details

Name:	atni_DrawDownsAgainstIssuedLettersOfCredit
Namespace Prefix:	atni_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Represents the amount of actual damages that the plaintiff seeks in the legal matter.

+ References

No definition available.

+ Details

Name:	atni_LossContingencyActualDamages
Namespace Prefix:	atni_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Represents the return on investment ensured by the government of Guyana, in which if the entity's return on investment falls below the ensured percentage, the Government of Guyana is obligated to reimburse any necessary amount.

+ References

No definition available.

+ Details

Name:	atni_LossContingencyMinimumReturnOnInvestmentEnsuredByGovernmentOfGuyana
Namespace Prefix:	atni_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the period for which litigation proceedings and other disputes, while not conclusively resolved, have not been the subject of discussions or other significant activity.

+ References

No definition available.

+ Details

Name:	atni_LossContingencyPeriodForWhichLitigationProceedingsWereNotSubjectOfDiscussionsOrOtherSignificantActivity
Namespace Prefix:	atni_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the amount of punitive damages that the plaintiff seeks in the legal matter.

+ References

No definition available.

+ Details

Name:	atni_LossContingencyPunitiveDamages
Namespace Prefix:	atni_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Represents the amount of renewal fee of telecommunications license.

+ References

No definition available.

+ Details

Name:	atni_LossContingencyRenewalFeeOfTelecommunicationsLicense
Namespace Prefix:	atni_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Represents the amount of spectrum fees paid as full settlement.

+ References

No definition available.

+ Details

Name:	atni_LossContingencySpectrumFeesPaid
Namespace Prefix:	atni_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Gross amount of debt extinguished.

+ References

No definition available.

+ Details

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

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_LossContingenciesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The value (monetary amount) of the award the plaintiff seeks in the legal matter.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 4

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 9

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349

+ Details

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

- Definition

Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 4

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 9

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349

+ Details

Name:	us-gaap_LossContingencyEstimateOfPossibleLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

COMMITMENTS AND CONTINGENCIES (Details) In Millions, unless otherwise specified	1 Months Ended		12 Months Ended		0 Months Ended			0 Months Ended			0 Months Ended				1 Months Ended	12 Months Ended				12 Months Ended
	Jan. 31, 2014 USD ($)	Jan. 31, 2014 AWG	Dec. 31, 2011 Contingency related to spectrum fees USD ($)	Dec. 31, 2014 Letter of credit sub-facility USD ($)	Jun. 17, 2013 Letter of credit sub-facility Amended Credit Facility	Dec. 31, 2014 Letter of credit sub-facility Amended Credit Facility USD ($)	Dec. 19, 2014 Letter of credit sub-facility Amended Credit Facility USD ($)	Nov. 14, 2013 Alltel Mobility Funds Letter of credit sub-facility USD ($)	Jun. 17, 2013 Alltel Mobility Funds Letter of credit sub-facility Amended Credit Facility USD ($)	Dec. 19, 2014 Alltel Mobility Funds Letter of credit sub-facility Amended Credit Facility USD ($)	Nov. 14, 2013 Universal Service Administrative Company Letter of credit sub-facility USD ($)	Jun. 30, 2013 Universal Service Administrative Company Letter of credit sub-facility USD ($)	Dec. 31, 2013 Universal Service Administrative Company Letter of credit sub-facility Amended Credit Facility USD ($)	Jun. 17, 2013 Universal Service Administrative Company Letter of credit sub-facility Amended Credit Facility USD ($)	Nov. 30, 2007 Lawsuit filed by CTL Minimum USD ($)	Dec. 31, 2014 Litigation proceedings and disputes in Guyana	Feb. 17, 2010 Lawsuit filed by GT&T against Digicel USD ($)	Feb. 17, 2010 Lawsuit filed by GT&T against Digicel Minimum USD ($)	Dec. 31, 2014 Legal claims regarding tax filings with the Guyana Revenue Authority USD ($)	Dec. 31, 2014 Legal claims regarding tax filings with the Guyana Revenue Authority Minimum
Commitments and contingencies
Maximum borrowing capacity						$ 55.0	$ 10.0			$ 25.0
Amount of pending awards of mobility fund grants									68.8
Termination of facility								19.9			19.9
Letters of credit posted to USAC				10.6								29.8	9.9	29.8
Commitment fee (as a percent)					1.75%
Draw downs against issued letters of credit													0
Period for which litigation proceedings and other disputes have not been the subject of discussions or other significant activity																5 years
Spectrum fees paid			2.6
Damages asserted															200
Actual damages																		9
Punitive damages																	5
Future payments related to disputed tax assessments																			33.2
Percentage of return on investment ensured by the government of Guyana																				15.00%
Renewal fee of telecommunications license	$ 4.0	7.2