XML 54 R39.htm IDEA: XBRL DOCUMENT
v3.5.0.2

COMMITMENTS AND CONTINGENCIES - Narrative (Details) AWG in Millions, $ in Millions | 1 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 30, 2007 USD ($) | Jun. 30, 2016 AWG | Jun. 30, 2016 USD ($) | Dec. 31, 2011 USD ($)
Commitments and contingencies |  |  |  |
Renewal fee of telecommunications license |  | AWG 7.2 | $ 4.0 |
Contingency related to spectrum fees |  |  |  |
Commitments and contingencies |  |  |  |
Spectrum fees paid |  |  |  | $ 2.6
Letter of credit sub-facility |  |  |  |
Commitments and contingencies |  |  |  |
Outstanding letters of credit |  |  | $ 10.6 |
Universal Service Administrative Company |  |  |  |
Commitments and contingencies |  |  |  |
Commitment fee (as a percent) |  | 1.75% | 1.75% |
Lawsuit filed by CTL |  |  |  |
Commitments and contingencies |  |  |  |
Damages asserted | $ 200.0 |  |  |
Litigation proceedings and disputes in Guyana |  |  |  |
Commitments and contingencies |  |  |  |
Period for which litigation proceedings and other disputes have not been the subject of discussions or other significant activity |  | 5 years | 5 years |
Lawsuit filed by GT&T against Digicel |  |  |  |
Commitments and contingencies |  |  |  |
Damages asserted |  |  | $ 9.0 |
Punitive damages |  |  | 5.0 |
Legal claims regarding tax filings with the Guyana Revenue Authority |  |  |  |
Commitments and contingencies |  |  |  |
Future payments related to disputed tax assessments |  |  | 32.4 |
Accrued contingent liability |  |  | $ 5.0 |
Legal claims regarding tax filings with the Guyana Revenue Authority | Minimum |  |  |  |
Commitments and contingencies |  |  |  |
Percentage of return on investment ensured by the government of Guyana |  | 15.00% | 15.00% |

X
- 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

X
- 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

X
- 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

X
- 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

X
- 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

X
- 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

X
- 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

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of loss contingency liability. + 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 + Details
Name: | us-gaap_LossContingencyAccrualAtCarryingValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 Reference 3: 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 + Details
Name: | us-gaap_LossContingencyDamagesSoughtValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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

X
- Details
Name: | us-gaap_LossContingenciesByNatureOfContingencyAxis=atni_ContingencyRelatedToSpectrumFeesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_LetterOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | atni_TypeOfMobilityFundAxis=atni_UniversalServiceAdministrativeCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LitigationCaseAxis=atni_LawsuitFiledByCaribbeanTelecommunicationsLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LitigationCaseAxis=atni_LitigationProceedingsAndDisputesInGuyanaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LitigationCaseAxis=atni_LawsuitFiledByGuyanaTelephoneAndTelegraphLimitedAgainstDigicelMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LitigationCaseAxis=atni_LegalClaimsRegardingTaxFilingsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |