XML 52 R41.htm IDEA: XBRL DOCUMENT
v3.8.0.1

GOVERNMENT GRANTS (Details) - Mobility Funds - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2017 | Sep. 30, 2017
MOBILITY FUND GRANTS |  |
Mobility Funds received |  | $ 21.1
Period over which a portion of the Mobility Funds is used to offset the costs of supporting the networks | 5 years |
U.S. Telecom |  |
MOBILITY FUND GRANTS |  |
Mobility Funds received |  | 21.1
Grant funds used to offset operating expenses |  | 13.9
Mobility funds received and recorded to date |  | 9.0
U.S. Telecom | Property, Plant and Equipment |  |
MOBILITY FUND GRANTS |  |
Grant funds used to offset fixed asset related costs |  | 7.2
U.S. Telecom | Other current liabilities |  |
MOBILITY FUND GRANTS |  |
Grant funds used to offset operating expenses |  | $ 4.9

X
- Definition Represents the amount of grants received for the construction of assets which are recognized as a reduction of the cost of fixed assets, a reduction of depreciation expense over the useful lives of the assets, and as a reduction of capital expenditures. + References No definition available. + Details
Name: | atni_GrantFundsUsedToOffsetFixedAssetRelatedCosts
Namespace Prefix: | atni_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the amount of grants received that offset operating costs. + References No definition available. + Details
Name: | atni_GrantFundsUsedToOffsetOperatingExpenses
Namespace Prefix: | atni_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | atni_MobilityFundLineItems
Namespace Prefix: | atni_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of Mobility Funds received by the entity since inception of the grant. + References No definition available. + Details
Name: | atni_MobilityFundsReceived
Namespace Prefix: | atni_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of Mobility Funds received by the entity since inception of the grant and recorded to date. + References No definition available. + Details
Name: | atni_MobilityFundsReceivedAndRecordedToDate
Namespace Prefix: | atni_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the period over which a portion of the Mobility Funds is used to offset the costs of supporting the networks. + References No definition available. + Details
Name: | atni_PeriodOverWhichMobilityFundUsedToOffsetCostsOfSupportingTheNetworks
Namespace Prefix: | atni_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=atni_UsTelecommunicationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_PropertyPlantAndEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_OtherCurrentLiabilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |