XML 59 R44.htm IDEA: XBRL DOCUMENT
v3.8.0.1

IMPACT OF THE HURRICANES IRMA AND MARIA (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 28, 2018 | Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
IMPACT OF THE HURRICANES IRMA AND MARIA |  |  |  |
Pre-tax loss |  | $ (1,618) | $ (14,712) |
Insurance proceeds |  | $ 34,606 |  |
HURRICANES IRMA AND MARIA |  |  |  |
IMPACT OF THE HURRICANES IRMA AND MARIA |  |  |  |
Pre-tax loss |  |  |  | $ 4,000
Loss on damaged assets from Hurricanes |  |  |  | 35,400
Insurance proceeds | $ 34,600 |  |  |
Additional operating expenses |  |  |  | $ 3,200
Discounted rate used for cash flows |  |  |  | 14.50%
Impairment of goodwill and intangible assets |  |  |  | $ 0

X
- Definition Represents the amount of additional operating expenses due to business interruption. + References No definition available. + Details
Name: | atni_BusinessInterruptionAdditionalOperatingExpenses
Namespace Prefix: | atni_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the discounted rate used to compute cash flows. + References No definition available. + Details
Name: | atni_FairValueOfDiscountedRateUsedToComputeCashFlows
Namespace Prefix: | atni_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of loss on damaged asset from hurricanes. + References No definition available. + Details
Name: | atni_LossOnDamagedAssetFromHurricanes
Namespace Prefix: | atni_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The net amount (to the extent disclosed within this portion of the income statement) by which an insurance settlement exceeds incremental costs incurred from the event causing an interruption of business, plus the insurance award for earnings lost from the event, such as a natural catastrophe. + References No definition available. + Details
Name: | atni_ProceedsFromNaturalDisastersInsurancePolicies
Namespace Prefix: | atni_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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_BusinessInterruptionLossLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Total loss recognized during the period from the impairment of goodwill plus the loss recognized in the period resulting from the impairment of the carrying amount of intangible assets, other than goodwill. + References No definition available. + Details
Name: | us-gaap_GoodwillAndIntangibleAssetImpairment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68072869&loc=d3e41242-110953 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(10)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(15)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(8)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 + Details
Name: | us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_BusinessInterruptionLossAxis=us-gaap_NaturalDisastersAndOtherCasualtyEventsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |