XML 20 R78.htm IDEA: XBRL DOCUMENT v2.4.1.9
SUBSEQUENT EVENT (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended 3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Dec. 31, 2014
Dec. 31, 2013
Mar. 31, 2015
SUBSEQUENT EVENT            
Gain (loss) on sale of assets $ 1,102us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax $ 1,905us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax $ 305,197us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax $ 1,102us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax $ 307,102us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax  
Subsequent event | Turks And Caicos Island Retail Wireless | Cable And Wireless Limited            
SUBSEQUENT EVENT            
Gain (loss) on sale of assets           $ 19,000us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= atni_TurksAndCaicosIslandRetailWirelessMember
/ dei_LegalEntityAxis
= atni_CableAndWirelessLimitedMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember