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EQUITY (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Stockholders' equity    
Equity, beginning of period $ 738,182us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest $ 699,855us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Stock-based compensation 1,224us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue 1,058us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
Comprehensive income:    
Net income (492)us-gaap_ProfitLoss 10,401us-gaap_ProfitLoss
Other comprehensive income    
Total comprehensive income (492)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest 10,401us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
Issuance of common stock upon exercise of stock options 651us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised 930us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
Dividends declared on common stock (7,712)us-gaap_DividendsCommonStock (4,305)us-gaap_DividendsCommonStock
Distributions to non-controlling interests   (1,482)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
Purchase of treasury stock (1,884)us-gaap_TreasuryStockValueAcquiredCostMethod (1,756)us-gaap_TreasuryStockValueAcquiredCostMethod
Disposition of non-controlling interests 20,013us-gaap_MinorityInterestDecreaseFromRedemptions  
Equity, end of period 749,982us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 704,701us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Atlantic Tele-Network, Inc.    
Stockholders' equity    
Equity, beginning of period 677,222us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
643,330us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
Stock-based compensation 1,224us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
1,058us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
Comprehensive income:    
Net income (3,269)us-gaap_ProfitLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
7,841us-gaap_ProfitLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
Other comprehensive income    
Total comprehensive income (3,269)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
7,841us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
Issuance of common stock upon exercise of stock options 651us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
930us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
Dividends declared on common stock (4,646)us-gaap_DividendsCommonStock
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
(4,305)us-gaap_DividendsCommonStock
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
Purchase of treasury stock (1,884)us-gaap_TreasuryStockValueAcquiredCostMethod
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
(1,756)us-gaap_TreasuryStockValueAcquiredCostMethod
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
Equity, end of period 669,298us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
647,098us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
Non-Controlling Interests    
Stockholders' equity    
Equity, beginning of period 60,960us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
56,525us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
Comprehensive income:    
Net income 2,777us-gaap_ProfitLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
2,560us-gaap_ProfitLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
Other comprehensive income    
Total comprehensive income 2,777us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
2,560us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
Dividends declared on common stock (3,066)us-gaap_DividendsCommonStock
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
 
Distributions to non-controlling interests   (1,482)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
Disposition of non-controlling interests 20,013us-gaap_MinorityInterestDecreaseFromRedemptions
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
 
Equity, end of period $ 80,684us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
$ 57,603us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember