QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	12 Months Ended
Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly financial data
Total revenue	$ 88,511us-gaap_Revenues	$ 89,393us-gaap_Revenues	$ 83,269us-gaap_Revenues	$ 75,174us-gaap_Revenues	$ 77,028us-gaap_Revenues	$ 79,350us-gaap_Revenues	$ 71,625us-gaap_Revenues	$ 64,832us-gaap_Revenues	$ 336,347us-gaap_Revenues	$ 292,835us-gaap_Revenues	$ 277,796us-gaap_Revenues
Operating expenses	68,948us-gaap_OperatingExpenses	61,235us-gaap_OperatingExpenses	61,662us-gaap_OperatingExpenses	58,926us-gaap_OperatingExpenses	60,965us-gaap_OperatingExpenses	59,312us-gaap_OperatingExpenses	55,719us-gaap_OperatingExpenses	52,754us-gaap_OperatingExpenses	250,771us-gaap_OperatingExpenses	228,750us-gaap_OperatingExpenses	221,158us-gaap_OperatingExpenses
Income from operations	19,563us-gaap_OperatingIncomeLoss	28,158us-gaap_OperatingIncomeLoss	21,607us-gaap_OperatingIncomeLoss	16,248us-gaap_OperatingIncomeLoss	16,063us-gaap_OperatingIncomeLoss	20,038us-gaap_OperatingIncomeLoss	15,906us-gaap_OperatingIncomeLoss	12,078us-gaap_OperatingIncomeLoss	85,576us-gaap_OperatingIncomeLoss	64,085us-gaap_OperatingIncomeLoss	56,638us-gaap_OperatingIncomeLoss
Other income (expense), net	509us-gaap_NonoperatingIncomeExpense	325us-gaap_NonoperatingIncomeExpense	53us-gaap_NonoperatingIncomeExpense	(295)us-gaap_NonoperatingIncomeExpense	386us-gaap_NonoperatingIncomeExpense	(13,042)us-gaap_NonoperatingIncomeExpense	(2,707)us-gaap_NonoperatingIncomeExpense	(2,249)us-gaap_NonoperatingIncomeExpense	592us-gaap_NonoperatingIncomeExpense	(17,612)us-gaap_NonoperatingIncomeExpense	(11,842)us-gaap_NonoperatingIncomeExpense
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	20,072	28,483	21,660	15,953	16,449	6,996	13,199	9,829	86,168	46,473	44,796
Income tax	5,689us-gaap_IncomeTaxExpenseBenefit	9,569us-gaap_IncomeTaxExpenseBenefit	7,338us-gaap_IncomeTaxExpenseBenefit	5,552us-gaap_IncomeTaxExpenseBenefit	(1,758)us-gaap_IncomeTaxExpenseBenefit	2,481us-gaap_IncomeTaxExpenseBenefit	4,868us-gaap_IncomeTaxExpenseBenefit	3,945us-gaap_IncomeTaxExpenseBenefit	28,148us-gaap_IncomeTaxExpenseBenefit	9,536us-gaap_IncomeTaxExpenseBenefit	20,831us-gaap_IncomeTaxExpenseBenefit
INCOME FROM CONTINUING OPERATIONS	14,383	18,914	14,322	10,401	18,207	4,515	8,331	5,884	58,020	36,937	23,965
Income from discontinued operations:
Income from discontinued operations, net of tax						(1,960)	3,092	4,034		5,166	29,202
Gain on sale of discontinued operations, net of tax	1,102				1,905	305,197			1,102	307,102
Income from discontinued operations, net of tax	1,102				1,905	303,237	3,092	4,034	1,102	312,268	29,202
NET INCOME	15,485us-gaap_ProfitLoss	18,914us-gaap_ProfitLoss	14,322us-gaap_ProfitLoss	10,401us-gaap_ProfitLoss	20,112us-gaap_ProfitLoss	307,752us-gaap_ProfitLoss	11,423us-gaap_ProfitLoss	9,918us-gaap_ProfitLoss	59,122us-gaap_ProfitLoss	349,205us-gaap_ProfitLoss	53,167us-gaap_ProfitLoss
Net income attributable to non-controlling interests, net of tax:
Continuing operations	(2,854)	(2,747)	(2,809)	(2,560)	(2,055)	(2,945)	(1,934)	(1,055)	(10,970)	(7,989)	(3,145)
Discontinued operations						116	(630)	(87)		(601)	(1,090)
Disposal of discontinued operations					(200)	(28,699)				(28,899)
Net income attributable to non-controlling interests, net of tax	(2,854)	(2,747)	(2,809)	(2,560)	(2,255)	(31,528)	(2,564)	(1,142)	(10,970)	(37,489)	(4,235)
NET INCOME ATTRIBUTABLE TO ATLANTIC TELE-NETWORK, INC. STOCKHOLDERS	$ 12,631	$ 16,167	$ 11,513	$ 7,841	$ 17,857	$ 276,224	$ 8,859	$ 8,776	$ 48,152	$ 311,716	$ 48,932
NET INCOME PER WEIGHTED AVERAGE BASIC SHARE ATTRIBUTABLE TO ATLANTIC TELE-NETWORK, INC. STOCKHOLDERS:
Continuing operations (in dollars per share)	$ 0.72	$ 1.02	$ 0.72	$ 0.50	$ 1.02	$ 0.10	$ 0.41	$ 0.31	$ 2.96	$ 1.84	$ 1.34
Discontinued operations:
Discontinued operations (in dollars per share)						$ (0.12)	$ 0.16	$ 0.25		$ 0.29	$ 1.81
Gain on sale of discontinued operations (in dollars per share)	$ 0.07				$ 0.15	$ 17.57			$ 0.07	$ 17.72
Total discontinued operations (in dollars per share)	$ 0.07				$ 0.15	$ 17.45	$ 0.16	$ 0.25	$ 0.07	$ 18.01	$ 1.81
Total (in dollars per share)	$ 0.79us-gaap_EarningsPerShareBasic	$ 1.02us-gaap_EarningsPerShareBasic	$ 0.72us-gaap_EarningsPerShareBasic	$ 0.50us-gaap_EarningsPerShareBasic	$ 1.17us-gaap_EarningsPerShareBasic	$ 17.55us-gaap_EarningsPerShareBasic	$ 0.57us-gaap_EarningsPerShareBasic	$ 0.56us-gaap_EarningsPerShareBasic	$ 3.03us-gaap_EarningsPerShareBasic	$ 19.85us-gaap_EarningsPerShareBasic	$ 3.15us-gaap_EarningsPerShareBasic
NET INCOME PER WEIGHTED AVERAGE DILUTED SHARE ATTRIBUTABLE TO ATLANTIC TELE-NETWORK, INC. STOCKHOLDERS:
Continued operations (in dollars per share)	$ 0.72	$ 1.01	$ 0.72	$ 0.49	$ 1.02	$ 0.10	$ 0.40	$ 0.31	$ 2.94	$ 1.83	$ 1.33
Discontinued operations:
Discontinued operations (in dollars per share)						$ (0.12)	$ 0.16	$ 0.25		$ 0.29	$ 1.80
Gain on sale of discontinued operations (in dollars per share)	$ 0.07				$ 0.14	$ 17.45			$ 0.07	$ 17.59
Total discontinued operations (in dollars per share)	$ 0.07				$ 0.14	$ 17.33	$ 0.16	$ 0.25	$ 0.07	$ 17.88	$ 1.80
Total (in dollars per share)	$ 0.79us-gaap_EarningsPerShareDiluted	$ 1.01us-gaap_EarningsPerShareDiluted	$ 0.72us-gaap_EarningsPerShareDiluted	$ 0.49us-gaap_EarningsPerShareDiluted	$ 1.16us-gaap_EarningsPerShareDiluted	$ 17.43us-gaap_EarningsPerShareDiluted	$ 0.56us-gaap_EarningsPerShareDiluted	$ 0.56us-gaap_EarningsPerShareDiluted	$ 3.01us-gaap_EarningsPerShareDiluted	$ 19.71us-gaap_EarningsPerShareDiluted	$ 3.13us-gaap_EarningsPerShareDiluted

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