CONSOLIDATED INCOME STATEMENTS (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
REVENUE:
Total revenue	$ 336,347us-gaap_Revenues	$ 292,835us-gaap_Revenues	$ 277,796us-gaap_Revenues
OPERATING EXPENSES (excluding depreciation and amortization unless otherwise indicated):
Termination and access fees	64,177atni_TerminationAndAccessFees	55,747atni_TerminationAndAccessFees	56,814atni_TerminationAndAccessFees
Engineering and operations	40,269atni_EngineeringAndOperationExpense	38,904atni_EngineeringAndOperationExpense	40,018atni_EngineeringAndOperationExpense
Sales and marketing	20,994us-gaap_SellingAndMarketingExpense	17,757us-gaap_SellingAndMarketingExpense	18,981us-gaap_SellingAndMarketingExpense
Equipment expense	13,290atni_CostOfEquipmentRevenue	12,876atni_CostOfEquipmentRevenue	13,381atni_CostOfEquipmentRevenue
General and administrative	57,848us-gaap_GeneralAndAdministrativeExpense	53,093us-gaap_GeneralAndAdministrativeExpense	49,625us-gaap_GeneralAndAdministrativeExpense
Transaction-related charges	2,959	2,712	7
Depreciation and amortization	51,234	48,737	50,587
Impairment of intangible assets			3,350
Gain on disposition of long-lived assets		(1,076)us-gaap_GainLossOnDispositionOfAssets	(11,605)us-gaap_GainLossOnDispositionOfAssets
Total operating expenses	250,771us-gaap_OperatingExpenses	228,750us-gaap_OperatingExpenses	221,158us-gaap_OperatingExpenses
Income from operations	85,576us-gaap_OperatingIncomeLoss	64,085us-gaap_OperatingIncomeLoss	56,638us-gaap_OperatingIncomeLoss
OTHER INCOME (EXPENSE)
Interest expense, net	(420)us-gaap_InterestIncomeExpenseNet	(11,933)us-gaap_InterestIncomeExpenseNet	(13,709)us-gaap_InterestIncomeExpenseNet
Loss on interest rate derivative contracts		(5,408)us-gaap_UnrealizedGainLossOnDerivatives
Other income (expense), net	1,012us-gaap_OtherNonoperatingIncomeExpense	(271)us-gaap_OtherNonoperatingIncomeExpense	1,867us-gaap_OtherNonoperatingIncomeExpense
Other income (expense), net	592us-gaap_NonoperatingIncomeExpense	(17,612)us-gaap_NonoperatingIncomeExpense	(11,842)us-gaap_NonoperatingIncomeExpense
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	86,168	46,473	44,796
Income taxes	28,148us-gaap_IncomeTaxExpenseBenefit	9,536us-gaap_IncomeTaxExpenseBenefit	20,831us-gaap_IncomeTaxExpenseBenefit
INCOME FROM CONTINUING OPERATIONS	58,020	36,937	23,965
Income from discontinued operations, net of tax		5,166	29,202
Gain on sale of discontinued operations, net of tax	1,102	307,102
Income from discontinued operations, net of tax	1,102	312,268	29,202
NET INCOME	59,122us-gaap_ProfitLoss	349,205us-gaap_ProfitLoss	53,167us-gaap_ProfitLoss
Net income attributable to non-controlling interests, net of tax:
Continuing operations	(10,970)	(7,989)	(3,145)
Discontinued operations		(601)	(1,090)
Disposal gain on sale of discontinued operations		(28,899)
Net income attributable to non-controlling interests, net of tax	(10,970)	(37,489)	(4,235)
NET INCOME ATTRIBUTABLE TO ATLANTIC TELE-NETWORK, INC. STOCKHOLDERS	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)	$ 2.96	$ 1.84	$ 1.34
Discontinued operations:
Discontinued operations (in dollars per share)		$ 0.29	$ 1.81
Gain on sale of discontinued operations (in dollars per share)	$ 0.07	$ 17.72
Total discontinued operations (in dollars per share)	$ 0.07	$ 18.01	$ 1.81
Total (in dollars per share)	$ 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)	$ 2.94	$ 1.83	$ 1.33
Discontinued operations:
Discontinued operations (in dollars per share)		$ 0.29	$ 1.80
Gain on sale of discontinued operations (in dollars per share)	$ 0.07	$ 17.59
Total discontinued operations (in dollars per share)	$ 0.07	$ 17.88	$ 1.80
Total (in dollars per share)	$ 3.01us-gaap_EarningsPerShareDiluted	$ 19.71us-gaap_EarningsPerShareDiluted	$ 3.13us-gaap_EarningsPerShareDiluted
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING:
Basic (in shares)	15,898	15,704	15,531
Diluted (in shares)	16,013	15,817	15,619
DIVIDENDS PER SHARE APPLICABLE TO COMMON STOCK (in dollars per share)	$ 1.12	$ 1.04	$ 0.96
U.S. Wireless
REVENUE:
Total revenue	153,040	107,930	102,817
International wireless
REVENUE:
Total revenue	88,650	91,432	81,463
Wireline
REVENUE:
Total revenue	85,284	84,585	85,524
Equipment and other
REVENUE:
Total revenue	$ 9,373	$ 8,888	$ 7,992

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This element represents the overall income (loss) from a disposal group that is classified as a component of the entity, net of income tax, reported as a separate component of income before extraordinary items, which is apportioned to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This item includes the following (net of tax): income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

+ References

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Per basic share amount, after tax, of income (loss) from the day-to-day business activities of the discontinued operation and gain (loss) from the disposal of the discontinued operation.

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-Number 210

-Section 04

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-Article 9

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Per diluted share amount, after tax, of income (loss) from the day-to-day business activities of the discontinued operation and gain (loss) from the disposal of the discontinued operation.

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- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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- Definition

The net amount of operating interest income (expense).

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-SubTopic 225

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- Definition

Amount of Net Income (Loss) attributable to noncontrolling interest.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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- Definition

The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business).

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-Publisher FASB

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-Name Regulation S-X (SX)

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-Paragraph 7

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- Definition

Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense.

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No definition available.

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- Definition

The net result for the period of deducting operating expenses from operating revenues.

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No definition available.

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The net amount of other income and expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income (expense) recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) net gains or losses on securities, (d) unusual costs, (e) gains or losses on foreign exchange transactions, and (f) miscellaneous other income and expense items.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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-Paragraph 4J

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

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-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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- Definition

The aggregate total amount of expenses directly related to the marketing or selling of products or services.

+ References

No definition available.

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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