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ACCOUNTS RECEIVABLE (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
ACCOUNTS RECEIVABLE
Accounts receivable	$ 64,217us-gaap_AccountsReceivableGrossCurrent	$ 47,426us-gaap_AccountsReceivableGrossCurrent
Less: allowance for doubtful accounts	(11,344)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent	(9,746)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Total accounts receivable, net	52,873us-gaap_AccountsReceivableNetCurrent	37,680us-gaap_AccountsReceivableNetCurrent
U.S. wireless, Retail
ACCOUNTS RECEIVABLE
Accounts receivable	21,367us-gaap_AccountsReceivableGrossCurrent / us-gaap_ProductOrServiceAxis = atni_USWirelessRetailMember	19,833us-gaap_AccountsReceivableGrossCurrent / us-gaap_ProductOrServiceAxis = atni_USWirelessRetailMember
U.S. wireless, Wholesale
ACCOUNTS RECEIVABLE
Accounts receivable	41,245us-gaap_AccountsReceivableGrossCurrent / us-gaap_ProductOrServiceAxis = atni_USWirelessWholesaleMember	27,539us-gaap_AccountsReceivableGrossCurrent / us-gaap_ProductOrServiceAxis = atni_USWirelessWholesaleMember
Other
ACCOUNTS RECEIVABLE
Accounts receivable	$ 1,605us-gaap_AccountsReceivableGrossCurrent / us-gaap_ProductOrServiceAxis = atni_OtherAccountsReceivableMember	$ 54us-gaap_AccountsReceivableGrossCurrent / us-gaap_ProductOrServiceAxis = atni_OtherAccountsReceivableMember

X

- Definition

Amounts due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer) for goods or services (including trade receivables) that have been delivered or sold in the normal course of business.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.3)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 3

-Subparagraph a, b

-Article 5

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- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.3-4)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

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-Article 5



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

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- Definition

A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 4

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.4)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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