COMMITMENTS AND CONTINGENCIES (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended
Jul. 31, 2014	Jan. 15, 2014
COMMITMENTS AND CONTINGENCIES
Renewal fee of telecommunications license		$ 4.0
Amount of overdue spectrum fees demanded by the government of Aruba be paid by July 31, 2014	$ 2.0

Represents the amount of overdue spectrum fees demanded by the government of Aruba be paid by a specified date.

No definition available.

Name:	atni_LossContingencyOverdueSpectrumFeesDemandedWithinSpecificDate
Namespace Prefix:	atni_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration