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MOBILITY FUND GRANTS (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |  | 1 Months Ended | 0 Months Ended | 1 Months Ended | 12 Months Ended
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Dec. 31, 2013 item | Jun. 30, 2013 Letters of credit | Aug. 31, 2013 Alltel Mobility Funds | Nov. 14, 2013 Alltel Mobility Funds Letters of credit | Sep. 20, 2013 Alltel Mobility Funds Letters of credit | Aug. 31, 2013 Wholesale Mobility Funds | Dec. 31, 2013 Wholesale Mobility Funds U.S. Wireless | Dec. 31, 2013 Wholesale Mobility Funds U.S. Wireless Other current liabilities | Dec. 31, 2013 Wholesale Mobility Funds U.S. Wireless Other long-term liabilities
MOBILITY FUND GRANTS |  |  |  |  |  |  |  |  |
Number of new funds created by FCC | 2 |  |  |  |  |  |  |  |
Mobility Funds approved by FCC |  |  | $ 47.0 |  |  | $ 21.7 |  |  |
Letters of credit posted to USAC |  | 29.8 |  |  |  |  |  |  |
Period over which a portion of the Mobility Funds is used to offset the costs of supporting the networks | 5 years |  |  |  |  |  |  |  |
Cash payment of penalty fees for default |  |  |  |  | 4.6 |  |  |  |
Amount terminated |  |  |  | 19.9 |  |  |  |  |
Mobility Funds received |  |  |  |  |  |  | 7.3 | 2.4 | 3.8
Grant funds used to offset fixed asset related costs | $ 1.1 |  |  |  |  |  | $ 1.1 |  |

X
- Definition Represents the amount of grants received for the construction of assets which are recognized as a reduction of the cost of fixed assets, a reduction of depreciation expense over the useful lives of the assets, and as a reduction of capital expenditures. + References No definition available. + Details
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- Details
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Namespace Prefix: | atni_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition Represents the amount of Mobility Fund support approved by Federal Communications Commission (FCC). + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Mobility Funds received to offset construction costs and future operations expenses. + References No definition available. + Details
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Balance Type: | credit
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- Definition Represents the number of new funds created by Federal Communications Commission (FCC). + References No definition available. + Details
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Namespace Prefix: | atni_
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- Definition Represents the amount of cash payment of penalty fees for default. + References No definition available. + Details
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- Definition Represents the period over which a portion of the Mobility Funds is used to offset the costs of supporting the networks. + References No definition available. + Details
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- Definition Gross amount of debt extinguished. + References No definition available. + Details
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Balance Type: | debit
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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