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ACQUISITIONS - Purchase Price Allocation (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |
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Jul. 01, 2016 | May 03, 2016 | Apr. 07, 2016 | Jul. 31, 2016 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2016 | Jun. 30, 2016 | Dec. 31, 2015
Consideration Transferred |  |  |  |  |  |  |  |  |  |  |
Total consideration |  | $ 41,563 |  |  |  |  |  |  |  |  |
Total value to allocate |  |  |  |  |  |  |  |  |  |  |
Total consideration |  | 41,563 |  |  |  |  |  |  |  |  |
Business Combination Total Value Allocation |  | 74,472 |  |  |  |  |  |  |  |  |
Preliminary purchase price allocation: |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 62,042 |  | $ 62,042 |  |  |  | $ 45,077
Gain on KeyTech bargain purchase |  |  |  |  |  |  | $ 7,304 |  |  |  |
Purchase price allocation BDC: |  |  |  |  |  |  |  |  |  |  |
Discount rate (as a percent) |  |  |  |  |  |  | 14.00% |  |  |  |
Revenue |  |  |  |  | 138,795 | $ 96,782 | $ 328,471 | $ 272,453 |  |  |
Income (Loss) from Continuing Operations before Income Taxes |  |  |  |  | 21,296 | 21,782 | 37,784 | 48,439 |  |  |
CellOne [Member] |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation BDC: |  |  |  |  |  |  |  |  |  |  |
Acquired carrying value of BDC non-controlling interest acquired |  | 2,940 |  |  |  |  |  |  |  |  |
Excess of purchase price paid over carrying value of non-controlling interest acquired |  | 4,105 |  |  |  |  |  |  |  |  |
Bermuda wireless operations |  |  |  |  |  |  |  |  |  |  |
Consideration Transferred |  |  |  |  |  |  |  |  |  |  |
Total consideration |  | 7,045 |  |  |  |  |  |  |  |  |
Total value to allocate |  |  |  |  |  |  |  |  |  |  |
Total consideration |  | 7,045 |  |  |  |  |  |  |  |  |
Business Combination Total Value Allocation |  | 7,045 |  |  |  |  |  |  |  |  |
Vibrant Energy |  |  |  |  |  |  |  |  |  |  |
Consideration Transferred |  |  |  |  |  |  |  |  |  |  |
Total consideration |  |  | $ 6,193 |  |  |  |  |  |  |  |
Total value to allocate |  |  |  |  |  |  |  |  |  |  |
Total consideration |  |  | 6,193 |  |  |  |  |  |  |  |
Preliminary purchase price allocation: |  |  |  |  |  |  |  |  |  |  |
Cash |  |  | 136 |  |  |  |  |  |  |  |
Property, plant and equipment |  |  | 7,321 |  |  |  |  |  |  |  |
Goodwill |  |  | 3,279 |  |  |  |  |  |  |  |
Accounts payable and accrued liabilities |  |  | (5,179) |  |  |  |  |  |  |  |
Net assets acquired |  |  | 6,193 |  |  |  |  |  |  |  |
Prepayments and other assets |  |  | $ 636 |  |  |  |  |  |  |  |
Purchase price allocation BDC: |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  | 300 |  |  |  |
Keytech |  |  |  |  |  |  |  |  |  |  |
Consideration Transferred |  |  |  |  |  |  |  |  |  |  |
Total consideration |  | 34,518 |  |  |  |  |  |  |  |  |
Non-controlling interests |  | 32,909 |  |  |  |  |  |  |  |  |
Total value to allocate |  |  |  |  |  |  |  |  |  |  |
Total consideration |  | 34,518 |  |  |  |  |  |  |  |  |
Business Combination Total Value Allocation |  | 67,427 |  |  |  |  |  |  |  |  |
Preliminary purchase price allocation: |  |  |  |  |  |  |  |  |  |  |
Cash |  | 8,185 |  |  |  |  |  |  |  |  |
Accounts receivable |  | 6,451 |  |  |  |  |  |  |  |  |
Other current assets |  | 3,241 |  |  |  |  |  |  |  |  |
Property, plant and equipment |  | 100,892 |  |  |  |  |  |  |  |  |
Intangible assets |  | 10,590 |  |  |  |  |  |  |  |  |
Other Assets |  | 3,464 |  |  |  |  |  |  |  |  |
Accounts payable and accrued liabilities |  | (16,051) |  |  |  |  |  |  |  |  |
Advance payments and deposits |  | (6,683) |  |  |  |  |  |  |  |  |
Net assets acquired |  | 74,731 |  |  |  |  |  |  |  |  |
Gain on KeyTech bargain purchase |  | 7,304 |  |  |  |  |  |  |  |  |
Current debt |  | (6,429) |  |  |  |  |  |  |  |  |
Long-term debt |  | (28,929) |  |  |  |  |  |  |  |  |
Non-controlling interests |  | 32,909 |  |  |  |  |  |  |  |  |
Purchase price allocation BDC: |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  | 34,700 |  |  |  |
Income (Loss) from Continuing Operations before Income Taxes |  |  |  |  |  |  | 1,900 |  |  |  |
External acquisition related charges relating to legal, accounting and consulting services. |  | $ 4,300 |  |  | 3,300 |  | 3,300 |  |  |  |
Innovative |  |  |  |  |  |  |  |  |  |  |
Consideration Transferred |  |  |  |  |  |  |  |  |  |  |
Total consideration | $ 112,301 |  |  |  |  |  |  |  |  |  |
Cash-on-hand used to fund the purchase price | 50,900 |  |  |  |  |  |  |  |  |  |
Working capital adjustments |  |  |  |  |  |  | 4,900 |  |  |  |
Purchase price | 145,000 |  |  |  |  |  | 1,400 |  |  |  |
Purchase price adjustments | 4,900 |  |  |  |  |  |  |  |  |  |
Total value to allocate |  |  |  |  |  |  |  |  |  |  |
Total consideration | 112,301 |  |  |  |  |  |  |  |  |  |
Non-controlling interests | 221 |  |  |  |  |  |  |  |  |  |
Business Combination Total Value Allocation | 112,522 |  |  |  |  |  |  |  |  |  |
Preliminary purchase price allocation: |  |  |  |  |  |  |  |  |  |  |
Cash | 4,229 |  |  |  |  |  |  |  |  |  |
Accounts receivable | 6,553 |  |  |  |  |  |  |  |  |  |
Materials & supplies | 6,533 |  |  |  |  |  |  |  |  |  |
Other current assets | 2,286 |  |  |  |  |  |  |  |  |  |
Property, plant and equipment | 108,284 |  |  |  |  |  |  |  |  |  |
Telecommunication licenses | 7,623 |  |  |  |  |  |  |  |  |  |
Goodwill | 20,586 |  |  |  |  |  |  |  |  |  |
Intangible assets | 7,800 |  |  |  |  |  |  |  |  |  |
Other Assets | 4,394 |  |  |  |  |  |  |  |  |  |
Accounts payable and accrued liabilities | (15,889) |  |  |  |  |  |  |  |  |  |
Advance payments and deposits | (7,793) |  |  |  |  |  |  |  |  |  |
Deferred tax liability | (2,935) |  |  |  |  |  |  |  |  |  |
Pension liability | (29,149) |  |  |  |  |  |  |  |  |  |
Net assets acquired | 112,522 |  |  |  |  |  |  |  |  |  |
Purchase price allocation BDC: |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  | 26,500 |  |  |  |
Income (Loss) from Continuing Operations before Income Taxes |  |  |  |  |  |  | 1,400 |  |  |  |
External acquisition related charges relating to legal, accounting and consulting services. | 4,300 |  |  |  | $ 2,400 |  | 2,400 |  |  |  |
Innovative | Defined Benefit Pension Plans |  |  |  |  |  |  |  |  |  |  |
Funded status of plan |  |  |  |  |  |  |  |  |  |  |
Fair value of plan assets |  |  |  |  |  |  |  |  |  | $ 45,117 |
Benefit obligations |  |  |  |  |  |  |  |  |  | 69,178 |
Funded status of plan |  |  |  |  |  |  |  |  |  | (24,061) |
Innovative | Other Post-retirement Benefit Plans |  |  |  |  |  |  |  |  |  |  |
Funded status of plan |  |  |  |  |  |  |  |  |  |  |
Benefit obligations |  |  |  |  |  |  |  |  |  | 5,472 |
Funded status of plan |  |  |  |  |  |  |  |  |  | $ (5,472) |
Innovative | Term loans |  |  |  |  |  |  |  |  |  |  |
Consideration Transferred |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | $ 60,000 |  |  |  |  |  |  |  |  |  |
Telecommunication Equipment |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation BDC: |  |  |  |  |  |  |  |  |  |  |
Discounted rate used for cash flows |  | 15.00% |  |  |  |  |  |  |  |  |
US Telecom |  |  |  |  |  |  |  |  |  |  |
Consideration Transferred |  |  |  |  |  |  |  |  |  |  |
Total consideration |  |  |  | $ 9,100 |  |  |  |  |  |  |
Total value to allocate |  |  |  |  |  |  |  |  |  |  |
Total consideration |  |  |  | 9,100 |  |  |  |  |  |  |
Preliminary purchase price allocation: |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment |  |  |  | 10,200 |  |  |  |  |  |  |
Goodwill |  |  |  | 600 |  |  |  |  |  |  |
Other long term liabilities |  |  |  | $ 1,700 |  |  |  |  |  |  |
As reported |  |  |  |  |  |  |  |  |  |  |
Pro Forma (unaudited) |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  | 96,782 | 328,471 | 272,453 |  |  |
Net income attributable to ATN stockholders |  |  |  |  |  | $ 6,576 | $ 10,206 | $ 12,757 |  |  |
Earnings per shares: |  |  |  |  |  |  |  |  |  |  |
Earnings per share: Basic (in dollars per share) |  |  |  |  |  | $ 0.41 | $ 0.63 | $ 0.79 |  |  |
Earnings per share: Diluted (in dollars per share) |  |  |  |  |  | $ 0.41 | $ 0.63 | $ 0.79 |  |  |
Forecast | Innovative |  |  |  |  |  |  |  |  |  |  |
Consideration Transferred |  |  |  |  |  |  |  |  |  |  |
Cash-on-hand used to fund the purchase price |  |  |  |  |  |  |  |  | $ 27,800 |  |
Minimum | Defined Benefit Pension Plans |  |  |  |  |  |  |  |  |  |  |
Funded status of plan |  |  |  |  |  |  |  |  |  |  |
Discounted rate used for pension benefit obligation |  |  |  |  |  |  | 3.60% |  |  |  |
Minimum | Innovative | Income Approach | Non-Controlling Interests |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation BDC: |  |  |  |  |  |  |  |  |  |  |
Discount rate (as a percent) |  |  |  |  |  |  | 15.00% |  |  |  |
Minimum | Innovative | Income Approach | Cash flow |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation BDC: |  |  |  |  |  |  |  |  |  |  |
Discount rate (as a percent) |  |  |  |  |  |  | 14.00% |  |  |  |
Minimum | Telecommunication Equipment |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation BDC: |  |  |  |  |  |  |  |  |  |  |
Useful life | 1 year | 3 years |  |  |  |  |  |  |  |  |
Minimum | Telecommunication Equipment | Customer relationships |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation BDC: |  |  |  |  |  |  |  |  |  |  |
Useful life | 9 years |  |  |  |  |  |  |  |  |  |
Maximum | Defined Benefit Pension Plans |  |  |  |  |  |  |  |  |  |  |
Funded status of plan |  |  |  |  |  |  |  |  |  |  |
Discounted rate used for pension benefit obligation |  |  |  |  |  |  | 3.90% |  |  |  |
Maximum | Innovative | Income Approach | Non-Controlling Interests |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation BDC: |  |  |  |  |  |  |  |  |  |  |
Discount rate (as a percent) |  |  |  |  |  |  | 25.00% |  |  |  |
Maximum | Innovative | Income Approach | Cash flow |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation BDC: |  |  |  |  |  |  |  |  |  |  |
Discount rate (as a percent) |  |  |  |  |  |  | 25.00% |  |  |  |
Maximum | Telecommunication Equipment |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation BDC: |  |  |  |  |  |  |  |  |  |  |
Useful life | 18 years | 18 years |  |  |  |  |  |  |  |  |
Maximum | Telecommunication Equipment | Customer relationships |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation BDC: |  |  |  |  |  |  |  |  |  |  |
Useful life | 16 years |  |  |  |  |  |  |  |  |  |

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