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ACQUISITIONS AND DISPOSITIONS - Pro Forma Results (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended
--- | --- | --- | ---
Jul. 01, 2016 | May 03, 2016 | Mar. 31, 2016
Pro Forma |  |  |
Revenue |  |  | $ 135,859
Net income (loss) attributable to ATN International, Inc. Stockholders |  |  | $ 6,061
Earnings per share: Basic (in dollars per share) |  |  | $ 0.38
Earnings per share: Diluted (in dollars per share) |  |  | $ 0.37
As reported |  |  |
Pro Forma |  |  |
Revenue |  |  | $ 89,686
Net income (loss) attributable to ATN International, Inc. Stockholders |  |  | $ 6,120
Earnings per share: Basic (in dollars per share) |  |  | $ 0.38
Earnings per share: Diluted (in dollars per share) |  |  | $ 0.38
One Communications (formerly KeyTech) |  |  |
Business Acquisition [Line Items] |  |  |
Retirement of debt |  | $ 24,700 |
Viya (formerly Innovative) |  |  |
Business Acquisition [Line Items] |  |  |
Retirement of debt | $ 185,800 |  |
Viya (formerly Innovative) | Term loans |  |  |
Business Acquisition [Line Items] |  |  |
Debt Instrument, Face Amount | $ 60,000 |  |
One Communications (formerly KeyTech) |  |  |
Business Acquisition [Line Items] |  |  |
Impairment charges |  |  | $ 4,300

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