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COMMITMENTS AND CONTINGENCIES - Narrative (Details) AWG in Millions, $ in Millions | 1 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 30, 2007 USD ($) | Sep. 30, 2016 AWG | Sep. 30, 2016 USD ($) | Dec. 31, 2011 USD ($)
Commitments and contingencies |  |  |  |
Renewal fee of telecommunications license |  | AWG 7.2 | $ 4.0 |
Contingency related to spectrum fees |  |  |  |
Commitments and contingencies |  |  |  |
Spectrum fees paid |  |  |  | $ 2.6
Letter of credit sub-facility |  |  |  |
Commitments and contingencies |  |  |  |
Outstanding letters of credit |  |  | $ 10.6 |
Universal Service Administrative Company |  |  |  |
Commitments and contingencies |  |  |  |
Commitment fee (as a percent) |  | 1.75% | 1.75% |
Lawsuit filed by CTL |  |  |  |
Commitments and contingencies |  |  |  |
Damages asserted | $ 200.0 |  |  |
Litigation proceedings and disputes in Guyana |  |  |  |
Commitments and contingencies |  |  |  |
Period for which litigation proceedings and other disputes have not been the subject of discussions or other significant activity |  | 5 years | 5 years |
Lawsuit filed by GT&T against Digicel |  |  |  |
Commitments and contingencies |  |  |  |
Damages asserted |  |  | $ 9.0 |
Punitive damages |  |  | 5.0 |
Legal claims regarding tax filings with the Guyana Revenue Authority |  |  |  |
Commitments and contingencies |  |  |  |
Future payments related to disputed tax assessments |  |  | 44.1 |
Accrued contingent liability |  |  | $ 5.0 |
Legal claims regarding tax filings with the Guyana Revenue Authority | Minimum |  |  |  |
Commitments and contingencies |  |  |  |
Percentage of return on investment ensured by the government of Guyana |  | 15.00% | 15.00% |

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