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SUBSEQUENT EVENT (Details) (USD $)
In Millions, unless otherwise specified
 1 Months Ended 9 Months Ended 12 Months Ended 1 Months Ended 1 Months Ended 0 Months Ended
Nov. 30, 2011
item
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2012
Government of Guyana
Guyana Telephone and Telegraph, Ltd.
Oct. 31, 2012
Letter of credit sub-facility
Amended Credit Facility
Oct. 29, 2012
Letter of credit sub-facility
Amended Credit Facility
Oct. 31, 2012
Subsequent event
Letter of credit sub-facility
Amended Credit Facility
Oct. 29, 2012
Subsequent event
Letter of credit sub-facility
Amended Credit Facility
Oct. 03, 2012
Subsequent event
Scenario forecast
Subsequent event                  
Amount received from Universal Service Fund to support our U.S. wireless business     $ 9.9            
Rate per year at which FCC began phasing out existing USF support (as a percent)   20.00%              
Phase out period of existing USF support as part of FCC's reform program   5 years              
Number of new replacement funds created as part of the USF reform program 2                
Amount provisionally awarded by the FCC as part of new mobility fund                 68.8
Amount provisionally awarded by the FCC as part of new mobility fund for voice network                 68.8
Maximum borrowing capacity           $ 55.0   $ 55.0  
Fee as a percentage on outstanding amount         1.75%   1.75%    
Ownership interest percentage       20.00%