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DERIVATIVES (Schedule of Fair Value of Derivative Instruments) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Derivative assets:    
Intangible and other assets, net $ 46us-gaap_DerivativeAssets $ 185us-gaap_DerivativeAssets
Derivative liabilities:    
Derivative liabilities, current 0us-gaap_DerivativeLiabilitiesCurrent (57,048)us-gaap_DerivativeLiabilitiesCurrent
Derivative liabilities, non-current (441,550)us-gaap_DerivativeLiabilitiesNoncurrent (405,478)us-gaap_DerivativeLiabilitiesNoncurrent
Derivative Liabilities: (441,550)us-gaap_DerivativeLiabilities (462,526)us-gaap_DerivativeLiabilities
Interest rate cap    
Derivative assets:    
Intangible and other assets, net 46us-gaap_DerivativeAssets
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateCapMember
185us-gaap_DerivativeAssets
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateCapMember
Warrants issued with 8.00% Notes Issued in 2009    
Derivative liabilities:    
Derivative liabilities, current 0us-gaap_DerivativeLiabilitiesCurrent
/ us-gaap_DerivativeInstrumentRiskAxis
= gsat_WarrantsIssuedWithEightPointZeroPercentNotesMember
(57,048)us-gaap_DerivativeLiabilitiesCurrent
/ us-gaap_DerivativeInstrumentRiskAxis
= gsat_WarrantsIssuedWithEightPointZeroPercentNotesMember
Compound embedded derivative with 8.00% Notes Issued in 2009    
Derivative liabilities:    
Derivative liabilities, non-current 0us-gaap_DerivativeLiabilitiesNoncurrent
/ us-gaap_DerivativeInstrumentRiskAxis
= gsat_CompoundEmbeddedConversionOptionWithEightPointZeroPercentNotesMember
(66,022)us-gaap_DerivativeLiabilitiesNoncurrent
/ us-gaap_DerivativeInstrumentRiskAxis
= gsat_CompoundEmbeddedConversionOptionWithEightPointZeroPercentNotesMember
Compound embedded derivative with 8.00% Notes Issued in 2013    
Derivative liabilities:    
Derivative liabilities, non-current (79,040)us-gaap_DerivativeLiabilitiesNoncurrent
/ us-gaap_DerivativeInstrumentRiskAxis
= gsat_CompoundEmbeddedConversionOptionWithEightPointZeroPercentNotesIssuedInTwentyThirteenMember
(109,794)us-gaap_DerivativeLiabilitiesNoncurrent
/ us-gaap_DerivativeInstrumentRiskAxis
= gsat_CompoundEmbeddedConversionOptionWithEightPointZeroPercentNotesIssuedInTwentyThirteenMember
Compound embedded derivative with the Amended and Restated Thermo Loan Agreement    
Derivative liabilities:    
Derivative liabilities, non-current $ (362,510)us-gaap_DerivativeLiabilitiesNoncurrent
/ us-gaap_DerivativeInstrumentRiskAxis
= gsat_CompoundEmbeddedDerivativeWithThermoLoanAgreementMember
$ (229,662)us-gaap_DerivativeLiabilitiesNoncurrent
/ us-gaap_DerivativeInstrumentRiskAxis
= gsat_CompoundEmbeddedDerivativeWithThermoLoanAgreementMember