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DETAIL OF SIGNIFICANT STATEMENT OF FINANCIAL POSITION AND STATEMENT OF COMPREHENSIVE INCOME CAPTIONS, Payroll and Social Security Taxes Payable (Details) - ARS ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Current [Abstract] |  |
Vacation benefit payable | $ 104,739 | $ 82,476
Annual bonus payable | 84,895 | 50,788
Social security taxes payable | 45,573 | 35,595
Total | 235,207 | 168,859
Non-current [Abstract] |  |
Vacation benefit payable | 0 | 0
Annual bonus payable | 0 | 0
Social security taxes payable | 0 | 0
Total | $ 0 | $ 0

X
- Definition The amount of current annual bonus payable. + References No definition available. + Details
Name: | tgs_AnnualBonusPayableCurrent
Namespace Prefix: | tgs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of non-current annual bonus payable. + References No definition available. + Details
Name: | tgs_AnnualBonusPayableNoncurrent
Namespace Prefix: | tgs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | tgs_CurrentPayrollAndSocialSecurityTaxesPayableAbstract
Namespace Prefix: | tgs_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | tgs_NoncurrentPayrollAndSocialSecurityTaxesPayableAbstract
Namespace Prefix: | tgs_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of current payroll and social security taxes payable. + References No definition available. + Details
Name: | tgs_PayrollAndSocialSecurityTaxesPayableCurrent
Namespace Prefix: | tgs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of non-current payroll and social security taxes payable. + References No definition available. + Details
Name: | tgs_PayrollAndSocialSecurityTaxesPayableNonCurrent
Namespace Prefix: | tgs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of current social security taxes payable. + References No definition available. + Details
Name: | tgs_SocialSecurityTaxesPayableCurrent
Namespace Prefix: | tgs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of non-current social security taxes payable. + References No definition available. + Details
Name: | tgs_SocialSecurityTaxesPayableNoncurrent
Namespace Prefix: | tgs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of current vacation benefit payable. + References No definition available. + Details
Name: | tgs_VacationBenefitPayableCurrent
Namespace Prefix: | tgs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of non-current vacation benefit payable. + References No definition available. + Details
Name: | tgs_VacationBenefitPayableNonCurrent
Namespace Prefix: | tgs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant