General information and statement of compliance with IFRS (Details) - Contract	3 Months Ended	12 Months Ended
Sep. 30, 2024	Dec. 31, 2023
Maritime Infrastructure Operations [Abstract]
Number of current mud vessels contracts		5
Maximum [Member] \| Offshore Vessels [Member] \| Gulf of Mexico [Member] \| Subsequent Event [Member]
Maritime Infrastructure Operations [Abstract]
Percentage of potential offshore vessels	94.00%

Percentage of potential offshore vessels to operate in the gulf of Mexico.

No definition available.

Name:	gtmay_PercentageOfPotentialOffshoreVessels
Namespace Prefix:	gtmay_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration