General information and statement of compliance with IFRS (Details)	3 Months Ended
Dec. 31, 2022 Vessel
Maximum [Member] \| Offshore Vessels [Member] \| Gulf of Mexico [Member]
Maritime Infrastructure Operations [Abstract]
Number of potential offshore vessels	945

The number of potential offshore vessels to operate in the gulf of Mexico.

No definition available.

Name:	gtmay_NumberOfPotentialOffshoreVessels
Namespace Prefix:	gtmay_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration