Document and Entity Information	12 Months Ended
	Dec. 31, 2017 shares
Document and Entity Information [Abstract]
Entity Registrant Name	GRUPO TMM SAB
Entity Central Index Key	0001163560
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	No
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding	102,182,841
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	FY
Document Type	20-F
Amendment Flag	false
Document Period End Date	Dec. 31, 2017