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Financial instruments risk (Tables)
 12 Months Ended
Dec. 31, 2017
Financial instruments risk [Abstract]  
Monetary assets and liabilities denominated in foreign currencies
At December 31, 2016 and 2015, the Company held monetary assets and liabilities denominated in foreign currencies other than the Mexican peso, translated at the corresponding interbank exchange rate as related to the Mexican peso, as follows:
 
  
2017
  
2016
 
  
US $
  
Other
currencies
  
US $
  
Other
currencies
 
Assets
 
$
548,919
  
$
1,120
  
$
1,217,594
  
$
1,728
 
Liabilities
  
(828,367
)
  
(134,547
)
  
(1,177,029
)
  
(151,080
)
  
$
(279,448
) 
$
(133,427
)
 
$
40,565
  
$
(149,352
)
Disclosure of nature and extent of risks arising from financial instruments [line items]  
Unimpaired accounts receivable
Some of the unimpaired accounts receivable are in arrears on the reporting date, as shown as follows:
 
  
2017
  
2016
 
Up to 3 months
 
$
3,569
  
$
2,462
 
Up to 4 months
  
7,643
   
23,302
 
More than 4 months
  
47,898
   
378,392
 
  
$
59,110
  
$
404,156
 
Contractual maturities of financial liabilities
At December 31, 2017 and 2016, the financial liabilities of Grupo TMM have contractual maturities (including interest payments as applicable) are summarized as follows:
 
  
Current
  
Non-Current
 
  
In 6 months
  
6 to 12
months
  
1 to 4 years
  
More than 4
years
 
At December 31, 2017
            
Trade payables
 
$
-
  
$
169,072
  
$
-
  
$
-
 
Accounts payable and accrued expenses
  
-
   
366,918
   
-
   
-
 
Financial debt
  
333,814
   
168,547
   
396,257
   
-
 
  
$
333,814
  
$
704,537
  
$
396,257
  
$
-
 
                 
At December 31, 2016
                
Trade payables
 
$
-
  
$
189,576
  
$
-
  
$
-
 
Accounts payable and accrued expenses
  
-
   
405,505
   
-
   
-
 
Financial debt
  
685,231
   
55,139
   
494,664
   
8,835,123
 
  
$
685,231
  
$
650,220
  
$
494,664
  
$
8,835,123
 
Currency Risk [Member]  
Disclosure of nature and extent of risks arising from financial instruments [line items]  
Sensitivity analysis
If the peso had strengthened or weakened against the USD by 4.73% for 2017 and 19.70% for 2016, this would have had the following impact on the monetary position:
 
  
2017
  
2016
 
  
4.73%
Increase in
the
exchange rate
  
4.73%
decrease in
the
exchange rate
  
19.70%
Increase in
the
exchange rate
  
19.70%
decrease in
the
exchange rate
 
Assets in US dollars
 
$
25,989
  
$
(25,989
)
 
$
239,821
  
$
(239,821
)
Assets in other currencies
  
53
   
(53
)
  
340
   
(340
)
Liabilities in US dollars
  
(39,219
)
  
39,219
   
(231,831
)
  
231,831
 
Liabilities in other currencies
  
(6,370
)
  
6,370
   
(29,757
)
  
29,757
 
  
$
(19,547
)
 
$
19,547
  
$
(21,427
)
 
$
(21,427
)
Interest Rate Risks [Member]  
Disclosure of nature and extent of risks arising from financial instruments [line items]  
Sensitivity analysis
The following table illustrates the sensitivity in operations at December 31, 2017 and 2016 to a reasonably possible change in the interest rates of +/- 1%. These changes are considered to be reasonably possible based on the current market conditions. The calculations are based on a variance in the average market interest rate for each period and the financial instruments on the reporting date that are sensitive to variances in the interest rates. The rest of the variables remain constant.
 
  
2017
  
2016
 
  
+1%
Variance
  
-1%
Variance
  
+1%
Variance
  
-1%
Variance
 
Profit or loss for the year
 
$
(2,048
)
 
$
2,048
  
$
(2,262
)
 
$
2,262