XML 77 R63.htm IDEA: XBRL DOCUMENT v3.21.1
Nature of operations, Principal activity (Details)
$ in Millions
1 Months Ended 12 Months Ended
Feb. 28, 2019
USD ($)
Dec. 31, 2020
Ship
Feb. 14, 2019
Expansion and improvement of maritime operations [Abstract]      
Increase in minimum capacity of repair services of ships per year | Ship   30  
Expansion of port and terminal operations [Abstract]      
States of Central Mexico and Mexico City, Percentage of Gross Domestic Product of Mexico   50.00%  
Percentage of minimum gasoline and diesel domestic consumption   70.00%  
Percentage of voting equity interests acquired     50.00%
Sierra Oil & Gas [Member]      
Expansion of port and terminal operations [Abstract]      
Percentage of voting equity interests acquired 50.00%    
Consideration paid | $ $ 2.6    
Percentage of ownership 100.00%