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Concession rights (Tables)
 12 Months Ended
Dec. 31, 2017
Concession rights [Abstract]  
Summary of concession rights
The concession rights at December 31, 2017 and 2016 are summarized as follows:
 
  
2017
  
2016
  
Years to
amortize
 
Administración Portuaria Integral de Acapulco (a)
 
$
94,607
  
$
94,607
   
10
 
Transportación Marítima Mexicana (b)
  
30,266
   
30,266
   
-
 
   
124,873
   
124,873
     
Accumulated amortization
  
(111,629
)
  
(107,844
)
    
Concession rights, net
 
$
13,244
  
$
17,029
     
 
The amortization of the concession rights was $3,785 for the years ended December 31, 2017 and 2016.
 
 (a)
Concession expires June 2021.
 
 (b)
Renewal expires January 16, 2023, with the possibility of renewing for another 8 years. In January 2007, the total value of this concession was amortized prior to the renewal. Accumulated amortization for this intangible asset is $30,266.