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Intangible assets (Tables)
 12 Months Ended
Dec. 31, 2017
Intangible assets [Abstract]  
Summary of intangible assets
Intangible assets at December 31, 2017 and 2016 are summarized as follows:
 
  
2017
 
  
Net balances
at year start
  
Additions
(Disposals)
  
Transfers
and others
  
Amortization
  
Net balances
at year end
 
Estimated
useful life
(years)
 
Software
 
$
8,114
  
$
-
  
$
(4,079
)
 
$
1,673
  
$
2,362
 
3 and 5
 
Trademark (a)
  
125,528
   
-
   
-
   
-
   
125,528
 
Indefinite
 
  
$
133,642
  
$
-
  
$
(4,079
)
 
$
1,673
  
$
127,890
   

  
2016
 
  
Net balances
at year start
  
Additions
(Disposals)
  
Transfers
and others
  
Amortization
  
Net balances
at year end
 
Estimated
useful life
(years)
 
Software
 
$
10,610
  
$
-
  
$
3,320
  
$
5,816
  
$
8,114
 
3 and 5
 
Trademark (a)
  
125,528
   
-
   
-
   
-
   
125,528
 
Indefinite
 
  
$
136,138
  
$
-
  
$
3,320
  
$
5,816
  
$
133,642
   
 
(a)
Corresponds to the rights on the Marmex trademark associated with the specialized maritime division segment, specifically the offshore vessels operation. This trademark is subject to annual impairment testing.