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Preparation of the consolidated financial statements and significant accounting policies (Details 1) (Detail)
12 Months Ended
Dec. 31, 2018
Data processing equipment  
Property and equipment  
Years 2.5 to 5
Furniture and fittings  
Property and equipment  
Years 10
Facilities  
Property and equipment  
Years 10
Building improvements [member]  
Property and equipment  
Years 10
Machinery and equipment  
Property and equipment  
Years 5 to 10
Vehicles  
Property and equipment  
Years 5