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Presentation and preparation of the consolidated financial statements and significant accounting policies (Details 1) (Detail)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Data processing equipment    
Property and equipment    
Years 2.5 to 5 2.5 to 5
Furniture and fittings    
Property and equipment    
Years 10 10
Facilities    
Property and equipment    
Years 10 10
Leasehold improvements    
Property and equipment    
Years 10 10
Machinery and equipment    
Property and equipment    
Years 5 to 10 10
Vehicles    
Property and equipment    
Years 5