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Income from operations - Employees per geographical location (Detail)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income from operations - Text Details (Detail) [Line Items]      
Average number of employees 74,888 115,392 113,572
Continuing operations [member]      
Income from operations - Text Details (Detail) [Line Items]      
Average number of employees 74,888 71,895 69,602
Continuing operations [member] | Country of domicile [member]      
Income from operations - Text Details (Detail) [Line Items]      
Average number of employees 11,427 11,308 11,199
Continuing operations [member] | Foreign countries [member]      
Income from operations - Text Details (Detail) [Line Items]      
Average number of employees 63,460 60,587 58,403
Discontinued operations [member]      
Income from operations - Text Details (Detail) [Line Items]      
Average number of employees   43,497 43,971