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Income from operations - Employees per geographical location (Detail)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income from operations [Line Items]      
Average number of employees 80,531 78,392 74,888
Country of domicile [member] | Continuing operations [member]      
Income from operations [Line Items]      
Average number of employees 11,585 11,679 11,427
Foreign countries [member] | Continuing operations [member]      
Income from operations [Line Items]      
Average number of employees 68,946 66,713 63,460