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Equity - Summary of Capital Stock (Detail) - shares
shares in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of classes of share capital [line items]      
Capital stock (in shares) 16,806,657 16,806,657 16,806,658
A      
Disclosure of classes of share capital [line items]      
Capital stock (in shares) 7,936,628 7,936,628 7,936,628
B      
Disclosure of classes of share capital [line items]      
Capital stock (in shares) 1,575,624 1,575,624 1,575,624
D      
Disclosure of classes of share capital [line items]      
Capital stock (in shares) 4,668,365 4,668,365 4,668,366
Series L shares, without par value      
Disclosure of classes of share capital [line items]      
Capital stock (in shares) 2,626,040 2,626,040 2,626,040