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Equity - Summary of Class A Common Shares and Class B Subordinate Voting Shares Issued and Outstanding (Detail)
shares in Thousands, pure in Thousands
 12 Months Ended
Dec. 31, 2018
shares
Dec. 31, 2017
shares
Disclosure of classes of share capital [line items]    
Options exercised (c) 3,710 2,275
Class A Common Shares [member]    
Disclosure of classes of share capital [line items]    
Beginning balance 7,777 9,353
Class A shares conversion (9) (1,576)
Ending balance 7,768 7,777
Class B Subordinate Voting Shares [member]    
Disclosure of classes of share capital [line items]    
Beginning balance 565,506 567,546
Class A shares conversion 9 1,576
Options exercised (c) 3,710 2,275
Acquired and cancelled pursuant to normal course issuer bid (h) (6,300) (5,891)
Ending balance 562,925 565,506