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Equity - Summary of Class A Common Shares and Class B Subordinate Voting Shares Issued and Outstanding (Detail) shares in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 shares | Dec. 31, 2019 shares
Disclosure of classes of share capital [line items] |  |
Beginning balance (in shares) | 547,300 |
Options exercised (in shares) | 156 | 1,239
Ending balance (in shares) | 531,100 | 547,300
Class A Common Shares |  |
Disclosure of classes of share capital [line items] |  |
Beginning balance (in shares) | 7,765 | 7,768
Class A common shares conversion (in shares) |  | (3)
Options exercised (in shares) | 0 | 0
Acquired and cancelled pursuant to normal course issuer bid (in shares) | 0 | 0
Ending balance (in shares) | 7,765 | 7,765
Class B Subordinate Voting Shares |  |
Disclosure of classes of share capital [line items] |  |
Beginning balance (in shares) | 539,528 | 562,925
Class A common shares conversion (in shares) |  | 3
Options exercised (in shares) | 145 | 1,239
Acquired and cancelled pursuant to normal course issuer bid (in shares) | (16,292) | (24,639)
Ending balance (in shares) | 523,381 | 539,528

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