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Equity - Summary of Class A Common Shares and Class B Subordinate Voting Shares Issued and Outstanding (Detail) - shares shares in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Disclosure of classes of share capital [line items] |  |
Beginning balance (in shares) | 570,700 |
Options exercised (in shares) | 1,239 | 3,710
Ending balance (in shares) | 547,300 | 570,700
Class A Common Shares |  |
Disclosure of classes of share capital [line items] |  |
Beginning balance (in shares) | 7,768 | 7,777
Class A common shares conversion (in shares) | (3) | (9)
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 | 7,768
Class B Subordinate Voting Shares |  |
Disclosure of classes of share capital [line items] |  |
Beginning balance (in shares) | 562,925 | 565,506
Class A common shares conversion (in shares) | 3 | 9
Options exercised (in shares) | 1,239 | 3,710
Acquired and cancelled pursuant to normal course issuer bid (in shares) | (24,639) | (6,300)
Ending balance (in shares) | 539,528 | 562,925

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