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Capital Stock - Schedule of Changes in Number of Common Shares Outstanding (Detail) - shares | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020
Class Of Stock [Line Items] |  |
Beginning balance | 246,348,092 | 249,630,803
Restricted stock grants | 1,286,737 | 3,390,358
Treasury shares | 1,112 | (8,197,662)
Ending balance | 249,773,811 | 246,348,092
Restricted Stock |  |
Class Of Stock [Line Items] |  |
Restricted stock units vested | 1,483,436 | 1,226,473
Performance Share |  |
Class Of Stock [Line Items] |  |
Performance stock units issued | 640,468 | 279,420
Performance stock dividends | 13,966 | 18,700

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