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Capital Stock - Schedule of Changes in Number of Common Shares Outstanding (Detail) - shares | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Class Of Stock [Line Items] |  |
Beginning balance | 249,630,803 | 249,510,022
Restricted stock grants | 3,390,358 | 1,186,290
Treasury shares issued | (8,197,662) | (1,798,468)
Treasury shares repurchased | 0 | (1,798,468)
Ending balance | 246,348,092 | 249,630,803
Restricted Stock |  |
Class Of Stock [Line Items] |  |
Restricted stock units vested | 1,226,473 | 720,212
Performance Share |  |
Class Of Stock [Line Items] |  |
Performance stock units issued | 279,420 | 12,283
Performance stock dividends | 18,700 | 464

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