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Capital Stock - Schedule of Changes in Number of Common Shares Outstanding (Detail) - shares | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Class Of Stock [Line Items] |  |  |
Beginning balance | 249,510,022 | 248,129,430 | 247,144,356
Restricted stock grants | 1,186,290 | 865,095 | 539,096
Treasury shares issued |  | 5,302 | 15,580
Treasury shares repurchased | (1,798,468) |  |
Ending balance | 249,630,803 | 249,510,022 | 248,129,430
Restricted Stock |  |  |
Class Of Stock [Line Items] |  |  |
Restricted stock units vested | 720,212 | 434,046 | 344,937
Performance Share |  |  |
Class Of Stock [Line Items] |  |  |
Performance stock units issued | 12,747 | 76,149 | 85,461

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