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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, 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 acquired | (8,199,194) | (1,798,468)
Ending balance | 246,072,806 | 249,630,803
Restricted Stock |  |
Class Of Stock [Line Items] |  |
Restricted stock units vested | 952,719 | 720,212
Performance Share |  |
Class Of Stock [Line Items] |  |
Performance stock units issued | 279,420 | 12,747
Performance stock dividends | 18,700,000 | 0

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