Capital Stock - Schedule of Changes in Number of Common Shares Outstanding (Detail) - shares	3 Months Ended	12 Months Ended
Mar. 31, 2021	Dec. 31, 2020
Class Of Stock [Line Items]
Beginning balance	246,348,092	249,630,803
Restricted stock grants	1,114,922	3,390,358
Treasury shares	1,112	(8,197,662)
Ending balance	249,590,550	246,348,092
Restricted Stock
Class Of Stock [Line Items]
Restricted stock units vested	1,471,990	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

Treasury stock shares acquired and issued.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Number of shares of common stock issued as dividends during the period. Excludes stock splits.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Number of new stock issued during the period.

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Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards.

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