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Capital Stock - Schedule of Changes in Number of Common Shares Outstanding (Detail) - shares	12 Months Ended
	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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