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Shareholder's capital - Performance Stock Units (Detail) - CAD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Weighted average remaining contractual term (years)
Weighted average remaining contractual term, Exercisable	5 years 7 months 17 days
Performance and restricted share units
Number of awards
Beginning balance (in shares)	2,443,672	2,721,207
Granted, including dividends (in shares)	1,090,457	805,433
Exercised (in shares)	(1,221,620)	(865,067)
Forfeited (in shares)	(202,799)	(217,901)
Ending balance (in shares)	2,109,710	2,443,672	2,721,207
Exercisable (in shares)	769,458
Weighted average grant-date fair value
Beginning balance (in USD per share)	$ 18.07	$ 16.58
Granted, including dividends (in USD per share)	17.99	19.94
Exercised (in USD per share)	12.62	13.79
Forfeited (in USD per share)	18.94	18.64
Ending balance (in USD per share)	18.38	$ 18.07	$ 16.58
Exercisable (in USD per share)	$ 18.70
Weighted average remaining contractual term (years)
Outstanding, Weighted average remaining contractual term	1 year 9 months 3 days	1 year 8 months 19 days	11 months 4 days
Granted, including dividends, Weighted average remaining contractual term	2 years	2 years 9 months 7 days
Weighted average remaining contractual term, Exercisable	1 month 6 days
Outstanding, aggregate intrinsic value	$ 18,608	$ 44,646	$ 54,560
Granted, including dividends, aggregate intrinsic value	17,524	12,881
Exercised, aggregate intrinsic value	23,636	17,005
Forfeited, aggregate intrinsic value	418	$ 3,981
Exercisable, aggregate intrinsic value	$ 6,787

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of non-option equity instruments exercised by participants.

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Net number of non-option equity instruments granted to participants.

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