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Income taxes - Additional Information (Detail) - USD ($) $ in Thousands		12 Months Ended
	Apr. 08, 2020	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Canadian enacted statutory rate (percent)		26.50%	26.50%
U.S. Tax reform and related deferred tax adjustments	$ 9,300
Valuation allowance for deferred tax assets		$ 29,824	$ 29,447
Undistributed earnings of foreign subsidiaries		$ 504,149

X

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates.

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Amount of undistributed earnings of foreign subsidiaries intended to be permanently reinvested outside the country of domicile.

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