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Shareholders Equity and Share Based Compensation - Summary of Performance base restricted share unit activity (Detail) - Performance-Based Restricted Share Unit [Member] - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Number of Performance-based Restricted Share Units, Beginning balance	739,000	1,056,666	128,000
Number of Performance-based Restricted Share Units, Granted	1,068,000	355,000	979,000
Number of Performance-based Restricted Share Units, Received			50,334
Number of Performance-based Restricted Share Units, Forfeited		(230,000)
Number of Performance-based Restricted Share Units, Exercised	(840,000)
Number of Performance-based Restricted Share Units, Forfeited/expired	(98,000)
Number of Performance-based Restricted Share Units, Ending balance	869,000	739,000	1,056,666
Number of Performance-based Restricted Share Units, Exercisable	75,000	30,000	175,333
Number of Performance-based Restricted Share Units, Forfeited		230,000
Number of Performance-based Restricted Share Units, Exercised	840,000
Number of Performance-based Restricted Share Units, Forfeited/expired	98,000
Weighted Average Grant Date Fair Value, Beginning balance	$ 7.92	$ 5.56	$ 2.82
Weighted Average Grant Date Fair Value, Granted	6.36	14.94	5.79
Weighted Average Grant Date Fair Value, Received			3.06
Weighted Average Grant Date Fair Value, Forfeited		12.90
Weighted Average Grant Date Fair Value, Exercised	6.47
Weighted Average Grant Date Fair Value, Forfeited/expired	9.59
Weighted Average Grant Date Fair Value, Ending balance	7.51	7.92	5.56
Weighted Average Grant Date Fair Value, Exercisable	$ 6.10	$ 12.87	$ 5.08
Exercise price in CA$7.82
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Number of Performance-based Restricted Share Units, Granted		442,666
Weighted Average Grant Date Fair Value, Granted		$ 7.82

X

- Definition

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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