Income Taxes - Summary of (Recoveries) Expenses for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current income tax (recoveries) expenses:
Other countries	$ 89	$ 134	$ 34
Canada	(88)	112
Total	(226)	397	34
Deferred income tax recoveries:
Other countries	102	(1,074)
Canada	(4,909)	(3,383)
Total	(5,376)	(8,847)	(4,485)
Income tax benefits, net	(5,602)	(8,450)	(4,451)
United States [Member]
Current income tax (recoveries) expenses:
Other countries	(227)	151
Deferred income tax recoveries:
Other countries	$ (569)	$ (4,390)	$ (4,485)