Income Taxes - Loss Before Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Canada	$ (96,337)	$ (151,736)	$ (25,333)
Loss before income taxes	(276,675)	(329,619)	(72,174)
United States [Member]
Other countries	(168,480)	(156,010)	(42,418)
Portugal [Member]
Other countries	(4,730)	(11,781)	(2,208)
Other Countries [Member]
Other countries	$ (7,128)	$ (10,092)	$ (2,215)