Income Taxes - Summary of Tax Effects of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Deferred assets
Operating loss carryforwards - Canada	$ 69,100	$ 59,755	$ 13,723
Property and equipment			2,510
Currently nondeductible interest	7,658	4,915
Partnership interests	34,869	21,546
Deferred financing costs	214	208	27
Investment tax credits and related pool balance	566	180	57
Other	6,794	931
Total Deferred tax assets	153,582	98,536	21,097
Less valuation allowance	(149,655)	(84,337)	(14,433)
Net deferred tax assets	3,927	14,199	6,664
Deferred tax liabilities
Property and equipment	(1,582)	(5,800)	(2,328)
Intangible assets	(48,456)	(54,814)	(289)
Equity portion of convertible notes	(3,163)	(6,948)	(8,471)
Total deferred tax liabilities	(53,201)	(67,562)	(11,088)
Net deferred tax liability	(49,274)	(53,363)	(4,424)
United States [Member]
Deferred assets
Operating loss carryforwards	28,575	5,843	4,173
Other Countries [Member]
Deferred assets
Operating loss carryforwards	$ 5,806	$ 5,158	$ 607