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Other assets - Schedule of Other Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Restricted cash $ 36,232 $ 28,404
OPEB plan assets (note 10(a)) 11,963 10,662
Long-term deposits 10,735 13,459
Income taxes recoverable 7,649 4,717
Deferred financing costs (a) 30,544 6,774
Other 14,891 9,953
Total other assets 112,014 73,969
Less: current portion (16,153) (7,266)
Other assets (note 11) $ 95,861 $ 66,703