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Financial risk management - Summary of Exposure to Various Currencies Denominated in Foreign Currency (Details)
₺ in Thousands, € in Thousands, $ in Thousands, $ in Thousands
Dec. 31, 2020
USD ($)
Dec. 31, 2020
CAD ($)
Dec. 31, 2020
EUR (€)
Dec. 31, 2020
TRY (₺)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CAD ($)
Dec. 31, 2019
EUR (€)
Dec. 31, 2019
TRY (₺)
Dec. 31, 2018
USD ($)
Disclosure of nature and extent of risks arising from financial instruments [line items]                  
Cash and cash equivalents $ 451,962       $ 177,742       $ 286,312
Marketable securities 194       3,828        
Accounts receivable and other 73,216       79,138        
Accounts payable and accrued liabilities (179,372)       (139,104)        
Currency risk | Canadian dollar                  
Disclosure of nature and extent of risks arising from financial instruments [line items]                  
Cash and cash equivalents   $ 147,877       $ 10,204      
Marketable securities   252       4,971      
Accounts receivable and other   13,154       13,010      
Accounts payable and accrued liabilities   (66,387)       (59,583)      
Other non-current liability   (72)       (1,520)      
Net assets 74,459 $ 94,824     (25,259) $ (32,918)      
Currency risk | Euro                  
Disclosure of nature and extent of risks arising from financial instruments [line items]                  
Cash and cash equivalents | €     € 7,186       € 10,692    
Marketable securities | €     0       0    
Accounts receivable and other | €     36,982       8,631    
Accounts payable and accrued liabilities | €     (41,299)       (47,361)    
Other non-current liability | €     (14,219)       (11,497)    
Net assets (13,909)   € (11,350)   (44,213)   € (39,535)    
Currency risk | Turkish lira                  
Disclosure of nature and extent of risks arising from financial instruments [line items]                  
Cash and cash equivalents | ₺       ₺ 3,675       ₺ 9,930  
Marketable securities | ₺       0       0  
Accounts receivable and other | ₺       52,354       8,923  
Accounts payable and accrued liabilities | ₺       (418,674)       (109,765)  
Other non-current liability | ₺       (31,043)       0  
Net assets (53,632)     ₺ (393,688) (14,801)     ₺ (90,912)  
Currency risk | Other Foreign Currency                  
Disclosure of nature and extent of risks arising from financial instruments [line items]                  
Net assets $ 6,420       $ 2,947