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Financial risk management - Summary of Exposure to Various Currencies Denominated in Foreign Currency (Detail)
₺ in Thousands, € in Thousands, дин in Thousands, ¥ in Thousands, £ in Thousands, R$ in Thousands, $ in Thousands, $ in Thousands, $ in Thousands, in Thousands
Dec. 31, 2018
EUR (€)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
BRL (R$)
Dec. 31, 2018
RON ( )
Dec. 31, 2018
GBP (£)
Dec. 31, 2018
RSD (дин)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2018
AUD ($)
Dec. 31, 2018
TRY (₺)
Dec. 31, 2018
CAD ($)
Dec. 31, 2017
EUR (€)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
BRL (R$)
Dec. 31, 2017
RON ( )
Dec. 31, 2017
GBP (£)
Dec. 31, 2017
RSD (дин)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2017
AUD ($)
Dec. 31, 2017
TRY (₺)
Dec. 31, 2017
CAD ($)
Dec. 31, 2016
USD ($)
Disclosure of nature and extent of risks arising from financial instruments [line items]                                          
Cash and cash equivalents   $ 286,312                   $ 479,501                 $ 883,171
Marketable securities   2,572                   5,010                  
Accounts receivable and other   80,987                   78,344                  
Accounts payable and accrued liabilities   (140,878)                   (110,541)                  
Canadian dollar [member] | Currency risk [member]                                          
Disclosure of nature and extent of risks arising from financial instruments [line items]                                          
Cash and cash equivalents                   $ 19,030                   $ 18,280  
Marketable securities                   3,509                   6,286  
Accounts receivable and other                   23,672                   13,706  
Accounts payable and accrued liabilities                   (102,027)                   (30,900)  
Other non-current liability                   (10,064)                   (1,269)  
Net assets   (48,292)               $ (65,880)   4,865               $ 6,103  
Australian dollar [member] | Currency risk [member]                                          
Disclosure of nature and extent of risks arising from financial instruments [line items]                                          
Cash and cash equivalents               $ 433                   $ 482      
Accounts receivable and other               3                   4      
Accounts payable and accrued liabilities               (7)                   (42)      
Net assets   302           $ 429       347           $ 444      
Euro [member] | Currency risk [member]                                          
Disclosure of nature and extent of risks arising from financial instruments [line items]                                          
Cash and cash equivalents | € € 6,861                   € 13,030                    
Accounts receivable and other | € 15,552                   24,508                    
Accounts payable and accrued liabilities | € (34,488)                   (45,751)                    
Other non-current liability | € (9,191)                   (6,516)                    
Net assets € (21,266) (24,334)                 € (14,729) (17,664)                  
Turkish lira [member] | Currency risk [member]                                          
Disclosure of nature and extent of risks arising from financial instruments [line items]                                          
Cash and cash equivalents | ₺                 ₺ 2,664                   ₺ 4,965    
Accounts receivable and other | ₺                 54,772                   60,111    
Accounts payable and accrued liabilities | ₺                 (44,516)                   (50,099)    
Other non-current liability | ₺                 (15,877)                   (17,999)    
Net assets   (562)             ₺ (2,957)     (802)             ₺ (3,022)    
Chinese renminbi [member] | Currency risk [member]                                          
Disclosure of nature and extent of risks arising from financial instruments [line items]                                          
Cash and cash equivalents | ¥             ¥ 72                   ¥ 77        
Net assets   11         ¥ 72         12         ¥ 77        
Serbian Dinar [member] | Currency risk [member]                                          
Disclosure of nature and extent of risks arising from financial instruments [line items]                                          
Cash and cash equivalents | дин           дин 8,848                   дин 4,845          
Accounts receivable and other | дин           8,386                   43,157          
Accounts payable and accrued liabilities | дин           (1,004)                   (9,000)          
Net assets   157       дин 16,230           394       дин 39,002          
Romanian lei [member] | Currency risk [member]                                          
Disclosure of nature and extent of risks arising from financial instruments [line items]                                          
Cash and cash equivalents |       1,904                   9,730              
Accounts receivable and other |       4,487                   7,542              
Accounts payable and accrued liabilities |       (2,286)                   (6,174)              
Net assets   1,010   4,105               2,874   11,098              
Great British pound [member] | Currency risk [member]                                          
Disclosure of nature and extent of risks arising from financial instruments [line items]                                          
Cash and cash equivalents | £         £ 923                   £ 366            
Net assets   1,180     £ 923             495     £ 366            
Brazilian real [member] | Currency risk [member]                                          
Disclosure of nature and extent of risks arising from financial instruments [line items]                                          
Cash and cash equivalents | R$     R$ 4,539                   R$ 15,991                
Accounts receivable and other | R$     9,970                   12,547                
Accounts payable and accrued liabilities | R$     (2,941)                   (5,559)                
Net assets   $ 2,982 R$ 11,568                 $ 6,946 R$ 22,979