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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, 2017
USD ($)
Dec. 31, 2017
CAD ($)
Dec. 31, 2017
BRL (R$)
Dec. 31, 2017
EUR (€)
Dec. 31, 2017
AUD ($)
Dec. 31, 2017
GBP (£)
Dec. 31, 2017
RSD (дин)
Dec. 31, 2017
TRY (₺)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2017
RON ( )
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Disclosure of nature and extent of risks arising from financial instruments [line items]                        
Cash and cash equivalents $ 479,501                   $ 883,171 $ 288,189
Marketable securities 5,010                   28,327  
Accounts receivable and other 78,344                   54,315  
Accounts payable and accrued liabilities (110,651)                   $ (90,705)  
Canadian dollar [member] | Currency risk [member]                        
Disclosure of nature and extent of risks arising from financial instruments [line items]                        
Cash and cash equivalents   $ 18,280                    
Marketable securities   6,286                    
Accounts receivable and other   13,706                    
Accounts payable and accrued liabilities   (30,900)                    
Other non-current liability   (1,269)                    
Net balance 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         $ 482              
Accounts receivable and other         4              
Accounts payable and accrued liabilities         (42)              
Net balance 347       $ 444              
Euro [member] | Currency risk [member]                        
Disclosure of nature and extent of risks arising from financial instruments [line items]                        
Cash and cash equivalents | €       € 13,030                
Accounts receivable and other | €       24,508                
Accounts payable and accrued liabilities | €       (45,751)                
Other non-current liability | €       (6,516)                
Net balance (17,664)     € (14,729)                
Turkish lira [member] | Currency risk [member]                        
Disclosure of nature and extent of risks arising from financial instruments [line items]                        
Cash and cash equivalents | ₺               ₺ 4,965        
Accounts receivable and other | ₺               60,111        
Accounts payable and accrued liabilities | ₺               (50,099)        
Other non-current liability | ₺               (17,999)        
Net balance (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 | ¥                 ¥ 77      
Net balance 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 4,845          
Accounts receivable and other | дин             43,157          
Accounts payable and accrued liabilities | дин             (9,000)          
Net balance 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 |                   9,730    
Accounts receivable and other |                   7,542    
Accounts payable and accrued liabilities |                   (6,174)    
Net balance 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 | £           £ 366            
Net balance 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$ 15,991                  
Accounts receivable and other | R$     12,547                  
Accounts payable and accrued liabilities | R$     (5,559)                  
Net balance $ 6,946   R$ 22,979