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Financial instruments - related risk management (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of detailed information about financial instruments [line items]      
Financial assets $ 1,109,485 $ 683,240  
Financial liabilities (1,815,869) (1,904,691)  
Gain on derivatives 56,250 34,407  
Finance income 5,265 4,379  
Disclosure of credit risk exposure [abstract]      
Cash and cash equivalents 591,620 320,278 $ 458,604
Advances receivable from JV Inkai LLP 58,820 90,095  
Derivative assets $ 40,804 10,612  
Other   4,966  
Currency risk [member]      
Disclosure of detailed information about financial instruments [line items]      
Percentage increase or decrease in CAD$ 5.00%    
Currency risk [member] | Cash and cash equivalents [member] | EUR [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets $ 23,495    
Gain (loss), foreign exchange 1,175    
Currency risk [member] | Cash and cash equivalents [member] | USD [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets 149,655    
Gain (loss), foreign exchange 7,483    
Currency risk [member] | Accounts receivable [Member] | USD [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets 333,240    
Gain (loss), foreign exchange 16,662    
Currency risk [member] | Accounts receivable [Member] | KZT      
Disclosure of detailed information about financial instruments [line items]      
Financial assets 42,032    
Gain (loss), foreign exchange 2,212    
Currency risk [member] | Long-term receivables, investments and other [Member] | USD [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets 58,820    
Gain (loss), foreign exchange 2,941    
Currency risk [member] | Accounts Payable and Accrued Liabilities [Member] | USD [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities (88,281)    
Gain (loss), foreign exchange (4,414)    
Currency risk [member] | Net foreign currency derivatives [Member] | USD [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities 34,360    
Gain (loss), foreign exchange $ (59,965)    
Interest rate risk [member]      
Disclosure of detailed information about financial instruments [line items]      
Percentage increase or decrease in the interest rate 1.00%    
Interest rate risk [member] | Interest rate contracts [member]      
Disclosure of detailed information about financial instruments [line items]      
Gain on derivatives $ (3,009)    
Interest rate risk [member] | Advances receivable from Inkai [Member]      
Disclosure of detailed information about financial instruments [line items]      
Finance income 611    
Credit risk [member]      
Disclosure of credit risk exposure [abstract]      
Cash and cash equivalents 591,620 320,278  
Accounts receivable 393,213 238,514  
Advances receivable from JV Inkai LLP 58,820 90,095  
Derivative assets 40,804 10,612  
Other $ 0 $ 4,966