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Reconciliation between net income and Partners' Equity determined under IFRS and U.S. GAAP (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Disclosure Of Reconciliation between net income and Partners' Equity determined under IFRS and U.S. GAAP [Line Items]        
Profit (loss)for the year $ 64,435 $ (327,814) $ (375,545)  
Items increasing (decreasing) reported net profit:        
Impairment loss 21,620 0 3,803  
Net loss 64,435 (327,814) (375,545)  
Equity 3,063,627 3,047,213 3,389,236 $ 3,762,125
Items increasing (decreasing) reported Partners' equity:        
Equity 3,063,627 3,047,213 3,389,236 $ 3,762,125
Effect of transition to IFRSs [member] | Impairment loss [Member]        
Items increasing (decreasing) reported net profit:        
Impairment loss 0 (889,499) 0  
Equity (2,469,188) (2,469,188)    
Items increasing (decreasing) reported Partners' equity:        
Equity (2,469,188) (2,469,188)    
Effect of transition to IFRSs [member] | Reversal of depreciation of assets impaired [Member]        
Disclosure Of Reconciliation between net income and Partners' Equity determined under IFRS and U.S. GAAP [Line Items]        
Profit (loss)for the year 294,454 101,855 125,943  
Items increasing (decreasing) reported net profit:        
Net loss 294,454 101,855 125,943  
Equity 674,260 379,806    
Items increasing (decreasing) reported Partners' equity:        
Equity 674,260 379,806    
Effect of transition to IFRSs [member] | Elimination of impairment loss recorded under US GAAP [Member]        
Disclosure Of Reconciliation between net income and Partners' Equity determined under IFRS and U.S. GAAP [Line Items]        
Profit (loss)for the year 0 933,200 0  
Items increasing (decreasing) reported net profit:        
Net loss 0 933,200 0  
Equity 933,200 933,200    
Items increasing (decreasing) reported Partners' equity:        
Equity 933,200 933,200    
Effect of transition to IFRSs [member] | Elimination of valuation allowance of deferred worker's profit participation [Member]        
Disclosure Of Reconciliation between net income and Partners' Equity determined under IFRS and U.S. GAAP [Line Items]        
Profit (loss)for the year 0 0 41,909  
Items increasing (decreasing) reported net profit:        
Net loss 0 0 41,909  
Effect of transition to IFRSs [member] | Stripping activity asset [Member]        
Disclosure Of Reconciliation between net income and Partners' Equity determined under IFRS and U.S. GAAP [Line Items]        
Profit (loss)for the year (6,360) 22,156 18,868  
Items increasing (decreasing) reported net profit:        
Net loss (6,360) 22,156 18,868  
Equity 34,709 41,069    
Items increasing (decreasing) reported Partners' equity:        
Equity 34,709 41,069    
Effect of transition to IFRSs [member] | Reclamation and mine closure [Member]        
Disclosure Of Reconciliation between net income and Partners' Equity determined under IFRS and U.S. GAAP [Line Items]        
Profit (loss)for the year (90,079) 22,278 12,049  
Items increasing (decreasing) reported net profit:        
Net loss (90,079) 22,278 12,049  
Equity (135,004) (44,925)    
Items increasing (decreasing) reported Partners' equity:        
Equity (135,004) (44,925)    
Effect of transition to IFRSs [member] | Inventories [Member]        
Disclosure Of Reconciliation between net income and Partners' Equity determined under IFRS and U.S. GAAP [Line Items]        
Profit (loss)for the year 17,169 (36,076) (20,903)  
Items increasing (decreasing) reported net profit:        
Net loss 17,169 (36,076) (20,903)  
Equity (13,120) (30,289)    
Items increasing (decreasing) reported Partners' equity:        
Equity (13,120) (30,289)    
Effect of transition to IFRSs [member] | Deferred workers' profit participation [Member]        
Disclosure Of Reconciliation between net income and Partners' Equity determined under IFRS and U.S. GAAP [Line Items]        
Profit (loss)for the year 0 0 (2,790)  
Items increasing (decreasing) reported net profit:        
Net loss 0 0 (2,790)  
Effect of transition to IFRSs [member] | Valuation allowance of deferred income tax [Member]        
Disclosure Of Reconciliation between net income and Partners' Equity determined under IFRS and U.S. GAAP [Line Items]        
Profit (loss)for the year 0 0 (321,622)  
Items increasing (decreasing) reported net profit:        
Net loss 0 0 (321,622)  
Effect of transition to IFRSs [member] | Deferred income tax of reconciliation items [Member]        
Disclosure Of Reconciliation between net income and Partners' Equity determined under IFRS and U.S. GAAP [Line Items]        
Profit (loss)for the year 0 0 (43,441)  
Items increasing (decreasing) reported net profit:        
Net loss 0 0 (43,441)  
Effect of transition to IFRSs [member] | Others [Member]        
Disclosure Of Reconciliation between net income and Partners' Equity determined under IFRS and U.S. GAAP [Line Items]        
Profit (loss)for the year (1,100) (137) (2,008)  
Items increasing (decreasing) reported net profit:        
Net loss (1,100) (137) (2,008)  
Equity (3,333) (4,639)    
Items increasing (decreasing) reported Partners' equity:        
Equity (3,333) (4,639)    
Previous GAAP [member]        
Disclosure Of Reconciliation between net income and Partners' Equity determined under IFRS and U.S. GAAP [Line Items]        
Profit (loss)for the year (118,127) (1,191,319) (252,159)  
Items increasing (decreasing) reported net profit:        
Net loss (118,127) (1,191,319) (252,159)  
Equity 1,759,039 1,928,321    
Items increasing (decreasing) reported Partners' equity:        
Equity 1,759,039 1,928,321    
Previous GAAP [member] | Reversal of depreciation of assets impaired [Member]        
Disclosure Of Reconciliation between net income and Partners' Equity determined under IFRS and U.S. GAAP [Line Items]        
Profit (loss)for the year (237,906) 0 0  
Items increasing (decreasing) reported net profit:        
Net loss (237,906) 0 0  
Equity (237,906) 0    
Items increasing (decreasing) reported Partners' equity:        
Equity (237,906) 0    
Previous GAAP [member] | Asset retirement obligation [Member]        
Disclosure Of Reconciliation between net income and Partners' Equity determined under IFRS and U.S. GAAP [Line Items]        
Profit (loss)for the year (35,911) (6,210) (6,041)  
Items increasing (decreasing) reported net profit:        
Net loss (35,911) (6,210) (6,041)  
Equity 116,458 152,369    
Items increasing (decreasing) reported Partners' equity:        
Equity 116,458 152,369    
Previous GAAP [member] | Recognition of account receivable to tax authority [Member]        
Disclosure Of Reconciliation between net income and Partners' Equity determined under IFRS and U.S. GAAP [Line Items]        
Profit (loss)for the year 2,405 0 0  
Items increasing (decreasing) reported net profit:        
Net loss $ 2,405 $ 0 $ 0