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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 |

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