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Financial instruments (Details 25) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Investment |  |
Financial assets, at fair value | $ 249 |
Shares [Member] |  |
Investment |  |
Financial assets, at fair value | 9,159 |
Forwards [Member] |  |
Investment |  |
Financial assets, at fair value | 2,744 | $ 924
Non-hedging derivatives |  |
Financial liabilities, at fair value | 5,534 | 871
Options [Member] |  |
Investment |  |
Financial assets, at fair value | 110 | 426
Non-hedging derivatives |  |
Financial liabilities, at fair value | 445 | 363
Swaps [Member] |  |
Investment |  |
Financial assets, at fair value | 3,184 | 2,745
Swaps [Member] |  |
Investment |  |
Financial assets, at fair value | 8,726 | 8,090
Others [Member] |  |
Investment |  |
Financial assets, at fair value |  | 2,809
Non-hedging derivatives |  |
Financial liabilities, at fair value | 5,945 | 16,041
Swaps [Member] |  |
Investment |  |
Financial assets, at fair value |  | 6,879
Non-hedging derivatives |  |
Financial liabilities, at fair value | 37,287 | 50,713
Investment SQM Australia [Member] |  |
Investment |  |
Financial assets, at fair value | 24,746 |
Deposits, more than 90 days [Member] |  |
Investment |  |
Financial assets, at fair value | 360,941 | 284,159
Bank loans [Member] |  |
Non-hedging derivatives |  |
Financial liabilities, at fair value | 163,568 | 101,270
Non guaranteed bonds [Member] |  |
Non-hedging derivatives |  |
Financial liabilities, at fair value | 1,039,956 | 1,103,324
Level 1 [member] |  |
Investment |  |
Financial assets, at fair value | 0 |
Level 1 [member] | Shares [Member] |  |
Investment |  |
Financial assets, at fair value | 9,159 |
Level 1 [member] | Forwards [Member] |  |
Investment |  |
Financial assets, at fair value | 0 | 0
Non-hedging derivatives |  |
Financial liabilities, at fair value | 0 | 0
Level 1 [member] | Options [Member] |  |
Investment |  |
Financial assets, at fair value | 0 | 0
Non-hedging derivatives |  |
Financial liabilities, at fair value | 0 | 0
Level 1 [member] | Swaps [Member] |  |
Investment |  |
Financial assets, at fair value | 0 | 0
Level 1 [member] | Swaps [Member] |  |
Investment |  |
Financial assets, at fair value | 0 | 0
Level 1 [member] | Others [Member] |  |
Investment |  |
Financial assets, at fair value |  | 0
Non-hedging derivatives |  |
Financial liabilities, at fair value | 0 | 0
Level 1 [member] | Swaps [Member] |  |
Investment |  |
Financial assets, at fair value |  | 6,879
Non-hedging derivatives |  |
Financial liabilities, at fair value | 0 | 0
Level 1 [member] | Investment SQM Australia [Member] |  |
Investment |  |
Financial assets, at fair value | 24,746 |
Level 1 [member] | Bank loans [Member] |  |
Non-hedging derivatives |  |
Financial liabilities, at fair value | 0 | 0
Level 1 [member] | Non guaranteed bonds [Member] |  |
Non-hedging derivatives |  |
Financial liabilities, at fair value | 0 | 0
Level 2 [member] |  |
Investment |  |
Financial assets, at fair value | 249 |
Level 2 [member] | Shares [Member] |  |
Investment |  |
Financial assets, at fair value | 0 |
Level 2 [member] | Forwards [Member] |  |
Investment |  |
Financial assets, at fair value | 2,744 | 924
Non-hedging derivatives |  |
Financial liabilities, at fair value | 5,534 | 871
Level 2 [member] | Options [Member] |  |
Investment |  |
Financial assets, at fair value | 110 | 426
Non-hedging derivatives |  |
Financial liabilities, at fair value | 445 | 363
Level 2 [member] | Swaps [Member] |  |
Investment |  |
Financial assets, at fair value | 3,184 | 2,745
Level 2 [member] | Swaps [Member] |  |
Investment |  |
Financial assets, at fair value | 8,726 | 8,090
Level 2 [member] | Others [Member] |  |
Investment |  |
Financial assets, at fair value |  | 2,809
Non-hedging derivatives |  |
Financial liabilities, at fair value | 5,945 | 16,041
Level 2 [member] | Swaps [Member] |  |
Investment |  |
Financial assets, at fair value |  | 0
Non-hedging derivatives |  |
Financial liabilities, at fair value | 37,287 | 50,713
Level 2 [member] | Investment SQM Australia [Member] |  |
Investment |  |
Financial assets, at fair value | 0 |
Level 2 [member] | Deposits, more than 90 days [Member] |  |
Investment |  |
Financial assets, at fair value | 360,941 | 284,159
Level 2 [member] | Bank loans [Member] |  |
Non-hedging derivatives |  |
Financial liabilities, at fair value | 163,568 | 101,270
Level 2 [member] | Non guaranteed bonds [Member] |  |
Non-hedging derivatives |  |
Financial liabilities, at fair value | 1,039,956 | 1,103,324
Level 3 [member] |  |
Investment |  |
Financial assets, at fair value | 0 |
Level 3 [member] | Shares [Member] |  |
Investment |  |
Financial assets, at fair value | 0 |
Level 3 [member] | Forwards [Member] |  |
Investment |  |
Financial assets, at fair value | 0 | 0
Non-hedging derivatives |  |
Financial liabilities, at fair value | 0 | 0
Level 3 [member] | Options [Member] |  |
Investment |  |
Financial assets, at fair value | 0 | 0
Non-hedging derivatives |  |
Financial liabilities, at fair value | 0 | 0
Level 3 [member] | Swaps [Member] |  |
Investment |  |
Financial assets, at fair value | 0 | 0
Level 3 [member] | Swaps [Member] |  |
Investment |  |
Financial assets, at fair value | 0 | 0
Level 3 [member] | Others [Member] |  |
Investment |  |
Financial assets, at fair value |  | 0
Non-hedging derivatives |  |
Financial liabilities, at fair value | 0 | 0
Level 3 [member] | Swaps [Member] |  |
Investment |  |
Financial assets, at fair value |  | 0
Non-hedging derivatives |  |
Financial liabilities, at fair value | 0 | 0
Level 3 [member] | Investment SQM Australia [Member] |  |
Investment |  |
Financial assets, at fair value | 0 |
Level 3 [member] | Deposits, more than 90 days [Member] |  |
Investment |  |
Financial assets, at fair value | 0 | 0
Level 3 [member] | Bank loans [Member] |  |
Non-hedging derivatives |  |
Financial liabilities, at fair value | 0 | 0
Level 3 [member] | Non guaranteed bonds [Member] |  |
Non-hedging derivatives |  |
Financial liabilities, at fair value | $ 0 | $ 0

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