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Disclosures on equity (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of detailed information about controls capital management [Abstract] |
Disclosure of detailed information about controls capital management [Text Block] | The Company’s management controls capital management based on the following ratios:
CAPITAL MANAGEMENT |  | 12/31/2017 | 12/31/2016 |  | Description (1) | Calculation (1)
Net Financial Debt ThUS$ |  | 245,508 | 461,569 |  | Financial Debt – Financial Resources | Other current Financial Liabilities + Other Non-Current Financial Liabilities – Cash and Cash Equivalents – Other Current Financial Assets – Hedging Assets, non-current
Liquidity |  | 3.29 | 4.02 |  | Current Asset divided by Current Liability | Total Current Assets / Total Current Liabilities
Net Debt / Capitalization |  | 0.10 | 0.17 |  | Net Financial Debt divided by Total Equity | Net financial debt / ( Net financial debt + Total Equity)
ROE |  | 19.1 % | 12.25 % |  | Income divided by Total Equity | Total Income / Equity (UH 12 months)
EBITDA (THUS$) |  | 894,588 | 796,134 |  | EBITDA | Gross Profit-Administrative Expenses + Adjustments for depreciation and amortization expenses.
ROA |  | 21.4 % | 16.0 % |  | EBITDA – Depreciation divided by Net Total Assets of financial resources less related parties’ investments | (Gross Income – Administrative Expenses)/ (Total Assets – Cash and Cash Equivalents – Other Current Financial Assets – Other Non-Current Financial Assets – Equity-accounted Investees) (UH 12 months)
Indebtedness |  | 0.91 | 0.83 |  | Total Liability on Equity | Total Liabilities / Total Equity
|  |  |  |  | (1) Assumes the absolute value of the accounting records
Disclosure of classes of share capital [text block] | Detail of types of capital in preference shares:
Type of capital in preferred shares |  | 12/31/2017 |  | 12/31/2016 |
Description of type of capital in preferred shares |  | Series A |  | Series B |  | Series A |  | Series B |
Number of authorized shares |  | 142,819,552 |  | 120,376,972 |  | 142,819,552 |  | 120,376,972 |
Number of fully subscribed and paid shares |  | 142,819,552 |  | 120,376,972 |  | 142,819,552 |  | 120,376,972 |
Number of subscribed, partially paid shares |  | - |  | - |  | - |  | - |
Par value of shares in ThUS$ |  | 0.9435 |  | 2.8464 |  | 0.9435 |  | 2.8464 |
Increase (decrease) in the number of current shares |  | - |  | - |  | - |  | - |
Number of current shares |  | 142,819,552 |  | 120,376,972 |  | 142,819,552 |  | 120,376,972 |
Number of shares owned by the entity or its subsidiaries or associates |  | - |  | - |  | - |  | - |
Number of shares whose issuance is reserved due to the existence of options or agreements to dispose shares |  | - |  | - |  | - |  | - |
Capital amount in shares ThUS$ |  | 134,750 |  | 342,636 |  | 134,750 |  | 342,636 |
Amount of premium issuance ThUS$ |  | - |  | - |  | - |  | - |
Amount of reserves ThUS$ |  | - |  | - |  | - |  | - |
Total number of subscribed shares, total |  | 142,819,552 |  | 120,376,972 |  | 142,819,552 |  | 120,376,972 |
As of December 31, 2017 and December 31, 2016, the Company has not placed any new issuances of shares on the market. 17.3 Disclosures on reserves in equity As of December 31, 2017 and December 31, 2016, this caption comprises the following:
|  |  | 12/31/2017 |  |  | 12/31/2016 |  |  | 12/31/2015 |
|  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |
Reserve for currency exchange conversion |  |  | (24,913) |  |  | (19,463) |  |  | (14,035) |
Reserve for cash flow hedges |  |  | 2,248 |  |  | 64 |  |  | (1,699) |
Reserve for gains and losses from financial assets measured at fair value through other comprehensive income |  |  | 2,937 |  |  | 3,513 |  |  | - |
Reserve for actuarial gains or losses in defined benefit plans |  |  | (5,953) |  |  | (4,834) |  |  | (2,386) |
Other reserves |  |  | 11,332 |  |  | 7,832 |  |  | (1,677) |
Total other reserves |  |  | (14,349) |  |  | (12,888) |  |  | (19,797) |
Disclosure of detailed information about movement in other reserves [Text Block] | Movements in other reserves and changes in interest were as follows:
|  | Foreign currency translation difference |  | Reserve for cash flow hedges |  | Reserve for actuarial gains and losses from defined benefit plans |  | Reserve for gains (losses) from financial assets measured at fair value through other comprehensive income |  | Other reserves |  | Total reserves |
Movements |  | Before taxes |  | Before taxes |  | Tax |  | Before taxes |  | Deferred taxes |  | Before taxes |  | Deferred taxes |  | Before taxes |  | Reserves |  | Deferred taxes |  | Total reserves |
|  | ThUS$ |  | ThUS$ |  | ThUS$ |  | ThUS$ |  | ThUS$ |  | ThUS$ |  | ThUS$ |  | ThUS$ |  | ThUS$ |  | ThUS$ |  | ThUS$ |
Opening balance as of 1/1/2016 |  | (14,035) |  | (2,144) |  | 445 |  | (2,077) |  | (309) |  | - |  | - |  | (1,677) |  | (19,933) |  | 136 |  | (19,797) |
Increase (decrease) in reserves |  | (5,428) |  | 3,626 |  | - |  | (3,397) |  | - |  | 4,813 |  | - |  | 9,509 |  | 9,123 |  | - |  | 9,123 |
Deferred taxes |  | - |  | - |  | (470) |  | - |  | 921 |  | - |  | (1,300) |  | - |  | - |  | (849) |  | (849) |
Reclassification of loss in reserves |  | - |  | (1,393) |  | - |  | 28 |  | - |  | - |  | - |  | - |  | (1,365) |  | - |  | (1,365) |
Closing balance as of 12/31/2016 |  | (19,463) |  | 89 |  | (25) |  | (5,446) |  | 612 |  | 4,813 |  | (1,300) |  | 7,832 |  | (12,175) |  | (713) |  | (12,888) |
Increase (decrease) in reserves |  | (5,450) |  | 2,159 |  | - |  | (1,401) |  |  |  | (26) |  | - |  | 3,500 |  | (1,218) |  | - |  | (1,218) |
Deferred taxes |  | - |  | - |  | 25 |  | - |  | 282 |  | - |  | (550) |  | - |  | - |  | (243) |  | (243) |
Reclassification of loss in reserves |  | - |  | - |  | - |  | - |  | - |  | - |  | - |  | - |  | - |  | - |  | - |
Closing balance as of 12/31/2017 |  | (24,913) |  | 2,248 |  | - |  | (6,847) |  | 894 |  | 4,787 |  | (1,850) |  | 11,332 |  | (13,393) |  | (956) |  | (14,349) |
Disclosure of detailed information about legal reserves reported in the individual financial statements of the subsidiaries [Text Block] | In the case of SQM Iberian S.A., the variation between the two periods corresponds to the results obtained in the previous financial year which are presented as forming part of other reserves because of local regulations.
|  |  | 12/31/2017 |  |  | 12/31/2016 |  |  | 12/31/2015 |
Subsidiary - Associate |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |
SQM Iberian S,A, |  |  | 9,464 |  |  | 5,964 |  |  | 5,963 |
SQM Europe NV |  |  | 1,957 |  |  | 1,957 |  |  | 1,958 |
Soquimich European holding B.V. |  |  | 828 |  |  | 828 |  |  | 828 |
Abu Dhabi Fertilizer Industries WWL |  |  | 455 |  |  | 455 |  |  | 455 |
Doktor Tarsa Tarim Sanayi AS |  |  | 305 |  |  | 305 |  |  | 305 |
Total |  |  | 13,009 |  |  | 9,509 |  |  | 9,509 |
Corresponds to the acquisition of the subsidiary SQM Iberian S.A., which was already under Company ownership at the acquisition date (IAS 27 R). |  |  | (1,677) |  |  | (1,677) |  |  | (1,677) |
Total Other reserves |  |  | 11,332 |  |  | 7,832 |  |  | 7,832 |
Disclosure of dividends [text block] | The dividends presented as deducted from equity are as follows:
|  |  | 12/31/2017 ThUS$ |  |  | 12/31/2016 ThUS$ |  |  | 12/31/2015 ThUS$ |
Dividends attributable to owners of the parent |  |  | 55,501 |  |  | 3,014 |  |  | 3.248 |
Provisional dividend |  |  | 317,243 |  |  | 225,000 |  |  | 106.584 |
Interim dividend |  |  |  |  |  | 150,000 |  |  | - |
Dividend payable |  |  | 110,529 |  |  | - |  |  | - |
Total |  |  | 483,273 |  |  | 378,014 |  |  | 109.832 |

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