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Disclosures on equity (Tables) | 12 Months Ended
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Dec. 31, 2018
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 |  | 12/31/2018 |  |  | 12/31/2017 |  |  | Description (1) |  |  | Calculation (1)
Net Financial Debt ThUS$ |  |  | 471,755 |  |  |  | 245,508 |  |  |  | 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 |  |  | 4.32 |  |  |  | 3.29 |  |  |  | Current Assets divided by Current Liabilities |  |  | Total Current Assets / Total Current Liabilities
Net Debt / Capitalization |  |  | 0.18 |  |  |  | 0.10 |  |  |  | Net Financial Debt divided by Total Equity |  |  | Net financial debt / Total Equity
ROE |  |  | 20.7 | % |  |  | 19.1 | % |  |  | Profit for the year divided by Total Equity |  |  | LTM (2) Profit for the year / Equity
Adjusted EBITDA (ThUS$) |  |  | 885,652 |  |  |  | 901,856 |  |  |  | Adjusted EBITDA |  |  | Profit for the year + Depreciation and Amortization Expenses + Finance Costs + Income Tax – Other income – Other gains (losses) - Share of Profit of associates and joint ventures accounted for using the equity method + Other expenses by function + Net impairment gains or reversal (losses) of financial assets – Finance income – Currency differences
EBITDA (ThUS$) |  |  | 902,450 |  |  |  | 885,240 |  |  |  | EBITDA |  |  | Profit for the year + Depreciation and Amortization Expenses + Finance Costs + Income Tax
ROA |  |  | 20.31 | % |  |  | 21.3 | % |  |  | (Adjusted EBITDA – Depreciation) divided by Total Assets net of financial resources less related parties’ investments |  |  | (LTM Gross Profit – Administrative Expenses)/ (Total Assets – Cash and Cash Equivalents – Other Current Financial Assets – Other Non-Current Financial Assets – Equity-accounted Investments)
Indebtedness |  |  | 1.00 |  |  |  | 0.91 |  |  |  | Total Liabilities on Equity |  |  | Total Liabilities / Total Equity
(1) Assumes the absolute value of the accounting records (2) Last 12 months
Disclosure of classes of share capital [text block] | Detail of types of capital in preference shares:
Type of capital in preferred shares |  | 12/31/2018 |  |  | 12/31/2017 |
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, 2018 and December 31, 2017, the Company has not placed any new issuances of shares on the market.
| 19.3 | Disclosures on reserves in equity
As of December 31, 2018 and December 31, 2017, this caption comprises the following:
|  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |
Reserve for currency exchange conversion |  |  | (26,307 | ) |  |  | (24,913 | ) |  |  | (19,463 | )
Reserve for cash flow hedges |  |  | 7,971 |  |  |  | 2,248 |  |  |  | 64 |
Reserve for gains and losses from financial assets measured at fair value through other comprehensive income |  |  | (1,111 | ) |  |  | 2,937 |  |  |  | 3,513 |
Reserve for actuarial gains or losses in defined benefit plans |  |  | (6,884 | ) |  |  | (5,953 | ) |  |  | (4,834 | )
Other reserves |  |  | 11,332 |  |  |  | 11,332 |  |  |  | 7,832 |
Total other reserves |  |  | (14,999 | ) |  |  | (14,349 | ) |  |  | (12,888 | )
Disclosure of detailed information about movement in other reserves [Text Block] | Movements in other reserves and changes in interest were as follows:
Movements |  | Foreign currency translation difference |  |  | Gains from cash flow hedge |  |  | Losses from measurement of defined benefit plans |  |  | Gains (losses) from financial assets measured at fair value through other comprehensive income |  |  | Other reserves |  |  | Total reserves |
| 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 1/1/2017 |  |  | (19,463 | ) |  |  | 89 |  |  |  | (25 | ) |  |  | (5,446 | ) |  |  | 612 |  |  |  | 4,813 |  |  |  | (1,300 | ) |  |  | 7,832 |  |  |  | (12,175 | ) |  |  | (713 | ) |  |  | (12,888 | )
Statutory reserve subsidiaries |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 3,500 |  |  |  | 3,500 |  |  |  | - |  |  |  | 3,500 |
Currency translation associates and joint venture |  |  | (5,450 | ) |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (5,450 | ) |  |  | - |  |  |  | (5.450 | )
Adjustment for actuarial gains and losses |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (1,401 | ) |  |  | 282 |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (1.401 | ) |  |  | 282 |  |  |  | (1,119 | )
Derivate financial instruments for hedging FVOCI |  |  | - |  |  |  | 2,159 |  |  |  | 25 |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 2,159 |  |  |  | 25 |  |  |  | 2,184 |
Investments in shares at FVOCI |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (26 | ) |  |  | (550 | ) |  |  | - |  |  |  | (26 | ) |  |  | (550 | ) |  |  | (576 | )
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 | )
Currency translation associates and joint venture |  |  | (1,394 | ) |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (1.394 | ) |  |  | - |  |  |  | (1,394 | )
Adjustment for actuarial gains and losses |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (1.329 | ) |  |  | 398 |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (1.329 | ) |  |  | 398 |  |  |  | (931 | )
Derivate financial instruments for hedging FVOCI |  |  | - |  |  |  | 5,723 |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 5,723 |  |  |  | - |  |  |  | 5,723 |
Investments in shares at FVOCI |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (5.546 | ) |  |  | 1,498 |  |  |  | - |  |  |  | (5.546 | ) |  |  | 1,498 |  |  |  | (4,048 | )
Closing balance as of 12/31/2018 |  |  | (26,307 | ) |  |  | 7,971 |  |  |  | - |  |  |  | (8,176 | ) |  |  | 1,292 |  |  |  | (759 | ) |  |  | (352 | ) |  |  | 11,332 |  |  |  | (15,939 | ) |  |  | 940 |  |  |  | (14,999 | )
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 balance corresponds to the results obtained in the previous financial year which are presented as forming part of other reserves because of local regulations.
|  | 12/31/2018 |  |  | 12/31/2017 |  |  | 12/31/2016 |
Subsidiary - Associate |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |
SQM Iberian S.A. (*) |  |  | 9,464 |  |  |  | 9,464 |  |  |  | 5,964 |
SQM Europe NV |  |  | 1,957 |  |  |  | 1,957 |  |  |  | 1,957 |
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 |  |  |  | 13,009 |  |  |  | 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 |  |  |  | 11,332 |  |  |  | 7,832 |
Disclosure of dividends [text block] | The dividends presented as deducted from equity are as follows:
|  | 12/31/2018 ThUS$ |  |  | 12/31/2017 ThUS$ |  |  | 12/31/2016 ThUS$ |
Dividends attributable to owners of the parent |  |  | 823 |  |  |  | 55,501 |  |  |  | 3,014 |
Provisional dividend |  |  | 331,199 |  |  |  | 317,243 |  |  |  | 225,000 |
Additional dividend |  |  | 107,872 |  |  |  | - |  |  |  | 150,000 |
Dividend payable |  |  | 109,669 |  |  |  | 110,529 |  |  |  | - |
Total |  |  | 549,563 |  |  |  | 483,273 |  |  |  | 378,014 |

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