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Financial instruments (Details 13) |  |  |  | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 03, 2013 USD ($) | Apr. 04, 2012 USD ($) | Jan. 13, 2009 USD ($) | Oct. 23, 2014 USD ($) | Apr. 21, 2010 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Apr. 05, 2018 | Apr. 04, 2012 CLF ( ) | Jan. 13, 2009 CLF ( ) | Jan. 24, 2006 USD ($) | Jan. 24, 2006 CLF ( )
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Effective rate |  |  |  |  |  |  |  | 3.25% |  |  |  |
Notional Amount |  |  |  |  |  | $ 290,397,000 | $ 95,623,000 |  |  |  |  |
Non-current maturities |  |  |  |  |  |  | 1,069,592,000 |  |  |  |  |
Bond issuance costs |  |  |  |  |  | (1,639,000) | (9,886,000) |  |  |  |  |
Total |  |  |  |  |  | $ 1,031,507,000 | 1,059,706,000 |  |  |  |  |
Over 1 year to 2 [member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  |  | 5,903,000 |  |  |  |  |
Non-current maturities |  |  |  |  |  |  | 5,903,000 |  |  |  |  |
Over 2 years to 3 [member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  |  | 255,903,000 |  |  |  |  |
Non-current maturities |  |  |  |  |  |  | 255,903,000 |  |  |  |  |
Over 3 Years to 4 [member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  |  | 5,903,000 |  |  |  |  |
Non-current maturities |  |  |  |  |  |  | 5,903,000 |  |  |  |  |
Over 4 Years to 5 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  |  | 5,903,000 |  |  |  |  |
Non-current maturities |  |  |  |  |  |  | 5,903,000 |  |  |  |  |
Over 5 years [member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  |  | 795,980,000 |  |  |  |  |
Non-current maturities |  |  |  |  |  |  | 795,980,000 |  |  |  |  |
Single series bond One [Member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Tax ID |  |  |  |  |  | 93,007,000-9 |  |  |  |  |  |
Company |  |  |  |  |  | SQM S.A. |  |  |  |  |  |
Country |  |  |  |  |  | Chile |  |  |  |  |  |
Number of registration or ID of the instrument |  |  |  |  |  | - |  |  |  |  |  |
Maturity date |  |  |  |  |  | 04/21/2018 |  |  |  |  |  |
Currency or adjustment index |  |  |  |  |  | US$ |  |  |  |  |  |
Payment of interest |  |  |  |  |  | Semiannual |  |  |  |  |  |
Repayment |  |  |  |  |  | Upon maturity |  |  |  |  |  |
Effective rate |  |  |  |  |  | 1.47% |  |  |  |  |  |
Nominal rate |  |  |  |  |  | 5.50% |  |  |  |  |  |
Notional Amount |  |  |  |  |  | $ 0 | 0 |  |  |  |  |
Non-current maturities |  |  |  |  |  |  | 250,000,000 |  |  |  |  |
Bond issuance costs |  |  |  |  |  | $ (385,000) | (904,000) |  |  |  |  |
Total |  |  |  |  |  |  | 249,096,000 |  |  |  |  |
Single series bond One [Member] | Over 1 year to 2 [member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  |  | 0 |  |  |  |  |
Non-current maturities |  |  |  |  |  |  | 0 |  |  |  |  |
Single series bond One [Member] | Over 2 years to 3 [member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  |  | 250,000,000 |  |  |  |  |
Non-current maturities |  |  |  |  |  |  | 250,000,000 |  |  |  |  |
Single series bond One [Member] | Over 3 Years to 4 [member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  |  | 0 |  |  |  |  |
Non-current maturities |  |  |  |  |  |  | 0 |  |  |  |  |
Single series bond One [Member] | Over 4 Years to 5 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  |  | 0 |  |  |  |  |
Non-current maturities |  |  |  |  |  |  | 0 |  |  |  |  |
Single series bond One [Member] | Over 5 years [member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  |  | 0 |  |  |  |  |
Non-current maturities |  |  |  |  |  |  | 0 |  |  |  |  |
Single series bond Two [Member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Tax ID |  |  |  |  |  | 93,007,000-9 |  |  |  |  |  |
Company |  |  |  |  |  | SQM S.A. |  |  |  |  |  |
Country |  |  |  |  |  | Chile |  |  |  |  |  |
Number of registration or ID of the instrument |  |  |  |  |  | - |  |  |  |  |  |
Maturity date |  |  |  |  |  | 01/28/2018 |  |  |  |  |  |
Currency or adjustment index |  |  |  |  |  | US$ |  |  |  |  |  |
Payment of interest |  |  |  |  |  | Semiannual |  |  |  |  |  |
Repayment |  |  |  |  |  | Upon maturity |  |  |  |  |  |
Effective rate |  |  |  |  |  | 3.17% |  |  |  |  |  |
Nominal rate |  |  |  |  |  | 4.38% |  |  |  |  |  |
Notional Amount |  |  |  |  |  | $ 0 | 0 |  |  |  |  |
Non-current maturities |  |  |  |  |  |  | 250,000,000 |  |  |  |  |
Bond issuance costs |  |  |  |  |  | $ (433,000) | (3,069,000) |  |  |  |  |
Total |  |  |  |  |  |  | 246,931,000 |  |  |  |  |
Single series bond Two [Member] | Over 1 year to 2 [member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  |  | 0 |  |  |  |  |
Non-current maturities |  |  |  |  |  |  | 0 |  |  |  |  |
Single series bond Two [Member] | Over 2 years to 3 [member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  |  | 0 |  |  |  |  |
Non-current maturities |  |  |  |  |  |  | 0 |  |  |  |  |
Single series bond Two [Member] | Over 3 Years to 4 [member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  |  | 0 |  |  |  |  |
Non-current maturities |  |  |  |  |  |  | 0 |  |  |  |  |
Single series bond Two [Member] | Over 4 Years to 5 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  |  | 0 |  |  |  |  |
Non-current maturities |  |  |  |  |  |  | 0 |  |  |  |  |
Single series bond Two [Member] | Over 5 years [member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  |  | 250,000,000 |  |  |  |  |
Non-current maturities |  |  |  |  |  |  | 250,000,000 |  |  |  |  |
Single series bond Three [Member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Tax ID |  |  |  |  |  | 93,007,000-9 |  |  |  |  |  |
Company |  |  |  |  |  | SQM S.A. |  |  |  |  |  |
Country |  |  |  |  |  | Chile |  |  |  |  |  |
Number of registration or ID of the instrument |  |  |  |  |  | - |  |  |  |  |  |
Maturity date |  |  |  |  |  | 0403//2018 |  |  |  |  |  |
Currency or adjustment index |  |  |  |  |  | US$ |  |  |  |  |  |
Payment of interest |  |  |  |  |  | Semiannual |  |  |  |  |  |
Repayment |  |  |  |  |  | Upon maturity |  |  |  |  |  |
Effective rate |  |  |  |  |  | 2.12% |  |  |  |  |  |
Nominal rate |  |  |  |  |  | 3.63% |  |  |  |  |  |
Notional Amount |  |  |  |  |  | $ 0 | 0 |  |  |  |  |
Non-current maturities |  |  |  |  |  |  | 300,000,000 |  |  |  |  |
Bond issuance costs |  |  |  |  |  | $ (615,000) | (3,230,000) |  |  |  |  |
Total |  |  |  |  |  |  | 296,770,000 |  |  |  |  |
Single series bond Three [Member] | Over 1 year to 2 [member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  |  | 0 |  |  |  |  |
Non-current maturities |  |  |  |  |  |  | 0 |  |  |  |  |
Single series bond Three [Member] | Over 2 years to 3 [member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  |  | 0 |  |  |  |  |
Non-current maturities |  |  |  |  |  |  | 0 |  |  |  |  |
Single series bond Three [Member] | Over 3 Years to 4 [member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  |  | 0 |  |  |  |  |
Non-current maturities |  |  |  |  |  |  | 0 |  |  |  |  |
Single series bond Three [Member] | Over 4 Years to 5 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  |  | 0 |  |  |  |  |
Non-current maturities |  |  |  |  |  |  | 0 |  |  |  |  |
Single series bond Three [Member] | Over 5 years [member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  |  | 300,000,000 |  |  |  |  |
Non-current maturities |  |  |  |  |  |  | 300,000,000 |  |  |  |  |
Series H bonds [Member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Tax ID |  |  |  |  |  | 93,007,000-9 |  |  |  |  |  |
Company |  |  |  |  |  | SQM S.A. |  |  |  |  |  |
Country |  |  |  |  |  | Chile |  |  |  |  |  |
Number of registration or ID of the instrument |  |  |  |  |  | 564 |  |  |  |  |  |
Maturity date |  |  |  |  |  | 01/05/2018 |  |  |  |  |  |
Currency or adjustment index |  |  |  |  |  | UF |  |  |  |  |  |
Payment of interest |  |  |  |  |  | Semiannual |  |  |  |  |  |
Repayment |  |  |  |  |  | Semiannual |  |  |  |  |  |
Effective rate |  |  |  |  |  | 2.18% |  |  |  |  |  |
Nominal rate |  |  |  |  |  | 4.90% |  |  |  |  |  |
Notional Amount |  |  |  |  |  | $ 0 | 0 |  |  |  |  |
Non-current maturities |  |  |  |  |  |  | 157,426,000 |  |  |  |  |
Bond issuance costs |  |  |  |  |  | $ (139,000) | (1,671,000) |  |  |  |  |
Total |  |  |  |  |  |  | 155,755,000 |  |  |  |  |
Series H bonds [Member] | Over 1 year to 2 [member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  |  | 0 |  |  |  |  |
Non-current maturities |  |  |  |  |  |  | 0 |  |  |  |  |
Series H bonds [Member] | Over 2 years to 3 [member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  |  | 0 |  |  |  |  |
Non-current maturities |  |  |  |  |  |  | 0 |  |  |  |  |
Series H bonds [Member] | Over 3 Years to 4 [member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  |  | 0 |  |  |  |  |
Non-current maturities |  |  |  |  |  |  | 0 |  |  |  |  |
Series H bonds [Member] | Over 4 Years to 5 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  |  | 0 |  |  |  |  |
Non-current maturities |  |  |  |  |  |  | 0 |  |  |  |  |
Series H bonds [Member] | Over 5 years [member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  |  | 157,426,000 |  |  |  |  |
Non-current maturities |  |  |  |  |  |  | 157,426,000 |  |  |  |  |
Series O bonds [Member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Tax ID |  |  |  |  |  | 93,007,000-9 |  |  |  |  |  |
Company |  |  |  |  |  | SQM S.A. |  |  |  |  |  |
Country |  |  |  |  |  | Chile |  |  |  |  |  |
Number of registration or ID of the instrument |  |  |  |  |  | 699 |  |  |  |  |  |
Maturity date |  |  |  |  |  | 02/01/2018 |  |  |  |  |  |
Currency or adjustment index |  |  |  |  |  | UF |  |  |  |  |  |
Payment of interest |  |  |  |  |  | Semiannual |  |  |  |  |  |
Repayment |  |  |  |  |  | Upon maturity |  |  |  |  |  |
Effective rate |  |  |  |  |  | 2.80% |  |  |  |  |  |
Nominal rate |  |  |  |  |  | 3.80% |  |  |  |  |  |
Notional Amount |  |  |  |  |  | $ 0 | 0 |  |  |  |  |
Non-current maturities |  |  |  |  |  |  | 59,035,000 |  |  |  |  |
Bond issuance costs |  |  |  |  |  | (67,000) | (1,012,000) |  |  |  |  |
Total |  |  |  |  |  |  | 58,023,000 |  |  |  |  |
Series O bonds [Member] | Over 1 year to 2 [member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  |  | 0 |  |  |  |  |
Non-current maturities |  |  |  |  |  |  | 0 |  |  |  |  |
Series O bonds [Member] | Over 2 years to 3 [member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  |  | 0 |  |  |  |  |
Non-current maturities |  |  |  |  |  |  | 0 |  |  |  |  |
Series O bonds [Member] | Over 3 Years to 4 [member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  |  | 0 |  |  |  |  |
Non-current maturities |  |  |  |  |  |  | 0 |  |  |  |  |
Series O bonds [Member] | Over 4 Years to 5 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  |  | 0 |  |  |  |  |
Non-current maturities |  |  |  |  |  |  | 0 |  |  |  |  |
Series O bonds [Member] | Over 5 years [member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  |  | 59,035,000 |  |  |  |  |
Non-current maturities |  |  |  |  |  |  | 59,035,000 |  |  |  |  |
Series C bonds [Member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  |  | 5,903,000 |  |  |  |  |
Non-current maturities |  |  |  |  |  |  | 53,131,000 |  |  |  |  |
Bond issuance costs |  |  |  |  |  |  | 0 |  |  |  |  |
Total |  |  |  |  |  |  | 53,131,000 |  |  |  |  |
Series C bonds [Member] | Over 1 year to 2 [member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  |  | 5,903,000 |  |  |  |  |
Non-current maturities |  |  |  |  |  |  | 5,903,000 |  |  |  |  |
Series C bonds [Member] | Over 2 years to 3 [member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  |  | 5,903,000 |  |  |  |  |
Non-current maturities |  |  |  |  |  |  | 5,903,000 |  |  |  |  |
Series C bonds [Member] | Over 3 Years to 4 [member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  |  | 5,903,000 |  |  |  |  |
Non-current maturities |  |  |  |  |  |  | 5,903,000 |  |  |  |  |
Series C bonds [Member] | Over 4 Years to 5 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  |  | 5,903,000 |  |  |  |  |
Non-current maturities |  |  |  |  |  |  | 5,903,000 |  |  |  |  |
Series C bonds [Member] | Over 5 years [member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  |  | 29,519,000 |  |  |  |  |
Non-current maturities |  |  |  |  |  |  | $ 29,519,000 |  |  |  |  |
Bonds issued [Member] | Single series bond One [Member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  | 10 |  |  |  |  |  |  |
Effective rate |  |  |  |  | 5.50% |  |  |  |  |  |  |
Notional Amount |  |  |  |  | $ 250,000,000 |  |  |  |  |  |  |
Bonds issued [Member] | Single series bond Two [Member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  | 2025 |  |  |  |  |  |  |  |
Effective rate |  |  |  | 4.375% |  |  |  |  |  |  |  |
Notional Amount |  |  |  | $ 250,000,000 |  |  |  |  |  |  |  |
Bonds issued [Member] | Single series bond Three [Member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maturity date | 10 |  |  |  |  |  |  |  |  |  |  |
Effective rate | 3.625% |  |  |  |  |  |  |  |  |  |  |
Notional Amount | $ 300,000 |  |  |  |  |  |  |  |  |  |  |
Bonds issued [Member] | Series H bonds [Member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maturity date |  |  | 21 |  |  |  |  |  |  |  |  |
Effective rate |  |  | 4.90% |  |  |  |  |  |  | 4.90% |  |
Notional Amount |  |  | $ 139,216,000 |  |  |  |  |  |  | 4,000,000 |  |
Bonds issued [Member] | Series O bonds [Member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maturity date |  | 21 |  |  |  |  |  |  |  |  |  |
Effective rate |  | 3.80% |  |  |  |  |  |  | 3.80% |  |  |
Notional Amount |  | $ 69,901 |  |  |  |  |  |  | 1,500,000 |  |  |
Bonds issued [Member] | Series C bonds [Member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Effective rate |  |  |  |  |  |  |  |  |  |  | 4.00% | 4.00%
Notional Amount |  |  |  |  |  |  |  |  |  |  | $ 101,918,000 | 3,000,000
Non current bonds issued [Member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  | 1,039,755,000 |  |  |  |  |  |
Non-current maturities |  |  |  |  |  | 1,039,755,000 |  |  |  |  |  |
Bond issuance costs |  |  |  |  |  | (8,248,000) |  |  |  |  |  |
Total |  |  |  |  |  | 1,031,507,000 |  |  |  |  |  |
Non current bonds issued [Member] | Over 1 year to 2 [member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  | 250,000,000 |  |  |  |  |  |
Non-current maturities |  |  |  |  |  | 250,000,000 |  |  |  |  |  |
Non current bonds issued [Member] | Over 2 years to 3 [member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  | 0 |  |  |  |  |  |
Non-current maturities |  |  |  |  |  | 0 |  |  |  |  |  |
Non current bonds issued [Member] | Over 3 Years to 4 [member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  | 0 |  |  |  |  |  |
Non-current maturities |  |  |  |  |  | 0 |  |  |  |  |  |
Non current bonds issued [Member] | Over 4 Years to 5 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  | 789,755,000 |  |  |  |  |  |
Non-current maturities |  |  |  |  |  | 789,755,000 |  |  |  |  |  |
Non current bonds issued [Member] | Over 5 years [member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  | 0 |  |  |  |  |  |
Non-current maturities |  |  |  |  |  | $ 0 |  |  |  |  |  |
Non current bonds issued [Member] | Single series bond One [Member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Tax ID |  |  |  |  |  | 93,007,000-9 | 93,007,000-9 |  |  |  |  |
Company |  |  |  |  |  | SQM S.A. | SQM S.A. |  |  |  |  |
Country |  |  |  |  |  | Chile | Chile |  |  |  |  |
Number of registration or ID of the instrument |  |  |  |  |  | - | - |  |  |  |  |
Maturity date |  |  |  |  |  | 04/21/2020 | 04/21/2020 |  |  |  |  |
Currency or adjustment index |  |  |  |  |  | US$ | US$ |  |  |  |  |
Payment of interest |  |  |  |  |  | Semiannual | Semiannual |  |  |  |  |
Repayment |  |  |  |  |  | Upon maturity | Upon maturity |  |  |  |  |
Effective rate |  |  |  |  |  | 5.50% | 5.94% |  |  |  |  |
Nominal rate |  |  |  |  |  | 5.50% | 5.50% |  |  |  |  |
Notional Amount |  |  |  |  |  | $ 250,000,000 |  |  |  |  |  |
Non-current maturities |  |  |  |  |  | 250,000,000 |  |  |  |  |  |
Bond issuance costs |  |  |  |  |  | (517,000) |  |  |  |  |  |
Total |  |  |  |  |  | 249,483,000 |  |  |  |  |  |
Non current bonds issued [Member] | Single series bond One [Member] | Over 1 year to 2 [member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  | 250,000,000 |  |  |  |  |  |
Non-current maturities |  |  |  |  |  | 250,000,000 |  |  |  |  |  |
Non current bonds issued [Member] | Single series bond One [Member] | Over 2 years to 3 [member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  | 0 |  |  |  |  |  |
Non-current maturities |  |  |  |  |  | 0 |  |  |  |  |  |
Non current bonds issued [Member] | Single series bond One [Member] | Over 3 Years to 4 [member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  | 0 |  |  |  |  |  |
Non-current maturities |  |  |  |  |  | 0 |  |  |  |  |  |
Non current bonds issued [Member] | Single series bond One [Member] | Over 4 Years to 5 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  | 0 |  |  |  |  |  |
Non-current maturities |  |  |  |  |  | 0 |  |  |  |  |  |
Non current bonds issued [Member] | Single series bond One [Member] | Over 5 years [member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  | 0 |  |  |  |  |  |
Non-current maturities |  |  |  |  |  | $ 0 |  |  |  |  |  |
Non current bonds issued [Member] | Single series bond Two [Member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Tax ID |  |  |  |  |  | 93,007,000-9 | 93,007,000-9 |  |  |  |  |
Company |  |  |  |  |  | SQM S.A. | SQM S.A. |  |  |  |  |
Country |  |  |  |  |  | Chile | Chile |  |  |  |  |
Number of registration or ID of the instrument |  |  |  |  |  | - | - |  |  |  |  |
Maturity date |  |  |  |  |  | 01/28/2025 | 01/28/2025 |  |  |  |  |
Currency or adjustment index |  |  |  |  |  | US$ | US$ |  |  |  |  |
Payment of interest |  |  |  |  |  | Semiannual | Semiannual |  |  |  |  |
Repayment |  |  |  |  |  | Upon maturity | Upon maturity |  |  |  |  |
Effective rate |  |  |  |  |  | 4.38% | 4.62% |  |  |  |  |
Nominal rate |  |  |  |  |  | 4.38% | 4.38% |  |  |  |  |
Notional Amount |  |  |  |  |  | $ 250,000,000 |  |  |  |  |  |
Non-current maturities |  |  |  |  |  | 250,000,000 |  |  |  |  |  |
Bond issuance costs |  |  |  |  |  | (2,636,000) |  |  |  |  |  |
Total |  |  |  |  |  | 247,364,000 |  |  |  |  |  |
Non current bonds issued [Member] | Single series bond Two [Member] | Over 1 year to 2 [member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  | 0 |  |  |  |  |  |
Non-current maturities |  |  |  |  |  | 0 |  |  |  |  |  |
Non current bonds issued [Member] | Single series bond Two [Member] | Over 2 years to 3 [member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  | 0 |  |  |  |  |  |
Non-current maturities |  |  |  |  |  | 0 |  |  |  |  |  |
Non current bonds issued [Member] | Single series bond Two [Member] | Over 3 Years to 4 [member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  | 0 |  |  |  |  |  |
Non-current maturities |  |  |  |  |  | 0 |  |  |  |  |  |
Non current bonds issued [Member] | Single series bond Two [Member] | Over 4 Years to 5 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  | 250,000,000 |  |  |  |  |  |
Non-current maturities |  |  |  |  |  | 250,000,000 |  |  |  |  |  |
Non current bonds issued [Member] | Single series bond Two [Member] | Over 5 years [member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  | 0 |  |  |  |  |  |
Non-current maturities |  |  |  |  |  | $ 0 |  |  |  |  |  |
Non current bonds issued [Member] | Single series bond Three [Member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Tax ID |  |  |  |  |  | 93,007,000-9 | 93,007,000-9 |  |  |  |  |
Company |  |  |  |  |  | SQM S.A. | SQM S.A. |  |  |  |  |
Country |  |  |  |  |  | Chile | Chile |  |  |  |  |
Number of registration or ID of the instrument |  |  |  |  |  | - | - |  |  |  |  |
Maturity date |  |  |  |  |  | 04/03/2023 | 04/03/2023 |  |  |  |  |
Currency or adjustment index |  |  |  |  |  | US$ | US$ |  |  |  |  |
Payment of interest |  |  |  |  |  | Semiannual | Semiannual |  |  |  |  |
Repayment |  |  |  |  |  | Upon maturity | Upon maturity |  |  |  |  |
Effective rate |  |  |  |  |  | 3.63% | 3.95% |  |  |  |  |
Nominal rate |  |  |  |  |  | 3.63% | 3.63% |  |  |  |  |
Notional Amount |  |  |  |  |  | $ 300,000,000 |  |  |  |  |  |
Non-current maturities |  |  |  |  |  | 300,000,000 |  |  |  |  |  |
Bond issuance costs |  |  |  |  |  | (2,618,000) |  |  |  |  |  |
Total |  |  |  |  |  | 297,382,000 |  |  |  |  |  |
Non current bonds issued [Member] | Single series bond Three [Member] | Over 1 year to 2 [member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  | 0 |  |  |  |  |  |
Non-current maturities |  |  |  |  |  | 0 |  |  |  |  |  |
Non current bonds issued [Member] | Single series bond Three [Member] | Over 2 years to 3 [member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  | 0 |  |  |  |  |  |
Non-current maturities |  |  |  |  |  | 0 |  |  |  |  |  |
Non current bonds issued [Member] | Single series bond Three [Member] | Over 3 Years to 4 [member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  | 0 |  |  |  |  |  |
Non-current maturities |  |  |  |  |  | 0 |  |  |  |  |  |
Non current bonds issued [Member] | Single series bond Three [Member] | Over 4 Years to 5 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  | 300,000,000 |  |  |  |  |  |
Non-current maturities |  |  |  |  |  | 300,000,000 |  |  |  |  |  |
Non current bonds issued [Member] | Single series bond Three [Member] | Over 5 years [member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  | 0 |  |  |  |  |  |
Non-current maturities |  |  |  |  |  | $ 0 |  |  |  |  |  |
Non current bonds issued [Member] | Series H bonds [Member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Tax ID |  |  |  |  |  | 93,007,000-9 | 93,007,000-9 |  |  |  |  |
Company |  |  |  |  |  | SQM S.A. | SQM S.A. |  |  |  |  |
Country |  |  |  |  |  | Chile | Chile |  |  |  |  |
Number of registration or ID of the instrument |  |  |  |  |  | 564 | 564 |  |  |  |  |
Maturity date |  |  |  |  |  | 01/05/2030 | 01/05/2030 |  |  |  |  |
Currency or adjustment index |  |  |  |  |  | UF | UF |  |  |  |  |
Payment of interest |  |  |  |  |  | Semiannual | Semiannual |  |  |  |  |
Repayment |  |  |  |  |  | Semiannual | Semiannual |  |  |  |  |
Effective rate |  |  |  |  |  | 4.90% | 5.22% |  |  |  |  |
Nominal rate |  |  |  |  |  | 6.01% | 4.90% |  |  |  |  |
Notional Amount |  |  |  |  |  | $ 174,367,000 |  |  |  |  |  |
Non-current maturities |  |  |  |  |  | 174,367,000 |  |  |  |  |  |
Bond issuance costs |  |  |  |  |  | (1,532,000) |  |  |  |  |  |
Total |  |  |  |  |  | 172,835,000 |  |  |  |  |  |
Non current bonds issued [Member] | Series H bonds [Member] | Over 1 year to 2 [member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  | 0 |  |  |  |  |  |
Non-current maturities |  |  |  |  |  | 0 |  |  |  |  |  |
Non current bonds issued [Member] | Series H bonds [Member] | Over 2 years to 3 [member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  | 0 |  |  |  |  |  |
Non-current maturities |  |  |  |  |  | 0 |  |  |  |  |  |
Non current bonds issued [Member] | Series H bonds [Member] | Over 3 Years to 4 [member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  | 0 |  |  |  |  |  |
Non-current maturities |  |  |  |  |  | 0 |  |  |  |  |  |
Non current bonds issued [Member] | Series H bonds [Member] | Over 4 Years to 5 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  | 174,367,000 |  |  |  |  |  |
Non-current maturities |  |  |  |  |  | 174,367,000 |  |  |  |  |  |
Non current bonds issued [Member] | Series H bonds [Member] | Over 5 years [member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  | 0 |  |  |  |  |  |
Non-current maturities |  |  |  |  |  | $ 0 |  |  |  |  |  |
Non current bonds issued [Member] | Series O bonds [Member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Tax ID |  |  |  |  |  | 93,007,000-9 | 93,007,000-9 |  |  |  |  |
Company |  |  |  |  |  | SQM S.A. | SQM S.A. |  |  |  |  |
Country |  |  |  |  |  | Chile | Chile |  |  |  |  |
Number of registration or ID of the instrument |  |  |  |  |  | 699 | 699 |  |  |  |  |
Maturity date |  |  |  |  |  | 02/01/2033 | 02/01/2033 |  |  |  |  |
Currency or adjustment index |  |  |  |  |  | UF | UF |  |  |  |  |
Payment of interest |  |  |  |  |  | Semiannual | Semiannual |  |  |  |  |
Repayment |  |  |  |  |  | Upon maturity | Upon maturity |  |  |  |  |
Effective rate |  |  |  |  |  | 3.80% | 3.97% |  |  |  |  |
Nominal rate |  |  |  |  |  | 3.80% | 3.80% |  |  |  |  |
Notional Amount |  |  |  |  |  | $ 65,388,000 |  |  |  |  |  |
Non-current maturities |  |  |  |  |  | 65,388,000 |  |  |  |  |  |
Bond issuance costs |  |  |  |  |  | (945,000) |  |  |  |  |  |
Total |  |  |  |  |  | 64,443,000 |  |  |  |  |  |
Non current bonds issued [Member] | Series O bonds [Member] | Over 1 year to 2 [member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  | 0 |  |  |  |  |  |
Non-current maturities |  |  |  |  |  | 0 |  |  |  |  |  |
Non current bonds issued [Member] | Series O bonds [Member] | Over 2 years to 3 [member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  | 0 |  |  |  |  |  |
Non-current maturities |  |  |  |  |  | 0 |  |  |  |  |  |
Non current bonds issued [Member] | Series O bonds [Member] | Over 3 Years to 4 [member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  | 0 |  |  |  |  |  |
Non-current maturities |  |  |  |  |  | 0 |  |  |  |  |  |
Non current bonds issued [Member] | Series O bonds [Member] | Over 4 Years to 5 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  | 65,388,000 |  |  |  |  |  |
Non-current maturities |  |  |  |  |  | 65,388,000 |  |  |  |  |  |
Non current bonds issued [Member] | Series O bonds [Member] | Over 5 years [member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  | 0 |  |  |  |  |  |
Non-current maturities |  |  |  |  |  | $ 0 |  |  |  |  |  |
Non current bonds issued [Member] | Series C bonds [Member] |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Tax ID |  |  |  |  |  |  | 93,007,000-9 |  |  |  |  |
Company |  |  |  |  |  |  | SQM S.A. |  |  |  |  |
Country |  |  |  |  |  |  | Chile |  |  |  |  |
Number of registration or ID of the instrument |  |  |  |  |  |  | 446 |  |  |  |  |
Maturity date |  |  |  |  |  |  | 12/01/2026 |  |  |  |  |
Currency or adjustment index |  |  |  |  |  |  | UF |  |  |  |  |
Payment of interest |  |  |  |  |  |  | Semiannual |  |  |  |  |
Repayment |  |  |  |  |  |  | Semiannual |  |  |  |  |
Effective rate |  |  |  |  |  |  | 5.57% |  |  |  |  |
Nominal rate |  |  |  |  |  |  | 4.00% |  |  |  |  |

X
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