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Identification and Activities of the Company and Subsidiaries (Details 1) - shares | Dec. 31, 2017 | Dec. 31, 2016
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The Bank of New York Mellon, ADRs [Member] |  |
Identification and Activities of the Company and Subsidiaries [Line Items] |  |
Number of Shares Outstanding, Ownership Percentage | 20.74% | 22.56%
Sociedad de Inversiones Pampa Calichera S.A. [Member] |  |
Identification and Activities of the Company and Subsidiaries [Line Items] |  |
Number of Shares Outstanding, Ownership Percentage | 19.72% | 19.72%
Inversiones El Boldo Limitada [Member] |  |
Identification and Activities of the Company and Subsidiaries [Line Items] |  |
Number of Shares Outstanding, Ownership Percentage | 17.36% | 17.36%
Inversiones RAC Chile Limitada [Member] |  |
Identification and Activities of the Company and Subsidiaries [Line Items] |  |
Number of Shares Outstanding, Ownership Percentage | 8.13% | 8.13%
Potasios de Chile S.A. [Member] |  |
Identification and Activities of the Company and Subsidiaries [Line Items] |  |
Number of Shares Outstanding, Ownership Percentage | 6.91% | 6.91%
Inversiones PCS Chile Limitada [Member] |  |
Identification and Activities of the Company and Subsidiaries [Line Items] |  |
Number of Shares Outstanding, Ownership Percentage | 6.51% | 6.51%
Inversiones Global Mining Chile Limitada [Member] |  |
Identification and Activities of the Company and Subsidiaries [Line Items] |  |
Number of Shares Outstanding, Ownership Percentage | 3.34% | 3.34%
Banco de Chile por Cuenta de Terceros no Residentes [Member] |  |
Identification and Activities of the Company and Subsidiaries [Line Items] |  |
Number of Shares Outstanding, Ownership Percentage | 3.19% |
Banco Itau por Cuenta de Inversionistas [Member] |  |
Identification and Activities of the Company and Subsidiaries [Line Items] |  |
Number of Shares Outstanding, Ownership Percentage | 2.67% |
Banco Santander por cuenta de inversionistas extranjeros [Member] |  |
Identification and Activities of the Company and Subsidiaries [Line Items] |  |
Number of Shares Outstanding, Ownership Percentage | 1.75% |
Banco de Chile on behalf of non-resident third parties [Member] |  |
Identification and Activities of the Company and Subsidiaries [Line Items] |  |
Number of Shares Outstanding, Ownership Percentage |  | 3.41%
Banco Itau on behalf of investors [Member] |  |
Identification and Activities of the Company and Subsidiaries [Line Items] |  |
Number of Shares Outstanding, Ownership Percentage |  | 2.48%
Inversiones La Esperanza Limitada [Member] |  |
Identification and Activities of the Company and Subsidiaries [Line Items] |  |
Number of Shares Outstanding, Ownership Percentage |  | 1.43%
Series A Stock [Member] | The Bank of New York Mellon, ADRs [Member] |  |
Identification and Activities of the Company and Subsidiaries [Line Items] |  |
Number of shares outstanding | 0 | 0
Number of Shares Outstanding, Ownership Percentage | 0.00% | 0.00%
Series A Stock [Member] | Sociedad de Inversiones Pampa Calichera S.A. [Member] |  |
Identification and Activities of the Company and Subsidiaries [Line Items] |  |
Number of shares outstanding | 44,894,152 | 44,894,152
Number of Shares Outstanding, Ownership Percentage | 31.43% | 31.43%
Series A Stock [Member] | Inversiones El Boldo Limitada [Member] |  |
Identification and Activities of the Company and Subsidiaries [Line Items] |  |
Number of shares outstanding | 29,330,326 | 29,330,326
Number of Shares Outstanding, Ownership Percentage | 20.54% | 20.54%
Series A Stock [Member] | Inversiones RAC Chile Limitada [Member] |  |
Identification and Activities of the Company and Subsidiaries [Line Items] |  |
Number of shares outstanding | 19,200,242 | 19,200,242
Number of Shares Outstanding, Ownership Percentage | 13.44% | 13.44%
Series A Stock [Member] | Potasios de Chile S.A. [Member] |  |
Identification and Activities of the Company and Subsidiaries [Line Items] |  |
Number of shares outstanding | 18,179,147 | 18,179,147
Number of Shares Outstanding, Ownership Percentage | 12.73% | 12.73%
Series A Stock [Member] | Inversiones PCS Chile Limitada [Member] |  |
Identification and Activities of the Company and Subsidiaries [Line Items] |  |
Number of shares outstanding | 15,526,000 | 15,526,000
Number of Shares Outstanding, Ownership Percentage | 10.87% | 10.87%
Series A Stock [Member] | Inversiones Global Mining Chile Limitada [Member] |  |
Identification and Activities of the Company and Subsidiaries [Line Items] |  |
Number of shares outstanding | 8,798,539 | 8,798,539
Number of Shares Outstanding, Ownership Percentage | 6.16% | 6.16%
Series A Stock [Member] | Banco de Chile por Cuenta de Terceros no Residentes [Member] |  |
Identification and Activities of the Company and Subsidiaries [Line Items] |  |
Number of shares outstanding | 0 |
Number of Shares Outstanding, Ownership Percentage | 0.00% |
Series A Stock [Member] | Banco Itau por Cuenta de Inversionistas [Member] |  |
Identification and Activities of the Company and Subsidiaries [Line Items] |  |
Number of shares outstanding | 19,125 |
Number of Shares Outstanding, Ownership Percentage | 0.01% |
Series A Stock [Member] | Banco Santander por cuenta de inversionistas extranjeros [Member] |  |
Identification and Activities of the Company and Subsidiaries [Line Items] |  |
Number of shares outstanding | 0 |
Number of Shares Outstanding, Ownership Percentage | 0.00% |
Series A Stock [Member] | Banco de Chile on behalf of non-resident third parties [Member] |  |
Identification and Activities of the Company and Subsidiaries [Line Items] |  |
Number of shares outstanding |  | 0
Number of Shares Outstanding, Ownership Percentage |  | 0.00%
Series A Stock [Member] | Banco Itau on behalf of investors [Member] |  |
Identification and Activities of the Company and Subsidiaries [Line Items] |  |
Number of shares outstanding |  | 20,950
Number of Shares Outstanding, Ownership Percentage |  | 0.01%
Series A Stock [Member] | Inversiones La Esperanza Limitada [Member] |  |
Identification and Activities of the Company and Subsidiaries [Line Items] |  |
Number of shares outstanding |  | 3,711,598
Number of Shares Outstanding, Ownership Percentage |  | 2.60%
Series B Stock [Member] | The Bank of New York Mellon, ADRs [Member] |  |
Identification and Activities of the Company and Subsidiaries [Line Items] |  |
Number of shares outstanding | 54,599,961 | 59,373,011
Number of Shares Outstanding, Ownership Percentage | 45.36% | 49.32%
Series B Stock [Member] | Sociedad de Inversiones Pampa Calichera S.A. [Member] |  |
Identification and Activities of the Company and Subsidiaries [Line Items] |  |
Number of shares outstanding | 7,007,688 | 7,007,688
Number of Shares Outstanding, Ownership Percentage | 5.82% | 5.82%
Series B Stock [Member] | Inversiones El Boldo Limitada [Member] |  |
Identification and Activities of the Company and Subsidiaries [Line Items] |  |
Number of shares outstanding | 16,363,546 | 16,363,546
Number of Shares Outstanding, Ownership Percentage | 13.59% | 13.59%
Series B Stock [Member] | Inversiones RAC Chile Limitada [Member] |  |
Identification and Activities of the Company and Subsidiaries [Line Items] |  |
Number of shares outstanding | 2,202,773 | 2,202,773
Number of Shares Outstanding, Ownership Percentage | 1.83% | 1.83%
Series B Stock [Member] | Potasios de Chile S.A. [Member] |  |
Identification and Activities of the Company and Subsidiaries [Line Items] |  |
Number of shares outstanding | 0 | 0
Number of Shares Outstanding, Ownership Percentage | 0.00% | 0.00%
Series B Stock [Member] | Inversiones PCS Chile Limitada [Member] |  |
Identification and Activities of the Company and Subsidiaries [Line Items] |  |
Number of shares outstanding | 1,600,000 | 1,600,000
Number of Shares Outstanding, Ownership Percentage | 1.33% | 1.33%
Series B Stock [Member] | Inversiones Global Mining Chile Limitada [Member] |  |
Identification and Activities of the Company and Subsidiaries [Line Items] |  |
Number of shares outstanding | 0 | 0
Number of Shares Outstanding, Ownership Percentage | 0.00% | 0.00%
Series B Stock [Member] | Banco de Chile por Cuenta de Terceros no Residentes [Member] |  |
Identification and Activities of the Company and Subsidiaries [Line Items] |  |
Number of shares outstanding | 8,394,289 |
Number of Shares Outstanding, Ownership Percentage | 6.97% |
Series B Stock [Member] | Banco Itau por Cuenta de Inversionistas [Member] |  |
Identification and Activities of the Company and Subsidiaries [Line Items] |  |
Number of shares outstanding | 7,017,504 |
Number of Shares Outstanding, Ownership Percentage | 5.63% |
Series B Stock [Member] | Banco Santander por cuenta de inversionistas extranjeros [Member] |  |
Identification and Activities of the Company and Subsidiaries [Line Items] |  |
Number of shares outstanding | 4,593,336 |
Number of Shares Outstanding, Ownership Percentage | 3.82% |
Series B Stock [Member] | Banco de Chile on behalf of non-resident third parties [Member] |  |
Identification and Activities of the Company and Subsidiaries [Line Items] |  |
Number of shares outstanding |  | 8,962,355
Number of Shares Outstanding, Ownership Percentage |  | 7.45%
Series B Stock [Member] | Banco Itau on behalf of investors [Member] |  |
Identification and Activities of the Company and Subsidiaries [Line Items] |  |
Number of shares outstanding |  | 6,502,217
Number of Shares Outstanding, Ownership Percentage |  | 5.40%
Series B Stock [Member] | Inversiones La Esperanza Limitada [Member] |  |
Identification and Activities of the Company and Subsidiaries [Line Items] |  |
Number of shares outstanding |  | 46,500
Number of Shares Outstanding, Ownership Percentage |  | 0.04%

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