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Financial risk management (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Financial risk management [Line Items] |  |
Financial assets | $ 291,790 | $ 163,269
Financial Assets Neither Past Due Nor Impaired Total [Member] |  |
Financial risk management [Line Items] |  |
Financial assets | 367,361 | 578,711
Moody´s P-1 SPA-2 [Member] | Itau-Corpbanca [Member] | Financial assets neither past due nor impaired [member] |  |
Financial risk management [Line Items] |  |
Financial assets |  | 77,526
Moody´s P-1 SPA-1 [Member] | Banco Credito e Inversiones [Member] | Financial assets neither past due nor impaired [member] |  |
Financial risk management [Line Items] |  |
Financial assets | 145,834 |
Moody´s P-1 SPA-1 [Member] | Banco Santander - Santiago [Member] | Financial assets neither past due nor impaired [member] |  |
Financial risk management [Line Items] |  |
Financial assets | 23,124 |
Moody´s P-1 SPA-1 [Member] | Time deposits [Member] | Banco Credito e Inversiones [Member] | Financial assets neither past due nor impaired [member] |  |
Financial risk management [Line Items] |  |
Financial assets | 27,428 |
Moody´s P-1 SPA-1 [Member] | Time deposits [Member] | Banco de Chile [Member] | Financial assets neither past due nor impaired [member] |  |
Financial risk management [Line Items] |  |
Financial assets | 7,305 |
Moody´s P-1 SPA-1 [Member] | Time deposits [Member] | Itau-Corpbanca [Member] | Financial assets neither past due nor impaired [member] |  |
Financial risk management [Line Items] |  |
Financial assets | 61,946 |
Moodys P1 SPA1 FitchF1 [Member] | Banco Credito e Inversiones [Member] | Financial assets neither past due nor impaired [member] |  |
Financial risk management [Line Items] |  |
Financial assets |  | 71,748
Moodys P1 SPA1 FitchF1 [Member] | Banco Santander - Santiago [Member] | Financial assets neither past due nor impaired [member] |  |
Financial risk management [Line Items] |  |
Financial assets |  | 163,269
Moodys P1 SPA1 FitchF1 [Member] | Time deposits [Member] | Banco Credito e Inversiones [Member] | Financial assets neither past due nor impaired [member] |  |
Financial risk management [Line Items] |  |
Financial assets |  | 120,616
Moodys P1 SPA1 FitchF1 [Member] | Time deposits [Member] | Banco Santander - Santiago [Member] | Financial assets neither past due nor impaired [member] |  |
Financial risk management [Line Items] |  |
Financial assets |  | 35,558
No Rating [Member] | Banco BBVA Chile [Member] | Financial assets neither past due nor impaired [member] |  |
Financial risk management [Line Items] |  |
Financial assets |  | 1,207
No Rating [Member] | Banco de Chile [Member] | Financial assets neither past due nor impaired [member] |  |
Financial risk management [Line Items] |  |
Financial assets |  | 4,834
No Rating [Member] | Banco Security [Member] | Financial assets neither past due nor impaired [member] |  |
Financial risk management [Line Items] |  |
Financial assets | 27,215 | 28,592
No Rating [Member] | Banco Sud Americano [Member] | Financial assets neither past due nor impaired [member] |  |
Financial risk management [Line Items] |  |
Financial assets | 24,898 |
No Rating [Member] | Time deposits [Member] | Banco Santander - Santiago [Member] | Financial assets neither past due nor impaired [member] |  |
Financial risk management [Line Items] |  |
Financial assets | 432 |
No Rating [Member] | Time deposits [Member] | BBVA Banco Frances [Member] | Financial assets neither past due nor impaired [member] |  |
Financial risk management [Line Items] |  |
Financial assets | 84 | 163
No Rating [Member] | Time deposits [Member] | Scotiabank Sud Americano [Member] | Financial assets neither past due nor impaired [member] |  |
Financial risk management [Line Items] |  |
Financial assets |  | 12,520
No Rating [Member] | Time deposits [Member] | ABN Armo Bank [Member] | Financial assets neither past due nor impaired [member] |  |
Financial risk management [Line Items] |  |
Financial assets |  | 1,439
No Rating [Member] | Time deposits [Member] | Banco Estado [Member] | Financial assets neither past due nor impaired [member] |  |
Financial risk management [Line Items] |  |
Financial assets | 3,602 |
No Rating [Member] | Investment Fund Deposits [Member] | JP Morgan US dollar Liquidity Fund Institutional [Member] | Financial assets neither past due nor impaired [member] |  |
Financial risk management [Line Items] |  |
Financial assets | 133,809 | 143,333
No Rating [Member] | Investment Fund Deposits [Member] | Legg Mason - Western Asset Institutional Cash Reserves [Member] | Financial assets neither past due nor impaired [member] |  |
Financial risk management [Line Items] |  |
Financial assets | 132,108 |
Moody´s P-2 SPA-2 [Member] | Itau-Corpbanca [Member] | Financial assets neither past due nor impaired [member] |  |
Financial risk management [Line Items] |  |
Financial assets | 70,719 |
Moody´s P-2 SPA-2 [Member] | Banco Security [Member] | Financial assets neither past due nor impaired [member] |  |
Financial risk management [Line Items] |  |
Financial assets |  | 4,191
Moody´s P-2 SPA-2 [Member] | Time deposits [Member] | Banco BBVA Chile [Member] | Financial assets neither past due nor impaired [member] |  |
Financial risk management [Line Items] |  |
Financial assets |  | 41,860
Moody´s P-2 SPA-2 [Member] | Time deposits [Member] | Itau-Corpbanca [Member] | Financial assets neither past due nor impaired [member] |  |
Financial risk management [Line Items] |  |
Financial assets |  | 75,072
Moody´s P-1 SPB [Member] | Time deposits [Member] | Nedbank [Member] | Financial assets neither past due nor impaired [member] |  |
Financial risk management [Line Items] |  |
Financial assets | $ 647 | 3,686
FitchAA [Member] |  |
Financial risk management [Line Items] |  |
Financial assets |  | $ 13,765

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