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Financial instruments (Details Textual) |  |  |  |  |  | 1 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
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Nov. 08, 2018 USD ($) | Apr. 05, 2018 USD ($) | Apr. 03, 2013 USD ($) | Apr. 04, 2012 USD ($) | Jan. 13, 2009 USD ($) | Oct. 31, 2018 USD ($) | Oct. 23, 2014 USD ($) | Apr. 21, 2010 USD ($) | Sep. 30, 2018 | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Apr. 04, 2012 CLF ( ) | Jan. 13, 2009 CLF ( ) | Jan. 24, 2006 USD ($) | Jan. 24, 2006 CLF ( )
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term deposits, maturity |  |  |  |  |  |  |  |  | greater than 90 days and less than 360 days |  |  |  |  |  |
Current bonds issued net of issuance costs |  |  |  |  |  |  |  |  |  | $ 15,145,000 | $ 13,494,000 |  |  |  |
Non current bonds issued net of issuance costs |  |  |  |  |  |  |  |  |  | 68,870,000 | 1,031,507,000 |  |  |  |
Notional amount |  |  |  |  |  |  |  |  |  | 16,796,000 | 1,039,755,000 |  |  |  |
Borrowings, maturity |  |  |  |  |  | 2038 |  |  |  |  |  |  |  |  |
Outstanding purchase commitments |  |  |  |  |  |  |  |  |  | 59,919,000 | 41,601,000 |  |  |  |
Single series bond One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current bonds issued net of issuance costs |  |  |  |  |  |  |  |  |  | 2,288,000 |  |  |  |  |
Non current bonds issued net of issuance costs |  |  |  |  |  |  |  |  |  |  | 249,483,000 |  |  |  |
Notional amount |  |  |  |  |  |  |  |  |  | $ 2,674,000 | $ 250,000,000 |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  |  |  | 0.95% | 5.50% |  |  |  |
Borrowings, maturity |  |  |  |  |  |  |  |  |  | 4/21/2019 | 04/21/2020 |  |  |  |
Single series bond One [Member] | Bonds issued [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  | $ 250,000 |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  | 5.50% |  |  |  |  |  |  |
Borrowings, maturity |  |  |  |  |  |  |  | 10 |  |  |  |  |  |  |
Single series bond Three [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current bonds issued net of issuance costs |  |  |  |  |  |  |  |  |  | $ 2,044,000 |  |  |  |  |
Non current bonds issued net of issuance costs |  |  |  |  |  |  |  |  |  |  | $ 297,382,000 |  |  |  |
Notional amount |  |  |  |  |  |  |  |  |  | $ 2,658,000 | $ 300,000,000 |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  |  |  | 177.00% | 3.63% |  |  |  |
Borrowings, maturity |  |  |  |  |  |  |  |  |  | 4/03/2019 | 04/03/2023 |  |  |  |
Single series bond Three [Member] | Bonds issued [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  | $ 300 |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  | 3.625% |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, maturity |  |  | 10 |  |  |  |  |  |  |  |  |  |  |  |
Annual yield rate |  |  | 3.716% |  |  |  |  |  |  |  |  |  |  |  |
Description of difference between the annual interest rate and comparable rate with treasury bonds |  |  | This rate equates to a difference of 180 basis points to comparable US Treasury bonds |  |  |  |  |  |  |  |  |  |  |  |
Single series bond Two [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current bonds issued net of issuance costs |  |  |  |  |  |  |  |  |  | $ 4,215,000 |  |  |  |  |
Non current bonds issued net of issuance costs |  |  |  |  |  |  |  |  |  |  | $ 247,364,000 |  |  |  |
Notional amount |  |  |  |  |  |  |  |  |  | $ 4,648,000 | $ 250,000,000 |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  |  |  | 275.00% | 4.38% |  |  |  |
Borrowings, maturity |  |  |  |  |  |  |  |  |  | 1/28/2019 | 01/28/2025 |  |  |  |
Single series bond Two [Member] | Bonds issued [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  | $ 250,000,000 |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  | 4.375% |  |  |  |  |  |  |  |
Borrowings, maturity |  |  |  |  |  |  | 2025 |  |  |  |  |  |  |  |
Percentage of bonds issue price |  |  |  |  |  |  | 99.41% |  |  |  |  |  |  |  |
Series C bonds [Member] | Bonds issued [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 101,918,000 | 3,000,000
Borrowings, interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.00% | 4.00%
Series H bonds [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current bonds issued net of issuance costs |  |  |  |  |  |  |  |  |  | $ 3,617,000 |  |  |  |  |
Non current bonds issued net of issuance costs |  |  |  |  |  |  |  |  |  |  | $ 172,835,000 |  |  |  |
Notional amount |  |  |  |  |  |  |  |  |  | $ 3,756,000 | $ 174,367,000 |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  |  |  | 190.00% | 4.90% |  |  |  |
Borrowings, maturity |  |  |  |  |  |  |  |  |  | 1/05/2019 | 01/05/2030 |  |  |  |
Series H bonds [Member] | Bonds issued [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  | $ 139,216,000 |  |  |  |  |  |  |  | 4,000,000 |  |
Borrowings, interest rate |  |  |  |  | 4.90% |  |  |  |  |  |  |  | 4.90% |  |
Borrowings, maturity |  |  |  |  | 21 |  |  |  |  |  |  |  |  |  |
Series Q bonds [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current bonds issued net of issuance costs |  |  |  |  |  |  |  |  |  | $ 342,000 |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  |  | $ 342,000 |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  | 3.45% |  |  |  | 334.00% |  |  |  |  |
Borrowings, maturity |  |  |  |  |  |  |  |  |  | 6/01/2019 |  |  |  |  |
Percentage Of Funds From Sale Of Financial Assets Used For Expansion | 90.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from disposal or maturity of available-for-sale financial assets | $ 83,567,623,842 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bond Authorised to Issue |  |  |  |  |  | $ 3,000,000 |  |  |  |  |  |  |  |  |
Series O bonds [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current bonds issued net of issuance costs |  |  |  |  |  |  |  |  |  | $ 867,000 |  |  |  |  |
Non current bonds issued net of issuance costs |  |  |  |  |  |  |  |  |  |  | $ 64,443,000 |  |  |  |
Notional amount |  |  |  |  |  |  |  |  |  | $ 934,000 | $ 65,388,000 |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  |  |  | 260.00% | 3.80% |  |  |  |
Borrowings, maturity |  |  |  |  |  |  |  |  |  | 2/01/2019 | 01/02/2033 |  |  |  |
Series O bonds [Member] | Bonds issued [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  | $ 69,901,000 |  |  |  |  |  |  |  | 1,500,000 |  |  |
Borrowings, interest rate |  |  |  | 3.80% |  |  |  |  |  |  |  | 3.80% |  |  |
Borrowings, maturity |  |  |  | 21 |  |  |  |  |  |  |  |  |  |  |
Series P bonds [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current bonds issued net of issuance costs |  |  |  |  |  |  |  |  |  | $ 1,772,000 |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  |  | $ 1,784,000 |  |  |  |  |
Borrowings, interest rate |  | 3.25% |  |  |  |  |  |  |  | 307.00% |  |  |  |  |
Borrowings, maturity |  | 2028 |  |  |  |  |  |  |  | 1/15/2019 |  |  |  |  |
Bond Authorised to Issue |  | $ 3,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Series M Bonds [Member] | Bonds issued [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  | $ 46,601,000 |  |  |  |  |  |  |  | 1,000,000 |  |  |
Borrowings, interest rate |  |  |  | 3.30% |  |  |  |  |  |  |  | 3.30% |  |  |
Borrowings, maturity |  |  |  | 5 |  |  |  |  |  |  |  |  |  |  |

X
- Definition The interest rate on borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_7&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The nominal or face amount of a financial instrument, used to calculate payments made on that instrument. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition Amount of bonds authorised to issue. + References No definition available. + Details
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- Definition The amount of current bonds issued after deducting issuance costs. + References No definition available. + Details
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- Definition The description of difference between the annual interest rate and comparable rate with treasury bonds + References No definition available. + Details
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- Definition The amount of non current bonds issued after deducting issuance costs. + References No definition available. + Details
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- Definition The amount of purchase orders outstanding. + References No definition available. + Details
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- Definition The percentage of bonds issue price with respect to capital. + References No definition available. + Details
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- Definition The percentage of funds from sale of financial assets used for expansion. + References No definition available. + Details
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- Definition The maturity of term deposits. + References No definition available. + Details
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