v3.8.0.1

Basis of preparation (Details) $ in Thousands | Jun. 13, 2014 ConcessionalAsset | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
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Basis of preparation [Abstract] |  |  |  |
Number of selected assets subject to ROFO Agreement | ConcessionalAsset |  | 4 |  |
Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |  |
Contracted concessional assets |  |  | $ 9,100,548 | $ 9,084,270
Deferred tax assets |  |  | 173,371 | 165,136
Long-term project debt |  |  | 5,230,432 | 5,228,917
Grants and other liabilities |  |  | 1,676,199 | 1,636,060
Deferred tax liabilities |  |  | 201,274 | 186,583
Other Reserves |  |  |  | 80,968
Retained Earnings |  |  | (493,790) | (477,214)
Contracted concessional financial assets |  |  | $ 886,573 | 936,004
IFRS 9 Adjustments [Member] | Expected credit losses [Member] |  |  |  |
Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |  |
Contracted concessional assets | [1] |  |  | (53,048)
Deferred tax assets | [1] |  |  | 14,866
Retained Earnings | [1] |  |  | (38,182)
IFRS 9 Adjustments [Member] | Modification of financial liabilities [Member] |  |  |  |
Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |  |
Deferred tax assets |  |  |  | (3,055)
Long-term project debt |  |  |  | (39,599)
Deferred tax liabilities |  |  |  | 8,849
Retained Earnings |  |  |  | 27,695
IFRS 9 Adjustments [Member] | Hedge accounting [Member] |  |  |  |
Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |  |
Other Reserves |  |  |  | 1,326
Retained Earnings |  |  |  | (1,326)
IFRS 16 Adjustments [Member] |  |  |  |
Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |  |
Contracted concessional assets |  |  |  | 62,982
Grants and other liabilities |  |  |  | 62,982
Restated [Member] |  |  |  |
Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |  |
Contracted concessional assets |  |  |  | 9,094,204
Deferred tax assets |  |  |  | 176,947
Long-term project debt |  |  |  | 5,189,318
Grants and other liabilities |  |  |  | 1,699,042
Deferred tax liabilities |  |  |  | 195,432
Other Reserves |  |  |  | 82,294
Retained Earnings |  |  |  | $ (489,027)
[1] | The expected credit losses provision only applies to the concessional assets recorded as financial assets for an amount before provision of $936,004 thousand as of December 31, 2017 (see Note 6).

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