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Financial assets and liabilities - Narrative (Details) ₩ in Billions |  |  |  | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
May 16, 2018 USD ($) | May 11, 2018 USD ($) | May 11, 2018 KRW (₩) | May 08, 2018 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | May 15, 2018 USD ($) | May 07, 2018 | Dec. 31, 2017 USD ($)
Subclassifications of assets, liabilities and equities [abstract] |  |  |  |  |  |  |  |  |  |
Derivative financial assets |  |  |  |  | $ 4,554,000 | $ 4,554,000 |  |  |  | $ 3,554,000
Non-current derivative financial assets |  |  |  |  | 570,000 | 570,000 |  |  |  | 2,647,000
Current derivative financial assets |  |  |  |  | 3,984,000 | 3,984,000 |  |  |  | 907,000
Derivative financial liabilities |  |  |  |  | 4,473,000 | 4,473,000 |  |  |  | 5,193,000
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Borrowings expected reduction to interest paid |  |  |  | $ 2,400,000 |  |  |  |  |  |
Cash receipts from termination of interest cap | $ 4,000,000 |  |  |  |  |  |  |  |  |
Amortisation of transaction costs |  |  |  |  | 1,700,000 | $ 2,119,000 | $ 2,437,000 |  |  |
Transaction costs capitalised |  |  |  |  | $ 700,000 |  |  |  |  |
US Denominated Credit Facility Term Loan |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Borrowings, adjustment to interest rate basis |  |  |  | 2.00% |  |  |  |  | 2.50% |
Borrowings decrease in interest rate |  |  |  | 0.50% |  |  |  |  |  |
Annual principal amount paid, percentage |  |  |  |  | 0.50% | 0.50% |  |  |  |
Borrowings |  |  |  |  | $ 286,669,000 | $ 286,669,000 |  |  |  | 288,426,000
EUR Denominated Credit Facility Term Loan |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Borrowings, adjustment to interest rate basis |  |  |  | 2.25% |  |  |  |  | 2.50% |
Borrowings decrease in interest rate |  |  |  | 0.25% |  |  |  |  |  |
Annual principal amount paid, percentage |  |  |  |  | 0.50% | 0.50% |  |  |  |
Borrowings |  |  |  |  | $ 382,450,000 | $ 382,450,000 |  |  |  | $ 395,808,000
KEB Hana Bank Term Loan Facility |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Repayments of non-current borrowings |  | $ 12,300,000 | ₩ 13.3 |  |  |  |  |  |  |
Cross Currency Swap Effective May 15, 2018 |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Borrowings expected reduction to interest paid |  | 4,700,000.0 |  |  |  |  |  |  |  |
Nominal amount of hedging instrument |  | $ 235,000,000 |  |  |  |  |  |  |  |
Cross Currency Swap Effective January 1, 2015 |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Nominal amount of hedging instrument |  |  |  |  | $ 180,000,000 | $ 180,000,000 |  |  |  |
Reserve for hedges of a net investment in foreign operation | Cross Currency Swap Effective January 1, 2015 |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Accumulated other comprehensive loss |  |  |  |  |  |  |  | $ 2,200,000 |  |

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