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Financial risk management - Summary of Exposure to Various Currencies Denominated in Foreign Currency (Detail) ₺ in Thousands, € in Thousands, дин in Thousands, ¥ in Thousands, £ in Thousands, R$ in Thousands, $ in Thousands, $ in Thousands, $ in Thousands, in Thousands | Dec. 31, 2018 EUR (€) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 BRL (R$) | Dec. 31, 2018 RON ( ) | Dec. 31, 2018 GBP (£) | Dec. 31, 2018 RSD (дин) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2018 AUD ($) | Dec. 31, 2018 TRY (₺) | Dec. 31, 2018 CAD ($) | Dec. 31, 2017 EUR (€) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 BRL (R$) | Dec. 31, 2017 RON ( ) | Dec. 31, 2017 GBP (£) | Dec. 31, 2017 RSD (дин) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2017 AUD ($) | Dec. 31, 2017 TRY (₺) | Dec. 31, 2017 CAD ($) | Dec. 31, 2016 USD ($)
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Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ 286,312 |  |  |  |  |  |  |  |  |  | $ 479,501 |  |  |  |  |  |  |  |  | $ 883,171
Marketable securities |  | 2,572 |  |  |  |  |  |  |  |  |  | 5,010 |  |  |  |  |  |  |  |  |
Accounts receivable and other |  | 80,987 |  |  |  |  |  |  |  |  |  | 78,344 |  |  |  |  |  |  |  |  |
Accounts payable and accrued liabilities |  | (140,878) |  |  |  |  |  |  |  |  |  | (110,541) |  |  |  |  |  |  |  |  |
Canadian dollar [member] | Currency risk [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  |  |  |  | $ 19,030 |  |  |  |  |  |  |  |  |  | $ 18,280 |
Marketable securities |  |  |  |  |  |  |  |  |  | 3,509 |  |  |  |  |  |  |  |  |  | 6,286 |
Accounts receivable and other |  |  |  |  |  |  |  |  |  | 23,672 |  |  |  |  |  |  |  |  |  | 13,706 |
Accounts payable and accrued liabilities |  |  |  |  |  |  |  |  |  | (102,027) |  |  |  |  |  |  |  |  |  | (30,900) |
Other non-current liability |  |  |  |  |  |  |  |  |  | (10,064) |  |  |  |  |  |  |  |  |  | (1,269) |
Net assets |  | (48,292) |  |  |  |  |  |  |  | $ (65,880) |  | 4,865 |  |  |  |  |  |  |  | $ 6,103 |
Australian dollar [member] | Currency risk [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  |  | $ 433 |  |  |  |  |  |  |  |  |  | $ 482 |  |  |
Accounts receivable and other |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  | 4 |  |  |
Accounts payable and accrued liabilities |  |  |  |  |  |  |  | (7) |  |  |  |  |  |  |  |  |  | (42) |  |  |
Net assets |  | 302 |  |  |  |  |  | $ 429 |  |  |  | 347 |  |  |  |  |  | $ 444 |  |  |
Euro [member] | Currency risk [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | € | € 6,861 |  |  |  |  |  |  |  |  |  | € 13,030 |  |  |  |  |  |  |  |  |  |
Accounts receivable and other | € | 15,552 |  |  |  |  |  |  |  |  |  | 24,508 |  |  |  |  |  |  |  |  |  |
Accounts payable and accrued liabilities | € | (34,488) |  |  |  |  |  |  |  |  |  | (45,751) |  |  |  |  |  |  |  |  |  |
Other non-current liability | € | (9,191) |  |  |  |  |  |  |  |  |  | (6,516) |  |  |  |  |  |  |  |  |  |
Net assets | € (21,266) | (24,334) |  |  |  |  |  |  |  |  | € (14,729) | (17,664) |  |  |  |  |  |  |  |  |
Turkish lira [member] | Currency risk [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | ₺ |  |  |  |  |  |  |  |  | ₺ 2,664 |  |  |  |  |  |  |  |  |  | ₺ 4,965 |  |
Accounts receivable and other | ₺ |  |  |  |  |  |  |  |  | 54,772 |  |  |  |  |  |  |  |  |  | 60,111 |  |
Accounts payable and accrued liabilities | ₺ |  |  |  |  |  |  |  |  | (44,516) |  |  |  |  |  |  |  |  |  | (50,099) |  |
Other non-current liability | ₺ |  |  |  |  |  |  |  |  | (15,877) |  |  |  |  |  |  |  |  |  | (17,999) |  |
Net assets |  | (562) |  |  |  |  |  |  | ₺ (2,957) |  |  | (802) |  |  |  |  |  |  | ₺ (3,022) |  |
Chinese renminbi [member] | Currency risk [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | ¥ |  |  |  |  |  |  | ¥ 72 |  |  |  |  |  |  |  |  |  | ¥ 77 |  |  |  |
Net assets |  | 11 |  |  |  |  | ¥ 72 |  |  |  |  | 12 |  |  |  |  | ¥ 77 |  |  |  |
Serbian Dinar [member] | Currency risk [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | дин |  |  |  |  |  | дин 8,848 |  |  |  |  |  |  |  |  |  | дин 4,845 |  |  |  |  |
Accounts receivable and other | дин |  |  |  |  |  | 8,386 |  |  |  |  |  |  |  |  |  | 43,157 |  |  |  |  |
Accounts payable and accrued liabilities | дин |  |  |  |  |  | (1,004) |  |  |  |  |  |  |  |  |  | (9,000) |  |  |  |  |
Net assets |  | 157 |  |  |  | дин 16,230 |  |  |  |  |  | 394 |  |  |  | дин 39,002 |  |  |  |  |
Romanian lei [member] | Currency risk [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | |  |  |  | 1,904 |  |  |  |  |  |  |  |  |  | 9,730 |  |  |  |  |  |  |
Accounts receivable and other | |  |  |  | 4,487 |  |  |  |  |  |  |  |  |  | 7,542 |  |  |  |  |  |  |
Accounts payable and accrued liabilities | |  |  |  | (2,286) |  |  |  |  |  |  |  |  |  | (6,174) |  |  |  |  |  |  |
Net assets |  | 1,010 |  | 4,105 |  |  |  |  |  |  |  | 2,874 |  | 11,098 |  |  |  |  |  |  |
Great British pound [member] | Currency risk [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | £ |  |  |  |  | £ 923 |  |  |  |  |  |  |  |  |  | £ 366 |  |  |  |  |  |
Net assets |  | 1,180 |  |  | £ 923 |  |  |  |  |  |  | 495 |  |  | £ 366 |  |  |  |  |  |
Brazilian real [member] | Currency risk [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | R$ |  |  | R$ 4,539 |  |  |  |  |  |  |  |  |  | R$ 15,991 |  |  |  |  |  |  |  |
Accounts receivable and other | R$ |  |  | 9,970 |  |  |  |  |  |  |  |  |  | 12,547 |  |  |  |  |  |  |  |
Accounts payable and accrued liabilities | R$ |  |  | (2,941) |  |  |  |  |  |  |  |  |  | (5,559) |  |  |  |  |  |  |  |
Net assets |  | $ 2,982 | R$ 11,568 |  |  |  |  |  |  |  |  | $ 6,946 | R$ 22,979 |  |  |  |  |  |  |  |

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- Definition The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2018-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_45&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2018-01-01 -Paragraph B13 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2018-03-01&anchor=para_B13_a&doctype=Appendix&seq=2 -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 54 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_54_i&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of current financial assets available-for-sale. [Refer: Financial assets available-for-sale; Current financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 8 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_8_d&doctype=Standard&book=b -URIDate 2018-03-16 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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