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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, 2017 USD ($) | Dec. 31, 2017 CAD ($) | Dec. 31, 2017 BRL (R$) | Dec. 31, 2017 EUR (€) | Dec. 31, 2017 AUD ($) | Dec. 31, 2017 GBP (£) | Dec. 31, 2017 RSD (дин) | Dec. 31, 2017 TRY (₺) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2017 RON ( ) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
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Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ 479,501 |  |  |  |  |  |  |  |  |  | $ 883,171 | $ 288,189
Marketable securities | 5,010 |  |  |  |  |  |  |  |  |  | 28,327 |
Accounts receivable and other | 78,344 |  |  |  |  |  |  |  |  |  | 54,315 |
Accounts payable and accrued liabilities | (110,651) |  |  |  |  |  |  |  |  |  | $ (90,705) |
Canadian dollar [member] | Currency risk [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ 18,280 |  |  |  |  |  |  |  |  |  |
Marketable securities |  | 6,286 |  |  |  |  |  |  |  |  |  |
Accounts receivable and other |  | 13,706 |  |  |  |  |  |  |  |  |  |
Accounts payable and accrued liabilities |  | (30,900) |  |  |  |  |  |  |  |  |  |
Other non-current liability |  | (1,269) |  |  |  |  |  |  |  |  |  |
Net balance | 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 |  |  |  |  | $ 482 |  |  |  |  |  |  |
Accounts receivable and other |  |  |  |  | 4 |  |  |  |  |  |  |
Accounts payable and accrued liabilities |  |  |  |  | (42) |  |  |  |  |  |  |
Net balance | 347 |  |  |  | $ 444 |  |  |  |  |  |  |
Euro [member] | Currency risk [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | € |  |  |  | € 13,030 |  |  |  |  |  |  |  |
Accounts receivable and other | € |  |  |  | 24,508 |  |  |  |  |  |  |  |
Accounts payable and accrued liabilities | € |  |  |  | (45,751) |  |  |  |  |  |  |  |
Other non-current liability | € |  |  |  | (6,516) |  |  |  |  |  |  |  |
Net balance | (17,664) |  |  | € (14,729) |  |  |  |  |  |  |  |
Turkish lira [member] | Currency risk [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | ₺ |  |  |  |  |  |  |  | ₺ 4,965 |  |  |  |
Accounts receivable and other | ₺ |  |  |  |  |  |  |  | 60,111 |  |  |  |
Accounts payable and accrued liabilities | ₺ |  |  |  |  |  |  |  | (50,099) |  |  |  |
Other non-current liability | ₺ |  |  |  |  |  |  |  | (17,999) |  |  |  |
Net balance | (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 | ¥ |  |  |  |  |  |  |  |  | ¥ 77 |  |  |
Net balance | 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 4,845 |  |  |  |  |
Accounts receivable and other | дин |  |  |  |  |  |  | 43,157 |  |  |  |  |
Accounts payable and accrued liabilities | дин |  |  |  |  |  |  | (9,000) |  |  |  |  |
Net balance | 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 | |  |  |  |  |  |  |  |  |  | 9,730 |  |
Accounts receivable and other | |  |  |  |  |  |  |  |  |  | 7,542 |  |
Accounts payable and accrued liabilities | |  |  |  |  |  |  |  |  |  | (6,174) |  |
Net balance | 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 | £ |  |  |  |  |  | £ 366 |  |  |  |  |  |
Net balance | 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$ 15,991 |  |  |  |  |  |  |  |  |
Accounts receivable and other | R$ |  |  | 12,547 |  |  |  |  |  |  |  |  |
Accounts payable and accrued liabilities | R$ |  |  | (5,559) |  |  |  |  |  |  |  |  |
Net balance | $ 6,946 |  | R$ 22,979 |  |  |  |  |  |  |  |  |

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