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Derivative Financial Instruments - Details of Currency Forward Contracts (Detail) - Dec. 31, 2017 - Currency forward contracts [member] ₺ in Thousands | TRY (₺) | USD ($)
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Disclosure of detailed information about financial instruments [line items] |  |
Current Derivative Financial Instruments Liabilities, Fair Value | ₺ (2,246) |
30 January 2018 [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Current Derivative Financial Instruments Liabilities, Buy - Notional Amount | $ |  | $ 50,000,000
Current Derivative Financial Instruments Liabilities, Fair Value | ₺ (2,246) |

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