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Loans and borrowings - Summary of Terms and Conditions of Outstanding Loans (Detail) - TRY (₺) ₺ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Disclosure of detailed information about borrowings [line items] |  |
Carrying amount | ₺ 12,536,149 | ₺ 9,781,162
Unsecured bank loans [member] | USD [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Currency | USD |
Interest rate type | Floating |
Nominal interest rate basis | Libor+2.0%-Libor+3.3% | Libor+2.0%-Libor+2.6%
Carrying amount | ₺ 2,880,615 | ₺ 1,984,533
Unsecured bank loans [member] | EUR [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Currency | EUR |
Interest rate type | Floating |
Nominal interest rate basis | Euribor+1.2%-Euribor+2.2% | Euribor+1.2%-Euribor+2.2%
Carrying amount | ₺ 5,511,579 | ₺ 3,593,110
Unsecured bank loans [member] | TL [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Currency | TL |
Interest rate type | Fixed |
Carrying amount | ₺ 1,620,391 | ₺ 1,819,944
Unsecured bank loans [member] | UAH [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Currency | UAH |
Interest rate type | Fixed |
Payment period | 2018 | 2017
Carrying amount | ₺ 520,933 | ₺ 407,171
Unsecured bank loans [member] | Bottom of range [member] | USD [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Payment period | 2018 | 2017
Unsecured bank loans [member] | Bottom of range [member] | EUR [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Payment period | 2018 | 2017
Unsecured bank loans [member] | Bottom of range [member] | TL [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Nominal interest rate | 11.10% | 10.40%
Payment period | 2018 | 2017
Unsecured bank loans [member] | Bottom of range [member] | UAH [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Nominal interest rate | 11.00% | 13.50%
Unsecured bank loans [member] | Bottom of range [member] | LIBOR [member] | USD [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Variable interest rate | 2.00% | 2.00%
Unsecured bank loans [member] | Bottom of range [member] | EURIBOR [member] | EUR [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Variable interest rate | 1.20% | 1.20%
Unsecured bank loans [member] | Top of range [member] | USD [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Payment period | 2020 | 2020
Unsecured bank loans [member] | Top of range [member] | EUR [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Payment period | 2026 | 2025
Unsecured bank loans [member] | Top of range [member] | TL [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Nominal interest rate | 15.50% | 12.60%
Payment period | 2019 | 2018
Unsecured bank loans [member] | Top of range [member] | UAH [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Nominal interest rate | 14.50% | 18.60%
Unsecured bank loans [member] | Top of range [member] | LIBOR [member] | USD [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Variable interest rate | 3.30% | 2.60%
Unsecured bank loans [member] | Top of range [member] | EURIBOR [member] | EUR [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Variable interest rate | 2.20% | 2.20%
Secured bank loans [member] | New Belarusian Ruble |  |
Disclosure of detailed information about borrowings [line items] |  |
Currency | BYN |
Interest rate type | Fixed |
Carrying amount | ₺ 4,390 | ₺ 5,634
Secured bank loans [member] | Bottom of range [member] | New Belarusian Ruble |  |
Disclosure of detailed information about borrowings [line items] |  |
Nominal interest rate | 12.00% | 12.00%
Payment period | 2018 | 2017
Secured bank loans [member] | Top of range [member] | New Belarusian Ruble |  |
Disclosure of detailed information about borrowings [line items] |  |
Nominal interest rate | 16.00% | 16.00%
Payment period | 2020 | 2020
Debt securities issued [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Carrying amount | ₺ 1,875,521 | ₺ 1,922,656
Debt securities issued [member] | USD [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Currency | USD |
Interest rate type | Fixed |
Nominal interest rate | 5.80% | 5.80%
Carrying amount | ₺ 1,875,521 | ₺ 1,683,700
Debt securities issued [member] | TL [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Currency | TL |
Interest rate type | Fixed |
Nominal interest rate |  | 10.70%
Payment period |  | 2017
Carrying amount |  | ₺ 238,956
Debt securities issued [member] | Bottom of range [member] | USD [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Payment period | 2018 | 2017
Debt securities issued [member] | Top of range [member] | USD [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Payment period | 2025 | 2025
Finance lease liabilities [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Carrying amount | ₺ 122,720 | ₺ 48,114
Finance lease liabilities [member] | USD [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Currency | USD |
Interest rate type | Fixed |
Nominal interest rate | 22.50% |
Payment period | 2018 |
Carrying amount | ₺ 41 | ₺ 80
Finance lease liabilities [member] | EUR [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Currency | EUR |
Interest rate type | Fixed |
Nominal interest rate | 3.40% | 3.40%
Carrying amount | ₺ 116,797 | ₺ 48,034
Finance lease liabilities [member] | TL [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Currency | TL |
Interest rate type | Fixed |
Carrying amount | ₺ 5,882 |
Finance lease liabilities [member] | Bottom of range [member] | USD [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Nominal interest rate |  | 18.00%
Payment period |  | 2017
Finance lease liabilities [member] | Bottom of range [member] | EUR [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Payment period | 2018 | 2017
Finance lease liabilities [member] | Bottom of range [member] | TL [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Nominal interest rate | 27.50% |
Payment period | 2018 |
Finance lease liabilities [member] | Top of range [member] | USD [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Nominal interest rate |  | 28.00%
Payment period |  | 2018
Finance lease liabilities [member] | Top of range [member] | EUR [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Payment period | 2024 | 2024
Finance lease liabilities [member] | Top of range [member] | TL [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Nominal interest rate | 27.70% |
Payment period | 2020 |

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