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Investment Properties - Summary of Investment Properties and Information About Fair Value Hierarchy (Detail) - TRY (₺) ₺ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of fair value measurement of assets [line items] |  |
Investment properties | ₺ 33,982,469 | ₺ 31,600,158
Level 3 [member] | Fair Value [Member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Investment properties | 109,338 | 418,373
Level 3 [member] | Fair Value [Member] | Investment properties in Izmir [member] | Replacement cost approach [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Investment properties | 52,110 | 42,315
Level 3 [member] | Fair Value [Member] | Investment properties in Gebze [member] | Income approach [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Investment properties | 16,690 | 12,558
Level 3 [member] | Fair Value [Member] | Investment properties in Ankara [member] | Market approach [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Investment properties | 15,160 |
Level 3 [member] | Fair Value [Member] | Investment properties in Istanbul [member] | Market approach [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Investment properties | 13,000 |
Level 3 [member] | Fair Value [Member] | Investment properties in adana [member] | Replacement cost approach [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Investment properties | 3,150 |
Level 3 [member] | Fair Value [Member] | Investment properties in Balikesir [member] | Replacement cost approach [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Investment properties | 3,112 |
Level 3 [member] | Fair Value [Member] | Other investment properties [member] | Replacement cost approach [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Investment properties | 3,970 | 8,946
Level 3 [member] | Fair Value [Member] | Other investment properties [member] | Market approach [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Investment properties | ₺ 2,146 | 17,419
Level 3 [member] | Fair Value [Member] | Other investment properties [member] | Direct capitalization [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Investment properties |  | 2,410
Level 3 [member] | Fair Value [Member] | Investment properties in Istanbul Tepebasi [member] | Direct capitalization [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Investment properties |  | 321,835
Level 3 [member] | Fair Value [Member] | Investment properties in Istanbul Kucukcekmece [member] | Replacement cost approach [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Investment properties |  | ₺ 12,890

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