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Finance Income and Costs - Summary of Finance Income and Costs (Detail) - TRY (₺) ₺ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure Of Finance Income And Costs [abstract] |  |  |
Fair value gains on derivative financial instruments | ₺ 589,555 | ₺ 385,560 | ₺ 1,070
Interest income on bank deposits | 278,599 | 158,206 | 303,221
Interest income on financial assets measured at amortized cost | 185,004 | 445,943 | 436,024
Credit finance income | 36,186 | 74,522 | 13,865
Other | 1,105 | 563 | 1,859
Finance income | 1,090,449 | 1,064,794 | 756,039
Net foreign exchange losses | (718,501) | (782,463) | (489,320)
Interest expenses for financial liabilities measured at amortized cost | (385,386) | (343,290) | (224,724)
Interest expenses for derivative financial instruments | (244,841) | (93,038) |
Litigation late payment interest expense | (29,115) |  | (68,083)
Option premium charges | (27,172) | (10,114) | (2,290)
Other | (8,300) | (8,688) | (15,097)
Finance costs | (1,413,315) | (1,237,593) | (799,514)
Net finance costs | ₺ (322,866) | ₺ (172,799) | ₺ (43,475)

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- Definition The amount of income associated with interest and other financing activities of the entity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_85&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of finance income that the entity does not separately disclose in the same statement or note. [Refer: Finance income] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard -URIDate 2017-03-09 + Details
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