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Financial Risk Management - Summary of Group's Recognized Financial Liabilities Subject to Enforceable Master Netting Arrangements or Similar Agreements (Detail) - KRW (₩) ₩ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of offsetting of financial liabilities [Line Items] |  |
Gross liabilities | ₩ 112,513 | ₩ 111,110
Gross assets offset | (5,446) | (4)
Net amounts presented in the statement of financial position | 107,067 | 111,106
Amounts not offset, Financial instruments | (81,700) | (106,811)
Amounts not offset, Cash collateral | 0 | 0
Net amount | 25,367 | 4,295
Derivatives used for hedging [Member] |  |
Disclosure of offsetting of financial liabilities [Line Items] |  |
Gross liabilities | 26,135 | 20,627
Net amounts presented in the statement of financial position | 26,135 | 20,627
Amounts not offset, Financial instruments | (3,284) | (20,627)
Amounts not offset, Cash collateral | 0 | 0
Net amount | 22,851 |
Trade payables [member] |  |
Disclosure of offsetting of financial liabilities [Line Items] |  |
Gross liabilities | 80,829 | 90,435
Gross assets offset | (5,217) |
Net amounts presented in the statement of financial position | 75,612 | 90,435
Amounts not offset, Financial instruments | (73,109) | (86,184)
Amounts not offset, Cash collateral | 0 | 0
Net amount | 2,503 | 4,251
Other payables [member] |  |
Disclosure of offsetting of financial liabilities [Line Items] |  |
Gross liabilities |  | 48
Gross assets offset |  | (4)
Net amounts presented in the statement of financial position |  | 44
Amounts not offset, Cash collateral |  | 0
Net amount |  | ₩ 44
Other [Member] |  |
Disclosure of offsetting of financial liabilities [Line Items] |  |
Gross liabilities | 5,549 |
Gross assets offset | (229) |
Net amounts presented in the statement of financial position | 5,320 |
Amounts not offset, Financial instruments | (5,307) |
Amounts not offset, Cash collateral | 0 |
Net amount | ₩ 13 |

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- Definition The amount of cash collateral pledged that is subject to an enforceable master netting arrangement or similar agreement and that is not set off against financial liabilities. [Refer: Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph IG40D -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_IG40D&doctype=Implementation%20Guidance -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 13C -Subparagraph d -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_13C_d_ii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of financial instruments subject to an enforceable master netting arrangement or similar agreement that are not set off against financial liabilities. [Refer: Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph IG40D -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_IG40D&doctype=Implementation%20Guidance -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 13C -Subparagraph d -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_13C_d_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of financial assets set off against financial liabilities when an entity: (a) currently has a legally enforceable right to set off the recognised amounts; and (b) intends either to settle on a net basis, or to realise the asset and settle the liability simultaneously. [Refer: Financial assets; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 13C -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_13C_b&doctype=Standard -URIDate 2017-03-09 + Details
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