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Provisions - Summary of Changes in Provisions (Detail) - KRW (₩) ₩ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Disclosure of other provisions [line items] |  |
Beginning balance | ₩ 197,179 | ₩ 195,272
Increase (transfer) | 48,219 | 57,338
Usage | (26,300) | (41,396)
Reversal | (16,024) | (14,035)
Change in scope of consolidation | (44) |
Ending balance | 203,030 | 197,179
Current | 78,172 | 96,485
Non-current | 124,858 | 100,694
Litigation [member] |  |
Disclosure of other provisions [line items] |  |
Beginning balance | 19,038 | 17,524
Increase (transfer) | 3,842 | 3,392
Usage | (1,740) | (640)
Reversal | (2,834) | (1,238)
Ending balance | 18,306 | 19,038
Current | 17,238 | 18,988
Non-current | 1,068 | 50
Restoration cost [member] |  |
Disclosure of other provisions [line items] |  |
Beginning balance | 101,312 | 91,827
Increase (transfer) | 2,827 | 13,653
Usage | (2,178) | (3,378)
Reversal | (1,723) | (790)
Change in scope of consolidation | (22) |
Ending balance | 100,216 | 101,312
Current | 1,766 | 2,334
Non-current | 98,450 | 98,978
Others [member] |  |
Disclosure of other provisions [line items] |  |
Beginning balance | 76,829 | 85,921
Increase (transfer) | 41,550 | 40,293
Usage | (22,382) | (37,378)
Reversal | (11,467) | (12,007)
Change in scope of consolidation | (22) |
Ending balance | 84,508 | 76,829
Current | 59,168 | 75,163
Non-current | ₩ 25,340 | ₩ 1,666

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- Definition The decrease in other provisions resulting from the loss of control of a subsidiary. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 37 -IssueDate 2017-01-01 -Paragraph 84 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2017-03-01&anchor=para_84&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The increase (decrease) in other provisions resulting from transfers and changes that the entity does not separately disclose in the same statement or note. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 37 -IssueDate 2017-01-01 -Paragraph 84 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2017-03-01&anchor=para_84&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of non-current provisions other than provisions for employee benefits. [Refer: Non-current provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 78 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_78_d&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of provisions other than provisions for employee benefits. [Refer: Provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2017-01-01 -Paragraph 84 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2017-03-01&anchor=para_84_a&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 78 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_78_d&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of current provisions other than provisions for employee benefits. [Refer: Provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 78 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_78_d&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount used (ie incurrent and charged against the provision) for other provisions. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2017-01-01 -Paragraph 84 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2017-03-01&anchor=para_84_c&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount reversed for unused other provisions. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2017-01-01 -Paragraph 84 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2017-03-01&anchor=para_84_d&doctype=Standard -URIDate 2017-03-09 + Details
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