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Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.","units":{"KRW":[{"end":"2016-12-31","val":-73138000,"accn":"0001493152-17-013686","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-21"},{"end":"2016-12-31","val":-73138000,"accn":"0001493152-18-005371","fy":2017,"fp":"FY","form":"10-K","filed":"2018-04-17","frame":"CY2016Q4I"},{"end":"2017-09-30","val":86006000,"accn":"0001493152-17-013686","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-21","frame":"CY2017Q3I"},{"end":"2017-12-31","val":-56593000,"accn":"0001493152-18-005371","fy":2017,"fp":"FY","form":"10-K","filed":"2018-04-17"},{"end":"2017-12-31","val":-56593000,"accn":"0001493152-18-006910","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-15"},{"end":"2017-12-31","val":-56593000,"accn":"0001493152-18-011617","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"end":"2017-12-31","val":-56593000,"accn":"0001493152-18-015902","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-14"},{"end":"2017-12-31","val":-56593000,"accn":"0001493152-19-005251","fy":2018,"fp":"FY","form":"10-K","filed":"2019-04-15","frame":"CY2017Q4I"},{"end":"2018-03-31","val":-44421000,"accn":"0001493152-18-006910","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-15","frame":"CY2018Q1I"},{"end":"2018-06-30","val":-64700000,"accn":"0001493152-18-011617","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2018Q2I"},{"end":"2018-09-30","val":-62833000,"accn":"0001493152-18-015902","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-14","frame":"CY2018Q3I"},{"end":"2018-12-31","val":-215614000,"accn":"0001493152-19-005251","fy":2018,"fp":"FY","form":"10-K","filed":"2019-04-15"},{"end":"2018-12-31","val":-215614000,"accn":"0001493152-19-007908","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-20"},{"end":"2018-12-31","val":-215614000,"accn":"0001493152-19-012569","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-14"},{"end":"2018-12-31","val":-215614000,"accn":"0001493152-19-017983","fy":2019,"fp":"Q3","form":"10-Q","filed":"2019-11-19"},{"end":"2018-12-31","val":-215614000,"accn":"0001493152-20-008709","fy":2019,"fp":"FY","form":"10-K","filed":"2020-05-14","frame":"CY2018Q4I"},{"end":"2019-03-31","val":-219159000,"accn":"0001493152-19-007908","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-20","frame":"CY2019Q1I"},{"end":"2019-06-30","val":-257957000,"accn":"0001493152-19-012569","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-14","frame":"CY2019Q2I"},{"end":"2019-09-30","val":-268314000,"accn":"0001493152-19-017983","fy":2019,"fp":"Q3","form":"10-Q","filed":"2019-11-19","frame":"CY2019Q3I"},{"end":"2019-12-31","val":-268314000,"accn":"0001493152-20-008709","fy":2019,"fp":"FY","form":"10-K","filed":"2020-05-14","frame":"CY2019Q4I"}]}},"AdditionalPaidInCapital":{"label":"Additional Paid in Capital","description":"Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. 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Includes only common stock transactions (excludes preferred stock transactions). 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