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Financial Risk Management - Summary of Details of Financial Assets and Liabilities in Foreign Currencies (Detail)
€ in Thousands, ₫ in Thousands, ฿ in Thousands, ৳ in Thousands, دج in Thousands, ¥ in Thousands, ¥ in Thousands, £ in Thousands, zł in Thousands, Tsh in Thousands, SFr in Thousands, Rp in Thousands, P in Thousands, K in Thousands, FRw in Thousands, $ in Thousands, $ in Thousands, in Thousands, in Thousands, in Thousands, ₩ in Millions
Dec. 31, 2019
KRW (₩)
Dec. 31, 2019
CHF (SFr)
Dec. 31, 2019
XAF ( )
Dec. 31, 2019
PLN (zł)
Dec. 31, 2019
VND (₫)
Dec. 31, 2019
MMK (K)
Dec. 31, 2019
TZS (Tsh)
Dec. 31, 2019
BWP (P)
Dec. 31, 2019
HKD ($)
Dec. 31, 2019
BDT (৳)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
XDR ( )
Dec. 31, 2019
JPY (¥)
Dec. 31, 2019
GBP (£)
Dec. 31, 2019
EUR (€)
Dec. 31, 2019
DZD (دج)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2019
UZS ( )
Dec. 31, 2019
RWF (FRw)
Dec. 31, 2019
THB (฿)
Dec. 31, 2019
IDR (Rp)
Dec. 31, 2018
KRW (₩)
Dec. 31, 2018
XAF ( )
Dec. 31, 2018
PLN (zł)
Dec. 31, 2018
VND (₫)
Dec. 31, 2018
MMK (K)
Dec. 31, 2018
TZS (Tsh)
Dec. 31, 2018
BWP (P)
Dec. 31, 2018
BDT (৳)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
XDR ( )
Dec. 31, 2018
JPY (¥)
Dec. 31, 2018
GBP (£)
Dec. 31, 2018
EUR (€)
Dec. 31, 2018
DZD (دج)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2018
UZS ( )
Dec. 31, 2018
RWF (FRw)
Dec. 31, 2018
THB (฿)
Dec. 31, 2018
IDR (Rp)
Dec. 31, 2017
CHF (SFr)
Dec. 31, 2017
PLN (zł)
Dec. 31, 2017
VND (₫)
Dec. 31, 2017
MMK (K)
Dec. 31, 2017
TZS (Tsh)
Dec. 31, 2017
BWP (P)
Dec. 31, 2017
BDT (৳)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
XDR ( )
Dec. 31, 2017
JPY (¥)
Dec. 31, 2017
GBP (£)
Dec. 31, 2017
EUR (€)
Dec. 31, 2017
DZD (دج)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2017
UZS ( )
Dec. 31, 2017
RWF (FRw)
Dec. 31, 2017
IDR (Rp)
Disclosure of detailed information about financial instruments [line items]                                                                                                                  
Financial assets ₩ 11,000,665                                         ₩ 10,844,722                                                                      
Financial liabilities ₩ 16,128,644                                         ₩ 15,170,209                                                                      
Currency risk [Member]                                                                                                                  
Disclosure of detailed information about financial instruments [line items]                                                                                                                  
Financial assets   SFr 0 97,411 zł 0 ₫ 271,563 K 84 Tsh 6,919 P 911 $ 0 ৳ 18,897 $ 209,163 255 ¥ 24,930 £ 0 € 1 دج 0 ¥ 2,438,626 0 FRw 706 ฿ 6,143 Rp 10,657,194   666 zł 26 ₫ 467,272 K 84   P 897 ৳ 39,494 $ 279,327 267 ¥ 66,078   € 2 دج 618 ¥ 16,315 121,053 FRw 857 ฿ 1,685 Rp 64,240,286   zł 338 ₫ 311,649 K 84 Tsh 317,348 P 42 ৳ 38,074 $ 236,476 306 ¥ 28,267   € 186 دج 47 ¥ 46,555 136,787 FRw 3,346 Rp 14,886,393
Financial liabilities   SFr 0 0 zł 0 ₫ 0 K 0 Tsh 0 P 0 $ 268 ৳ 0 $ 2,551,289 729 ¥ 80,000,000 £ 56 € 6 دج 0 ¥ 14,137 0 FRw 0 ฿ 3,079 Rp 2,034,151         K 0 Tsh 2,876     $ 1,893,782 730 ¥ 50,000,000 £ 256 € 6   ¥ 271     ฿ 1,685 Rp 41,510,330 SFr 12             $ 1,908,831 738 ¥ 21,801,443 £ 74 € 3,625   ¥ 10     Rp 710,162