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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, P in Thousands, K in Thousands, FRw in Thousands, $ in Thousands, $ in Thousands, $ in Thousands, in Thousands, in Thousands, in Thousands, ₩ in Millions
Dec. 31, 2020
KRW (₩)
Dec. 31, 2020
TZS (Tsh)
Dec. 31, 2020
XAF ( )
Dec. 31, 2020
SGD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
XDR ( )
Dec. 31, 2020
JPY (¥)
Dec. 31, 2020
EUR (€)
Dec. 31, 2020
PLN (zł)
Dec. 31, 2020
VND (₫)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2020
RWF (FRw)
Dec. 31, 2020
THB (฿)
Dec. 31, 2020
BWP (P)
Dec. 31, 2020
HKD ($)
Dec. 31, 2019
KRW (₩)
Dec. 31, 2019
TZS (Tsh)
Dec. 31, 2019
XAF ( )
Dec. 31, 2019
USD ($)
Dec. 31, 2019
XDR ( )
Dec. 31, 2019
JPY (¥)
Dec. 31, 2019
EUR (€)
Dec. 31, 2019
BDT (৳)
Dec. 31, 2019
VND (₫)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2019
RWF (FRw)
Dec. 31, 2019
MMK (K)
Dec. 31, 2019
BWP (P)
Dec. 31, 2019
HKD ($)
Dec. 31, 2019
GBP (£)
Dec. 31, 2018
TZS (Tsh)
Dec. 31, 2018
XAF ( )
Dec. 31, 2018
USD ($)
Dec. 31, 2018
XDR ( )
Dec. 31, 2018
JPY (¥)
Dec. 31, 2018
EUR (€)
Dec. 31, 2018
BDT (৳)
Dec. 31, 2018
PLN (zł)
Dec. 31, 2018
VND (₫)
Dec. 31, 2018
DZD (دج)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2018
UZS ( )
Dec. 31, 2018
RWF (FRw)
Dec. 31, 2018
MMK (K)
Dec. 31, 2018
BWP (P)
Dec. 31, 2018
GBP (£)
Disclosure of detailed information about financial instruments [line items]                                                                                            
Financial assets ₩ 10,476,853                             ₩ 11,000,665                                                            
Financial liabilities ₩ 14,597,106                             ₩ 16,128,644                                                            
Currency risk [Member]                                                                                            
Disclosure of detailed information about financial instruments [line items]                                                                                            
Financial assets   Tsh 1,019 16,229 $ 6 $ 400,046 255 ¥ 209,376 € 316 zł 26 ₫ 242,370 ¥ 458 FRw 646 ฿ 535 P 212     Tsh 6,919 97,411 $ 645,941 255 ¥ 24,930 € 1 ৳ 18,897 ₫ 271,563 ¥ 457 FRw 706 K 84 P 911       666 $ 528,539 267 ¥ 66,078 € 2 ৳ 39,494 zł 26 ₫ 467,272 دج 618 ¥ 1,954 121,053 FRw 857 K 84 P 897  
Financial liabilities       $ 284,000 $ 1,937,935 728 ¥ 46,000,009 € 162     ¥ 491       $ 198       $ 1,830,764 729 ¥ 80,000,000 € 6     ¥ 161       $ 268 £ 56 Tsh 2,876   $ 1,893,849 730 ¥ 50,000,000 € 6         ¥ 171         £ 256