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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, 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 Millions
Dec. 31, 2017
KRW (₩)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
VND (₫)
Dec. 31, 2017
XDR ( )
Dec. 31, 2017
BDT (৳)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2017
EUR (€)
Dec. 31, 2017
GBP (£)
Dec. 31, 2017
JPY (¥)
Dec. 31, 2017
PLN (zł)
Dec. 31, 2017
UZS ( )
Dec. 31, 2017
RWF (FRw)
Dec. 31, 2017
TZS (Tsh)
Dec. 31, 2017
BWP (P)
Dec. 31, 2017
MMK (K)
Dec. 31, 2017
IDR (Rp)
Dec. 31, 2017
DZD (دج)
Dec. 31, 2017
CHF (SFr)
Dec. 31, 2016
KRW (₩)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
VND (₫)
Dec. 31, 2016
XDR ( )
Dec. 31, 2016
BDT (৳)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2016
EUR (€)
Dec. 31, 2016
HKD ($)
Dec. 31, 2016
GBP (£)
Dec. 31, 2016
JPY (¥)
Dec. 31, 2016
PLN (zł)
Dec. 31, 2016
UZS ( )
Dec. 31, 2016
RWF (FRw)
Dec. 31, 2016
TZS (Tsh)
Dec. 31, 2016
BWP (P)
Dec. 31, 2016
MMK (K)
Dec. 31, 2016
IDR (Rp)
Dec. 31, 2016
DZD (دج)
Dec. 31, 2015
USD ($)
Dec. 31, 2015
VND (₫)
Dec. 31, 2015
XDR ( )
Dec. 31, 2015
BDT (৳)
Dec. 31, 2015
CNY (¥)
Dec. 31, 2015
EUR (€)
Dec. 31, 2015
HKD ($)
Dec. 31, 2015
GBP (£)
Dec. 31, 2015
JPY (¥)
Dec. 31, 2015
PLN (zł)
Disclosure of detailed information about financial instruments [Line Items]                                                                                            
Financial assets ₩ 10,237,369                                   ₩ 10,216,182                                                      
Financial liabilities ₩ 15,295,656                                   ₩ 16,557,537                                                      
Currency risk [Member]                                                                                            
Disclosure of detailed information about financial instruments [Line Items]                                                                                            
Financial assets   $ 236,476 ₫ 311,649 306 ৳ 38,074 ¥ 46,555 € 186   ¥ 28,267 zł 338 136,787 FRw 3,346 Tsh 317,348 P 42 K 84 Rp 14,886,393 دج 47     $ 210,474 ₫ 515,412 311 ৳ 69,473 ¥ 15,262 € 40 $ 254 £ 1 ¥ 80,555 zł 106,025 39,531 FRw 1,203 Tsh 29,987 P 15 K 2,750 Rp 15,646,011 دج 471 $ 183,254 ₫ 270,000 444 ৳ 6 ¥ 15,562 € 29 $ 9 £ 8 ¥ 73,716 zł 207,273
Financial liabilities   $ 1,908,831   738   ¥ 10 € 3,625 £ 74 ¥ 21,801,443             Rp 710,162   SFr 12   $ 2,536,090   737   ¥ 381 € 2,571   £ 151 ¥ 21,802,051             Rp 53,142,167   $ 2,351,003   849   ¥ 107 € 29   £ 888 ¥ 40,279,411