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Related Party Transactions - Summary of Transactions Prior Liquidation (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement [Line Items]      
Dividend Income     ₩ 11,146
Payables ₩ 20,857 ₩ 57,907  
K-Realty CR-REITs No.1 [member]      
Statement [Line Items]      
Dividend Income     8,932
Others [member]      
Statement [Line Items]      
Dividend Income     ₩ 2,148
Acquisition of right of use assets [member]      
Statement [Line Items]      
Dividend Income   776  
Acquisition of right of use assets [member] | K-Realty CR-REITs No.1 [member]      
Statement [Line Items]      
Dividend Income   776  
Finance costs [member] | K-Realty CR-REITs No.1 [member]      
Statement [Line Items]      
Payables   2,225  
Interest Expense [member]      
Statement [Line Items]      
Payables 917 2,225  
Interest Expense [member] | K-Realty CR-REITs No.1 [member]      
Statement [Line Items]      
Payables 917    
Dividend Income [member]      
Statement [Line Items]      
Payables 17,345 15,354  
Dividend Income [member] | K-Realty CR-REITs No.1 [member]      
Statement [Line Items]      
Payables 8,061 10,928  
Dividend Income [member] | Others [member]      
Statement [Line Items]      
Payables 43 146  
Dividend Income [member] | Korea Information & Technology Investment Fund (KIF Investment Fund) [member]      
Statement [Line Items]      
Payables 9,241 ₩ 4,280  
Interest income [member]      
Statement [Line Items]      
Dividend Income 14    
Interest income [member] | K Bank Inc. [member]      
Statement [Line Items]      
Dividend Income ₩ 14