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Significant Accounting Policies - Estimated Useful Lives of the Group's Intangible Assets (Detail)
12 Months Ended
Dec. 31, 2022
Frequency usage rights [member] | Bottom of range [member]  
Disclosure of detailed information about intangible assets [line items]  
Useful lives (years) 2 years 4 months 24 days
Frequency usage rights [member] | Top of range [member]  
Disclosure of detailed information about intangible assets [line items]  
Useful lives (years) 10 years
Land usage rights [member]  
Disclosure of detailed information about intangible assets [line items]  
Useful lives (years) 5 years
Industrial rights [member] | Bottom of range [member]  
Disclosure of detailed information about intangible assets [line items]  
Useful lives (years) 5 years
Industrial rights [member] | Top of range [member]  
Disclosure of detailed information about intangible assets [line items]  
Useful lives (years) 10 years
Development costs [member]  
Disclosure of detailed information about intangible assets [line items]  
Useful lives (years) 5 years
Facility usage rights [member] | Bottom of range [member]  
Disclosure of detailed information about intangible assets [line items]  
Useful lives (years) 10 years
Facility usage rights [member] | Top of range [member]  
Disclosure of detailed information about intangible assets [line items]  
Useful lives (years) 20 years
Customer relations [member] | Bottom of range [member]  
Disclosure of detailed information about intangible assets [line items]  
Useful lives (years) 3 years
Customer relations [member] | Top of range [member]  
Disclosure of detailed information about intangible assets [line items]  
Useful lives (years) 15 years
Other [member] | Bottom of range [member]  
Disclosure of detailed information about intangible assets [line items]  
Useful lives (years) 3 years
Other [member] | Top of range [member]  
Disclosure of detailed information about intangible assets [line items]  
Useful lives (years) 20 years