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Significant Accounting Policies - Disclosure of Estimated Useful Lives for Intangible Asset (Detail)
 12 Months Ended
Dec. 31, 2019
Indefeasible right of use [member]  
Disclosure of detailed information about intangible assets [line items]  
Useful lives intangible assets 15 years
Bottom of range [member] | Transmission line software [member]  
Disclosure of detailed information about intangible assets [line items]  
Useful lives intangible assets 5 years
Bottom of range [member] | Central betting system operating right [member]  
Disclosure of detailed information about intangible assets [line items]  
Useful lives intangible assets 7 years
Bottom of range [member] | Customer base [member]  
Disclosure of detailed information about intangible assets [line items]  
Useful lives intangible assets 2 years
Bottom of range [member] | Brand name [member]  
Disclosure of detailed information about intangible assets [line items]  
Useful lives intangible assets 9 years
Bottom of range [member] | Telecommunication licenses [member]  
Disclosure of detailed information about intangible assets [line items]  
Useful lives intangible assets 3 years
Bottom of range [member] | Computer software [member]  
Disclosure of detailed information about intangible assets [line items]  
Useful lives intangible assets 3 years
Top of range [member] | Transmission line software [member]  
Disclosure of detailed information about intangible assets [line items]  
Useful lives intangible assets 10 years
Top of range [member] | Central betting system operating right [member]  
Disclosure of detailed information about intangible assets [line items]  
Useful lives intangible assets 10 years
Top of range [member] | Customer base [member]  
Disclosure of detailed information about intangible assets [line items]  
Useful lives intangible assets 15 years
Top of range [member] | Brand name [member]  
Disclosure of detailed information about intangible assets [line items]  
Useful lives intangible assets 10 years
Top of range [member] | Telecommunication licenses [member]  
Disclosure of detailed information about intangible assets [line items]  
Useful lives intangible assets 25 years
Top of range [member] | Computer software [member]  
Disclosure of detailed information about intangible assets [line items]  
Useful lives intangible assets 8 years