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Fair value and fair value hierarchy of financial instruments - Summary of Significant Unobservable Inputs to Valuation of Financial Instruments (Detail)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Unlisted Equity Investment Investment D    
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items]    
Valuation Technique   Multiple/EVA
Significant Unobservable input   Equity volatility
Range   75.29%
Sensitivity of Value to the input   5% increase/decrease in volatility results in decrease/increase in fair value by 0%/ 0%
Unlisted Equity Investment Investment E    
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items]    
Valuation Technique   Multiple/EVA
Significant Unobservable input   Equity volatility
Range   48.52%
Sensitivity of Value to the input   5% increase/decrease in volatility results in decrease/increase in fair value by 1.3%/1.3%
Unlisted Equity Investment Investment H    
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items]    
Valuation Technique Net asset value method Net asset value method
Significant Unobservable input Net asset value Net asset value
Sensitivity of Value to the input 5% increase/decrease in net asset value results in increase/decrease in fair value by 5.0%/5.0% 5% increase/decrease in net asset value results in increase/decrease in fair value by 5.0%/5.0%
Unlisted Equity Investment Investment I    
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items]    
Valuation Technique Multiple/EVA  
Significant Unobservable input Equity volatility  
Range 69.60%  
Sensitivity of Value to the input 5% increase/decrease in volatility results in decrease/increase in fair value by 0.0%/0.0%  
Derivative financial liability    
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items]    
Valuation Technique   Binomial option pricing model
Significant Unobservable input   Volatility
Range   46.21%
Sensitivity of Value to the input   5% increase/decrease in volatility results in increase/decrease in fair value by 0.07%/0.13%
Movie income right investments    
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items]    
Valuation Technique Income approach  
Significant Unobservable input Discount rate  
Sensitivity of Value to the input 5% increase/decrease in the discount rate results in decrease/increase in fair value by 5.0%/5.0%  
Derivative financial assets in relation to the Agreements    
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items]    
Valuation Technique MCS MCS
Significant Unobservable input Volatility of Underlying Assets Volatility of Underlying Assets
Range 49.78% 35.95%
Sensitivity of Value to the input 5% increase/decrease in volatility results in increase/decrease in fair value by 0.1%/0.1% 5% increase/decrease in volatility results in increase/decrease in fair value by 0.06%
Bottom of range [member] | Movie income right investments    
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items]    
Range 10.40%  
Top of range [member] | Movie income right investments    
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items]    
Range 12.59%  
Average PE multiple of peers [Member] | Unlisted Equity Investment Investment F    
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items]    
Valuation Technique   Multiple/EVA
Significant Unobservable input   Average P/E multiple of peers
Range   61.29%
Sensitivity of Value to the input   5% increase/decrease in P/E multiple results in increase/decrease in fair value by 5.0%/5.0%
Discount Rate [Member] | Derivative financial liability    
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items]    
Significant Unobservable input   Discount rate
Range   12.52%
Sensitivity of Value to the input   5% increase/decrease in discount rate results in decrease/increase in fair value by 0.70%/0.71%
Median Forward PE Multiple Of Peers [Member] | Unlisted Equity Investment Investment D    
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items]    
Significant Unobservable input   Median Forward P/E multiple of peers
Range   2.10%
Sensitivity of Value to the input   5% increase/decrease in P/E multiple results in increase/decrease in fair value by 0%/1.9%
Median Forward PE Multiple Of Peers [Member] | Unlisted Equity Investment Investment E    
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items]    
Significant Unobservable input   Median Forward P/E multiple of peers
Range   18.97%
Sensitivity of Value to the input   5% increase/decrease in P/E multiple results in increase/decrease in fair value by 4.2%/4.3%
Discount of lack of marketability [Member] | Unlisted Equity Investment Investment F    
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items]    
Significant Unobservable input   Discount of lack of marketability
Range   45.00%
Sensitivity of Value to the input   5% increase/decrease in discount of lack of marketability results in decrease/increase in fair value by 4.1%/4.1%