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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
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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%

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- Definition The expected volatility of the share price used to calculate the fair value of the share options granted. Expected volatility is a measure of the amount by which a price is expected to fluctuate during a period. The measure of volatility used in option pricing models is the annualised standard deviation of the continuously compounded rates of return on the share over a period of time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2022-03-24 -Paragraph 47 -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2022-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2022-03-24 + Details
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