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Fair Values Of Financial Instruments - Disclosure Of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs Assets Explanatory (Detail) | 12 Months Ended
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Dec. 31, 2020 $ / shares | Dec. 31, 2020 $ / shares
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items] |  |
Put Option Fair Value Per Share | $ 130 |
Sensitivity Analysis Measurement Percentage | 100.00% | 100.00%
EBITDA Range One [Member] |  |
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items] |  |
Put Option Fair Value Per Share |  | $ 95
EBITDA Range Two [Member] |  |
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items] |  |
Put Option Fair Value Per Share |  | $ 100
Sensitivity Analysis Measurement Percentage | 100.00% | 100.00%
EBITDA Range Three [Member] |  |
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items] |  |
Put Option Fair Value Per Share |  | $ 105
WACC Range Two [Member] |  |
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items] |  |
Sensitivity Analysis Measurement Percentage | 100.00% | 100.00%
Range 1 [Member] |  |
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items] |  |
Sensitivity Analysis Measurement Percentage | 10.00% | 10.00%
Range 2 [Member] |  |
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items] |  |
Sensitivity Analysis Measurement Percentage | 12.00% | 12.00%
Range 3 [Member] |  |
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items] |  |
Sensitivity Analysis Measurement Percentage | 15.00% | 15.00%
Range 4 [Member] |  |
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items] |  |
Sensitivity Analysis Measurement Percentage | 20.00% | 20.00%
Historical volatility for shares, measurement input [member] | WACC Range One [Member] |  |
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items] |  |
Sensitivity Analysis Measurement Percentage | 97.50% | 97.50%
Historical volatility for shares, measurement input [member] | WACC Range Two [Member] |  |
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items] |  |
Sensitivity Analysis Measurement Percentage | 100.00% | 100.00%
Historical volatility for shares, measurement input [member] | WACC Range Three [Member] |  |
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items] |  |
Sensitivity Analysis Measurement Percentage | 102.50% | 102.50%
Historical volatility for shares, measurement input [member] | Range 1 [Member] |  |
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items] |  |
Put Option Fair Value Per Share |  | $ 10.0
Sensitivity Analysis Measurement Percentage | 2.00% | 2.00%
Historical volatility for shares, measurement input [member] | Range 1 [Member] | EBITDA Range One [Member] |  |
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items] |  |
Put Option Fair Value Per Share |  | $ 1.08
Historical volatility for shares, measurement input [member] | Range 1 [Member] | EBITDA Range Two [Member] |  |
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items] |  |
Put Option Fair Value Per Share |  | 1.26
Historical volatility for shares, measurement input [member] | Range 1 [Member] | EBITDA Range Three [Member] |  |
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items] |  |
Put Option Fair Value Per Share |  | $ 1.43
Historical volatility for shares, measurement input [member] | Range 1 [Member] | WACC Range One [Member] |  |
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items] |  |
Sensitivity Analysis Measurement Percentage | 52020.50% | 52020.50%
Historical volatility for shares, measurement input [member] | Range 1 [Member] | WACC Range Two [Member] |  |
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items] |  |
Sensitivity Analysis Measurement Percentage | 51368.30% | 51368.30%
Historical volatility for shares, measurement input [member] | Range 1 [Member] | WACC Range Three [Member] |  |
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items] |  |
Sensitivity Analysis Measurement Percentage | 50727.00% | 50727.00%
Historical volatility for shares, measurement input [member] | Range 2 [Member] |  |
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items] |  |
Put Option Fair Value Per Share |  | $ 12.0
Sensitivity Analysis Measurement Percentage | 3.00% | 3.00%
Historical volatility for shares, measurement input [member] | Range 2 [Member] | EBITDA Range One [Member] |  |
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items] |  |
Put Option Fair Value Per Share |  | $ 1.16
Historical volatility for shares, measurement input [member] | Range 2 [Member] | EBITDA Range Two [Member] |  |
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items] |  |
Put Option Fair Value Per Share |  | 1.30
Historical volatility for shares, measurement input [member] | Range 2 [Member] | EBITDA Range Three [Member] |  |
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items] |  |
Put Option Fair Value Per Share |  | $ 1.48
Historical volatility for shares, measurement input [member] | Range 2 [Member] | WACC Range One [Member] |  |
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items] |  |
Sensitivity Analysis Measurement Percentage | 54950.50% | 54950.50%
Historical volatility for shares, measurement input [member] | Range 2 [Member] | WACC Range Two [Member] |  |
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items] |  |
Sensitivity Analysis Measurement Percentage | 54252.60% | 54252.60%
Historical volatility for shares, measurement input [member] | Range 2 [Member] | WACC Range Three [Member] |  |
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items] |  |
Sensitivity Analysis Measurement Percentage | 53569.70% | 53569.70%
Historical volatility for shares, measurement input [member] | Range 3 [Member] |  |
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items] |  |
Put Option Fair Value Per Share |  | $ 15.0
Sensitivity Analysis Measurement Percentage | 4.00% | 4.00%
Historical volatility for shares, measurement input [member] | Range 3 [Member] | EBITDA Range One [Member] |  |
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items] |  |
Put Option Fair Value Per Share |  | $ 1.26
Historical volatility for shares, measurement input [member] | Range 3 [Member] | EBITDA Range Two [Member] |  |
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items] |  |
Put Option Fair Value Per Share |  | 1.42
Historical volatility for shares, measurement input [member] | Range 3 [Member] | EBITDA Range Three [Member] |  |
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items] |  |
Put Option Fair Value Per Share |  | $ 1.58
Historical volatility for shares, measurement input [member] | Range 3 [Member] | WACC Range One [Member] |  |
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items] |  |
Sensitivity Analysis Measurement Percentage | 58413.10% | 58413.10%
Historical volatility for shares, measurement input [member] | Range 3 [Member] | WACC Range Two [Member] |  |
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items] |  |
Sensitivity Analysis Measurement Percentage | 57664.80% | 57664.80%
Historical volatility for shares, measurement input [member] | Range 3 [Member] | WACC Range Three [Member] |  |
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items] |  |
Sensitivity Analysis Measurement Percentage | 56929.20% | 56929.20%
Historical volatility for shares, measurement input [member] | Range 4 [Member] |  |
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items] |  |
Put Option Fair Value Per Share |  | $ 20.0
Historical volatility for shares, measurement input [member] | Range 4 [Member] | EBITDA Range One [Member] |  |
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items] |  |
Put Option Fair Value Per Share |  | 1.42
Historical volatility for shares, measurement input [member] | Range 4 [Member] | EBITDA Range Two [Member] |  |
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items] |  |
Put Option Fair Value Per Share |  | 1.59
Historical volatility for shares, measurement input [member] | Range 4 [Member] | EBITDA Range Three [Member] |  |
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items] |  |
Put Option Fair Value Per Share |  | $ 1.75

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