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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, 2019 $ / shares | Dec. 31, 2019 $ / shares
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items] |  |
Put Option Fair Value Per Share | $ 63.43 |
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 | 12.20% | 12.20%
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 | 2.50% | 2.50%
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 | $ 48.15 |
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 | (per share) | 54.88 | $ 0.95
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 | (per share) | $ 62.43 | $ 1.08
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 | 467.80% | 467.80%
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 | 461.80% | 461.80%
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 | 455.90% | 455.90%
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 | $ 12.2 |
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 | (per share) | $ 56.30 | $ 0.98
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 | (per share) | 63.43 | 1.10
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 | (per share) | $ 70.55 | $ 1.23
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 | 480.00% | 480.00%
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 | 473.80% | 473.80%
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 | 467.70% | 467.70%
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 | 3.50% | 3.50%
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 | (per share) | $ 66.51 | $ 1.16
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 | (per share) | 74.04 | 1.29
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 | (per share) | $ 81.58 | $ 1.42
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 | 493.30% | 493.30%
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 | 486.80% | 486.80%
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 | 480.50% | 480.50%
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 | (per share) | 83.47 | $ 1.45
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 | (per share) | 91.58 | 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 | (per share) | $ 99.70 | 1.73
EBITDA [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 |  | $ 0.84

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