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Impairment of Assets - Lifecell - Additional Information (Detail) - Lifecell [member]
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Actuarial assumption of weighted average cost of capital [member]    
Disclosure of detailed information about intangible assets [line items]    
Percentage of reasonably possible increase in actuarial assumption 0.50% 0.50%
Percentage of reasonably possible decrease in actuarial assumption (0.50%) (0.50%)
Individual assets or cash-generating units [member]    
Disclosure of detailed information about intangible assets [line items]    
Terminal growth rate 6.00% 6.00%
Description on key assumptions Post-tax WACC rate of 26.5% for the period from 2018 to 2022, a post-tax WACC rate of 25.9% for the period after 2022 and a terminal growth rate of 6.0% were used to extrapolate cash flows beyond the 6-year forecasts period based on the business plans. Post-tax WACC rate of 28.7% for the period from 2017 to 2021, a post-tax WACC rate of 27.9% for the period after 2021 and a terminal growth rate of 6.0% were used to extrapolate cash flows beyond the 5-year forecasts period based on the business plans
Pre-tax rate   30.00%
Individual assets or cash-generating units [member] | 2018 to 2022 [member]    
Disclosure of detailed information about intangible assets [line items]    
Post-tax WACC rate 26.50%  
Individual assets or cash-generating units [member] | After 2022 [member]    
Disclosure of detailed information about intangible assets [line items]    
Post-tax WACC rate 25.90%  
Individual assets or cash-generating units [member] | 2017 To 2021 [member]    
Disclosure of detailed information about intangible assets [line items]    
Post-tax WACC rate   28.70%
Individual assets or cash-generating units [member] | After 2021 [member]    
Disclosure of detailed information about intangible assets [line items]    
Post-tax WACC rate   27.90%