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Income Tax - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of income tax expense [line Items]      
Statutory income tax rate 24.10% 31.90% 24.90%
United States [member]      
Disclosure of income tax expense [line Items]      
Statutory income tax rate 26.00% 40.00% 40.00%
France [member]      
Disclosure of income tax expense [line Items]      
Statutory income tax rate 34.43% 39.20% 34.43%
Germany [member]      
Disclosure of income tax expense [line Items]      
Statutory income tax rate 29.00% 29.00% 29.00%
Netherlands [member]      
Disclosure of income tax expense [line Items]      
Statutory income tax rate 25.00% 25.00% 25.00%
Czech Republic [member]      
Disclosure of income tax expense [line Items]      
Statutory income tax rate 19.00% 19.00% 19.00%