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Provisions (Non-Current and Current) - Additional Information (Detail)
€ in Thousands
 1 Months Ended 12 Months Ended
May 31, 2017
Worker
Dec. 31, 2018
EUR (€)
Worker
Dec. 31, 2017
EUR (€)
Jan. 01, 2017
EUR (€)
Disclosure of other provisions [line items]        
Provision   € 18,978 € 22,672 € 18,940
Legal proceedings contingent liability [member]        
Disclosure of other provisions [line items]        
Liability due to legal procedure   9,287    
Provision for income tax [member]        
Disclosure of other provisions [line items]        
Provision   439 476  
Provision for taxes other than income tax [member]        
Disclosure of other provisions [line items]        
Provision   659 1,436  
Provision for legal claims [member]        
Disclosure of other provisions [line items]        
Provision   10,926 13,008 € 8,062
Liability due to legal procedure   € 9,287 € 9,300  
Number of workers initiated for legal procedure | Worker   141    
Number of workers adverse with adverse verdict in legal procedure | Worker 2