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Provisions (Non-Current and Current) - Disclosure of Changes in Provision Related to Investment (Detail) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of other provisions [line items]    
Beginning Balance € 22,672 € 18,940
Increase 4,374 12,813
Reductions (8,068) (9,081)
Ending Balance 18,978 22,672
Provision for legal claims [member]    
Disclosure of other provisions [line items]    
Beginning Balance 13,008 8,062
Increase 1,225 9,980
Reductions (3,307) (5,034)
Ending Balance 10,926 13,008
Provision for tax claims [member]    
Disclosure of other provisions [line items]    
Beginning Balance 1,912 3,123
Reductions (814) (1,211)
Ending Balance 1,098 1,912
Provision for warranties [member]    
Disclosure of other provisions [line items]    
Beginning Balance 5,957 5,687
Increase 1,180 2,630
Reductions (2,661) (2,360)
Ending Balance 4,476 5,957
Termination indemnities for sales agents [member]    
Disclosure of other provisions [line items]    
Beginning Balance 1,196 1,132
Increase 177 203
Reductions (232) (139)
Ending Balance 1,141 1,196
Other provisions [member]    
Disclosure of other provisions [line items]    
Beginning Balance 599 936
Increase 1,792  
Reductions (1,054) (337)
Ending Balance € 1,337 € 599