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Financial Instruments - Fair Values and Risk Management - Summary of Changes in Liabilities Arising from Financing Activities (Detail) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance € 56,411 € 51,951 € 43,681
Cash flows   4,407 9,296
Changes in fair value   53 (1,026)
Ending balance   56,411 51,951
Long-term borrowings [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance 20,943 25,717 17,961
Cash flows (1,365) (4,774) 7,756
Other changes (1,166)    
Ending balance 18,412 20,943 25,717
Lease liabilities [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance 56,758    
Cash flows (11,960)    
Other changes 12,569    
Ending balance 57,367 56,758  
Bank Overdrafts and Short Term Borrowings [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance 35,148 25,967 24,427
Cash flows (10,978) 9,181 1,540
Ending balance 24,170 35,148 25,967
Losses on derivative financial instruments [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance 320 267 1,293
Changes in fair value 452 53 (1,026)
Ending balance 772 320 € 267
Adjusted balance due to lease liability [Member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance 113,169    
Cash flows (24,303)    
Changes in fair value 452    
Other changes 11,403    
Ending balance € 100,721 € 113,169