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Information on remuneration - Text Details (Detail)
12 Months Ended
Dec. 31, 2018
EUR (€)
Dec. 31, 2017
EUR (€)
Dec. 31, 2016
EUR (€)
Board of management [Member]      
Information on remuneration - Text Details (Detail) [Line Items]      
Key management personnel compensation € 9,848,153 € 7,808,117 € 8,904,859
Number of share options outstanding in share-based payment arrangement 333,670 333,670 476,200
Weighted average exercise price of share options outstanding in share-based payment arrangement € 18.99 € 18.99 € 19.47
Executive committee [Member]      
Information on remuneration - Text Details (Detail) [Line Items]      
Number of members 13 12 12
Key management personnel compensation € 26,755,003 € 25,848,741 € 22,433,827
Number of share options outstanding in share-based payment arrangement 333,670 541,400 750,631
Weighted average exercise price of share options outstanding in share-based payment arrangement € 18.99 € 19.82 € 21.17
Supervisory board [Member]      
Information on remuneration - Text Details (Detail) [Line Items]      
Key management personnel compensation 1,088,375 € 950,500 € 1,037,209
Other compensation, product arrangement entitlement € 2,000