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Share-based Payment Expense - Summary of Assumptions of Fair Value Options (Detail)
12 Months Ended
Dec. 31, 2022
Rate
Dec. 31, 2022
€ / shares
Dec. 31, 2022
Dec. 31, 2022
EUR (€)
Dec. 31, 2022
yr
Dec. 31, 2021
EUR (€)
yr
€ / shares
Disclosure Of Share Based Compensation Expense [line items]            
Description of option Life share options granted | Rate 10          
2010 Savings related share option exercisable within six months after third anniversary of contract [member]            
Disclosure Of Share Based Compensation Expense [line items]            
Weighted average exercise price (in Euro per share) | € / shares   € 29.28       € 36.83
Risk free interest rate, share options granted     208.00%     (61.00%)
Expected dividend payments over the expected life (in Euro per share) | €       € 4.06   € 3.25
Expected volatility     2640.00%     2350.00%
Description of option Life share options granted 0.33       3 3
2010 Savings Related Share Option Exercisable Within Six Months After Fifth Anniversary of Contract            
Disclosure Of Share Based Compensation Expense [line items]            
Weighted average exercise price (in Euro per share) | € / shares   € 29.28       € 36.83
Risk free interest rate, share options granted     224.00%     (43.00%)
Expected dividend payments over the expected life (in Euro per share) | €       € 7.05   € 5.65
Expected volatility     2420.00%     2120.00%
Description of option Life share options granted 0.20       5 5