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Commissions and Expenses - Summary of Cumulative Number of Shares and Their Status in Relation to Active Long Term Incentive Plans and Allocated Variable Compensation to Identified Staff (Detail)
 12 Months Ended
Dec. 31, 2019
shares
€ / shares
Dec. 31, 2018
shares
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Beginning balance 22,548,724 18,585,551
Number of shares conditionally granted  
Number of shares allocated  
Number of shares conditionally granted 7,378,113 6,513,984
Number of shares allocated 621,373 916,988
Number of shares forfeited (549,647) (636,527)
Number of shares vested (5,797,262) (2,831,272)
Ending balance 24,201,301 22,548,724
2015 [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Beginning balance 2,380,167 4,314,494
Number of shares conditionally granted 5,178,633  
Number of shares allocated 4,942,275  
Number of shares forfeited (3,912) (102,383)
Number of shares vested (2,376,255) (1,831,944)
Ending balance   2,380,167
Average share price used for grant in EUR | € / shares € 6.106  
2015 [member] | Bottom of range [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Fair value of shares at grant date in EUR | € / shares 5.159  
2015 [member] | Top of range [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Fair value of shares at grant date in EUR | € / shares € 6.018  
2016 [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Beginning balance 6,243,971 6,591,429
Number of shares conditionally granted 6,809,814  
Number of shares allocated 7,155,420  
Number of shares allocated 22,580 11,471
Number of shares forfeited (44,746) (169,629)
Number of shares vested (2,530,968) (189,300)
Ending balance 3,690,837 6,243,971
Average share price used for grant in EUR | € / shares € 5.128  
2016 [member] | Bottom of range [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Fair value of shares at grant date in EUR | € / shares 3.990  
2016 [member] | Top of range [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Fair value of shares at grant date in EUR | € / shares € 4.898  
2017 [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Beginning balance 7,244,231 7,679,628
Number of shares conditionally granted 6,722,418  
Number of shares allocated 7,461,564  
Number of shares allocated 30,730 739,146
Number of shares forfeited (331,606) (364,515)
Number of shares vested (426,360) (810,028)
Ending balance 6,516,995 7,244,231
Average share price used for grant in EUR | € / shares € 5.246  
2017 [member] | Bottom of range [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Fair value of shares at grant date in EUR | € / shares 4.040  
2017 [member] | Top of range [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Fair value of shares at grant date in EUR | € / shares € 4.933  
2018 [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Beginning balance 6,680,355  
Number of shares conditionally granted 6,513,984  
Number of shares allocated 6,123,546  
Number of shares conditionally granted   6,513,984
Number of shares allocated 390,438 166,371
Number of shares forfeited (169,383)  
Number of shares vested (457,079)  
Ending balance 5,663,455 6,680,355
Average share price used for grant in EUR | € / shares € 5.405  
2018 [member] | Bottom of range [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Fair value of shares at grant date in EUR | € / shares 4.143  
2018 [member] | Top of range [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Fair value of shares at grant date in EUR | € / shares € 5.054  
2019 [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Number of shares conditionally granted 7,378,113  
Number of shares conditionally granted 7,378,113  
Number of shares allocated 958,501  
Number of shares vested (6,600)  
Ending balance 8,330,014  
Average share price used for grant in EUR | € / shares  
2019 [member] | Bottom of range [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Fair value of shares at grant date in EUR | € / shares 2.741  
2019 [member] | Top of range [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Fair value of shares at grant date in EUR | € / shares € 3.737